TY  - JOUR
AU  - Spasojević, M.
AU  - Krstajić, Nedeljko V.
AU  - Spasojević, Pavle
AU  - Ribić-Zelenović, Lenka
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3015
AB  - A mathematical model was set up for anodic, cathodic and overall current efficiencies of an electrochemical cell for hypochlorite production acting as an ideal stirred reactor. A 0.06-0.20 mol dm(-3) NaClO hypochlorite solution was obtained in the cell by the electrolysis of 0.25-0.50 mol dm(-3) sodium chloride solution at a temperature of 20 degrees C, at a current density of 100 mA cm(-2) and at 8.3  lt  pH  lt  8.7. Anodic current losses occur through hypochlorite and water oxidation at the DSA anode, and cathodic current losses result from hypochlorite reduction at the titanium cathode. Theoretical dependences of the anodic current efficiency on the overall anodic current density, hypochlorite concentration and partial current density for water oxidation were established. Theoretically derived relations and the corresponding experimental results showed that oxygen evolution due to water and hypochlorite oxidation leads to reduced thickness of the anodic diffusion layer and increases the limiting diffusion current for hypochlorite oxidation. Mathematical models for the dependence of the cathodic current efficiency on the cathodic current density and hypochlorite concentration in the bulk solution were also established. The expression for the overall current efficiency of the electrochemical cell for hypochlorite production was derived on the basis of both the anodic and the cathodic current efficiency. The good agreement between experimental results and the values provided by the mathematical models has confirmed the correctness of the proposed models, suggesting that the model can be used to optimise electrolysis parameters. (The term hypochlorite is used to include both hypochlorite and undissociated hypochlorous acid.) The concentration of dissolved elementary chlorine in the slightly alkaline environment is negligible compared to hypochlorite concentration.
PB  - Elsevier, Amsterdam
T2  - Chemical Engineering Research & Design
T1  - Modelling current efficiency in an electrochemical hypochlorite reactor
EP  - 601
SP  - 591
VL  - 93
DO  - 10.1016/j.cherd.2014.07.025
ER  - 

@article{
author = "Spasojević, M. and Krstajić, Nedeljko V. and Spasojević, Pavle and Ribić-Zelenović, Lenka",
year = "2015",
abstract = "A mathematical model was set up for anodic, cathodic and overall current efficiencies of an electrochemical cell for hypochlorite production acting as an ideal stirred reactor. A 0.06-0.20 mol dm(-3) NaClO hypochlorite solution was obtained in the cell by the electrolysis of 0.25-0.50 mol dm(-3) sodium chloride solution at a temperature of 20 degrees C, at a current density of 100 mA cm(-2) and at 8.3  lt  pH  lt  8.7. Anodic current losses occur through hypochlorite and water oxidation at the DSA anode, and cathodic current losses result from hypochlorite reduction at the titanium cathode. Theoretical dependences of the anodic current efficiency on the overall anodic current density, hypochlorite concentration and partial current density for water oxidation were established. Theoretically derived relations and the corresponding experimental results showed that oxygen evolution due to water and hypochlorite oxidation leads to reduced thickness of the anodic diffusion layer and increases the limiting diffusion current for hypochlorite oxidation. Mathematical models for the dependence of the cathodic current efficiency on the cathodic current density and hypochlorite concentration in the bulk solution were also established. The expression for the overall current efficiency of the electrochemical cell for hypochlorite production was derived on the basis of both the anodic and the cathodic current efficiency. The good agreement between experimental results and the values provided by the mathematical models has confirmed the correctness of the proposed models, suggesting that the model can be used to optimise electrolysis parameters. (The term hypochlorite is used to include both hypochlorite and undissociated hypochlorous acid.) The concentration of dissolved elementary chlorine in the slightly alkaline environment is negligible compared to hypochlorite concentration.",
publisher = "Elsevier, Amsterdam",
journal = "Chemical Engineering Research & Design",
title = "Modelling current efficiency in an electrochemical hypochlorite reactor",
pages = "601-591",
volume = "93",
doi = "10.1016/j.cherd.2014.07.025"
}

Spasojević, M., Krstajić, N. V., Spasojević, P.,& Ribić-Zelenović, L.. (2015). Modelling current efficiency in an electrochemical hypochlorite reactor. in Chemical Engineering Research & Design
Elsevier, Amsterdam., 93, 591-601.
https://doi.org/10.1016/j.cherd.2014.07.025

Spasojević M, Krstajić NV, Spasojević P, Ribić-Zelenović L. Modelling current efficiency in an electrochemical hypochlorite reactor. in Chemical Engineering Research & Design. 2015;93:591-601.
doi:10.1016/j.cherd.2014.07.025 .

Spasojević, M., Krstajić, Nedeljko V., Spasojević, Pavle, Ribić-Zelenović, Lenka, "Modelling current efficiency in an electrochemical hypochlorite reactor" in Chemical Engineering Research & Design, 93 (2015):591-601,
https://doi.org/10.1016/j.cherd.2014.07.025 . .

TY  - JOUR
AU  - Cirović, N.
AU  - Spasojević, Pavle
AU  - Ribić-Zelenović, Lenka
AU  - Masković, Pavle
AU  - Spasojević, M.
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3002
AB  - Kinetic and operational electrolysis parameters determine the polarization characteristics, electrodeposition current efficiency, morphology, chemical composition and microstructure of nickel/iron/tungsten alloy deposits. The alloys electrodeposited at a current density of 50 mA cm(-2) to 1000 mA cm(-2) contain an amorphous phase and nanocrystals of an FCC solid solution of iron and tungsten in nickel. During annealing at temperatures above 500 degrees C, amorphous phase crystallization, crystalline grain growth of the FCC phase and a reduction in both internal microstrain and minimum density of chaotically distributed dislocations take place in the alloy. Milling the spongy deposit of the alloy causes amorphous phase crystallization, FCC-phase crystalline grain growth, and size reduction and rounding of powder particles.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Synthesis, Structure and Properties of Nickel-Iron-Tungsten Alloy Electrodeposits PART I: Effect of Synthesis Parameters on Chemical Composition, Microstructure and Morphology
EP  - 365
IS  - 3
SP  - 347
VL  - 47
DO  - 10.2298/SOS1503347C
ER  - 

@article{
author = "Cirović, N. and Spasojević, Pavle and Ribić-Zelenović, Lenka and Masković, Pavle and Spasojević, M.",
year = "2015",
abstract = "Kinetic and operational electrolysis parameters determine the polarization characteristics, electrodeposition current efficiency, morphology, chemical composition and microstructure of nickel/iron/tungsten alloy deposits. The alloys electrodeposited at a current density of 50 mA cm(-2) to 1000 mA cm(-2) contain an amorphous phase and nanocrystals of an FCC solid solution of iron and tungsten in nickel. During annealing at temperatures above 500 degrees C, amorphous phase crystallization, crystalline grain growth of the FCC phase and a reduction in both internal microstrain and minimum density of chaotically distributed dislocations take place in the alloy. Milling the spongy deposit of the alloy causes amorphous phase crystallization, FCC-phase crystalline grain growth, and size reduction and rounding of powder particles.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Synthesis, Structure and Properties of Nickel-Iron-Tungsten Alloy Electrodeposits PART I: Effect of Synthesis Parameters on Chemical Composition, Microstructure and Morphology",
pages = "365-347",
number = "3",
volume = "47",
doi = "10.2298/SOS1503347C"
}

Cirović, N., Spasojević, P., Ribić-Zelenović, L., Masković, P.,& Spasojević, M.. (2015). Synthesis, Structure and Properties of Nickel-Iron-Tungsten Alloy Electrodeposits PART I: Effect of Synthesis Parameters on Chemical Composition, Microstructure and Morphology. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 47(3), 347-365.
https://doi.org/10.2298/SOS1503347C

Cirović N, Spasojević P, Ribić-Zelenović L, Masković P, Spasojević M. Synthesis, Structure and Properties of Nickel-Iron-Tungsten Alloy Electrodeposits PART I: Effect of Synthesis Parameters on Chemical Composition, Microstructure and Morphology. in Science of Sintering. 2015;47(3):347-365.
doi:10.2298/SOS1503347C .

Cirović, N., Spasojević, Pavle, Ribić-Zelenović, Lenka, Masković, Pavle, Spasojević, M., "Synthesis, Structure and Properties of Nickel-Iron-Tungsten Alloy Electrodeposits PART I: Effect of Synthesis Parameters on Chemical Composition, Microstructure and Morphology" in Science of Sintering, 47, no. 3 (2015):347-365,
https://doi.org/10.2298/SOS1503347C . .

TY  - JOUR
AU  - Spasojević, M.
AU  - Ribić-Zelenović, Lenka
AU  - Maricić, A.
AU  - Spasojević, Pavle
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2846
AB  - A dark gray nanostructured coating of an alloy composed of 87.3 wt.% Ni, 11.3 wt.% Fe and 1.4 wt.% W (Ni87.3Fe11.3W1.4) was electrodeposited from an ammonia citrate bath on a titanium cathode at a current density of 500 mA cm(-2). A cathodic polarization curve was recorded and dependence of the current efficiency of alloy deposition on current density was determined. Partial polarization curves for alloy deposition and hydrogen evolution were also measured. Alloy deposition at current densities of up to 300 mA cm(-2) is an activation-controlled process which turns into a diffusion-controlled process at higher current densities. At potentials more positive than -960 mV, hydrogen is evolved from NH4+ and (HCit)(3-) ions (where (HCit)(3-) denotes triply deprotonated citric acid, C6H5O73-). At potentials more negative than -960 mV, hydrogen evolution from water is the dominating reaction. SEM images show that the surface of the deposit obtained at 500 mA cm(-2) has a globular structure containing a large number of craters, mostly located between the globules. XRD analysis revealed that the alloy contains an amorphous matrix with embedded nanocrystals of the FCC-structured solid solution of Fe and Win Ni with a mean particle size of 8.8 nm. The deposit has a high internal microstrain value and a high density of chaotically distributed dislocations. Heating and milling the alloy cause structural changes involving changes in the magnetic properties of the alloy. Structural relaxation takes place in the temperature interval of 80 degrees C to 420 degrees C. In this temperature range, magnetization of both as-deposited and milled alloy samples increases with increasing temperature, reaching maximum at a certain temperature, but decreases thereafter with further heating. During structural relaxation, short-term structural arrangement facilitates the expansion and orientation of magnetic domains, leading to increased magnetization of the alloy. The abrupt decline in magnetization at higher temperatures is the result of a heatinduced change in magnetic domain orientation. Annealing the alloy at temperatures above 420 degrees C causes amorphous phase crystallization and growth of crystal grains of the FCC-structured solid solution of Fe and W in Ni, as well as a simultaneous decrease in internal microstrain and mean density of chaotically distributed dislocations. The same structural changes, somewhat lower in intensity, are also caused by alloy milling. The new state of the microstructure achieved through annealing and milling is best illustrated by the mean crystal size. The increase in mean crystal size results in a shift of the Curie temperature towards lower temperatures, whereas magnetization increases at first, reaching maximum at a certain mean crystal size, but decreases, thereafter, with a further increase in mean crystal size.
PB  - Elsevier, Amsterdam
T2  - Powder Technology
T1  - Structure and magnetic properties of electrodeposited Ni87.3Fe11.3W1.4 alloy
EP  - 447
SP  - 439
VL  - 254
DO  - 10.1016/j.powtec.2014.01.017
ER  - 

@article{
author = "Spasojević, M. and Ribić-Zelenović, Lenka and Maricić, A. and Spasojević, Pavle",
year = "2014",
abstract = "A dark gray nanostructured coating of an alloy composed of 87.3 wt.% Ni, 11.3 wt.% Fe and 1.4 wt.% W (Ni87.3Fe11.3W1.4) was electrodeposited from an ammonia citrate bath on a titanium cathode at a current density of 500 mA cm(-2). A cathodic polarization curve was recorded and dependence of the current efficiency of alloy deposition on current density was determined. Partial polarization curves for alloy deposition and hydrogen evolution were also measured. Alloy deposition at current densities of up to 300 mA cm(-2) is an activation-controlled process which turns into a diffusion-controlled process at higher current densities. At potentials more positive than -960 mV, hydrogen is evolved from NH4+ and (HCit)(3-) ions (where (HCit)(3-) denotes triply deprotonated citric acid, C6H5O73-). At potentials more negative than -960 mV, hydrogen evolution from water is the dominating reaction. SEM images show that the surface of the deposit obtained at 500 mA cm(-2) has a globular structure containing a large number of craters, mostly located between the globules. XRD analysis revealed that the alloy contains an amorphous matrix with embedded nanocrystals of the FCC-structured solid solution of Fe and Win Ni with a mean particle size of 8.8 nm. The deposit has a high internal microstrain value and a high density of chaotically distributed dislocations. Heating and milling the alloy cause structural changes involving changes in the magnetic properties of the alloy. Structural relaxation takes place in the temperature interval of 80 degrees C to 420 degrees C. In this temperature range, magnetization of both as-deposited and milled alloy samples increases with increasing temperature, reaching maximum at a certain temperature, but decreases thereafter with further heating. During structural relaxation, short-term structural arrangement facilitates the expansion and orientation of magnetic domains, leading to increased magnetization of the alloy. The abrupt decline in magnetization at higher temperatures is the result of a heatinduced change in magnetic domain orientation. Annealing the alloy at temperatures above 420 degrees C causes amorphous phase crystallization and growth of crystal grains of the FCC-structured solid solution of Fe and W in Ni, as well as a simultaneous decrease in internal microstrain and mean density of chaotically distributed dislocations. The same structural changes, somewhat lower in intensity, are also caused by alloy milling. The new state of the microstructure achieved through annealing and milling is best illustrated by the mean crystal size. The increase in mean crystal size results in a shift of the Curie temperature towards lower temperatures, whereas magnetization increases at first, reaching maximum at a certain mean crystal size, but decreases, thereafter, with a further increase in mean crystal size.",
publisher = "Elsevier, Amsterdam",
journal = "Powder Technology",
title = "Structure and magnetic properties of electrodeposited Ni87.3Fe11.3W1.4 alloy",
pages = "447-439",
volume = "254",
doi = "10.1016/j.powtec.2014.01.017"
}

Spasojević, M., Ribić-Zelenović, L., Maricić, A.,& Spasojević, P.. (2014). Structure and magnetic properties of electrodeposited Ni87.3Fe11.3W1.4 alloy. in Powder Technology
Elsevier, Amsterdam., 254, 439-447.
https://doi.org/10.1016/j.powtec.2014.01.017

Spasojević M, Ribić-Zelenović L, Maricić A, Spasojević P. Structure and magnetic properties of electrodeposited Ni87.3Fe11.3W1.4 alloy. in Powder Technology. 2014;254:439-447.
doi:10.1016/j.powtec.2014.01.017 .

Spasojević, M., Ribić-Zelenović, Lenka, Maricić, A., Spasojević, Pavle, "Structure and magnetic properties of electrodeposited Ni87.3Fe11.3W1.4 alloy" in Powder Technology, 254 (2014):439-447,
https://doi.org/10.1016/j.powtec.2014.01.017 . .

TY  - JOUR
AU  - Vuković, Zorica M.
AU  - Spasojević, Pavle
AU  - Plazinić, M.
AU  - Zivanić, J.
AU  - Spasojević, M.
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2567
AB  - Ni-85,Ni-8 Fe-10,Fe-6 W-1,W-4 Cu-2,Cu-2 alloy powder consisting of an amorphous matrix and nanocrystals of an FCC solid solution of Fe, W and Cu in nickel was produced by electrodeposition. Heating the pressed powder sample over the temperature range of 20 to 600 degrees C permitted structural changes to take place in the alloy, causing changes in its electrical resistivity and magnetic permeability. The alloy exhibits structural stability up to 150 degrees C. In the temperature interval 150-360 degrees C, the alloy undergoes intensive structural relaxation resulting in an increase in electrical conductivity and magnetic permeability. Less intensive structural relaxation occurs at temperatures between 360 degrees C and 460 degrees C. In this interval, under heat treatment, magnetic domain arrangement decreases and, hence, the interaction between magnons and conduction electrons is reduced, leading to a decrease in the temperature coefficient of electrical resistivity (TCER). Amorphous matrix crystallization and FCC crystal growth take place in the temperature interval 460-520 degrees C, causing a decline in electrical resistivity and magnetic permeability.
PB  - Natl Inst Optoelectronics, Bucharest-Magurele
T2  - Journal of Optoelectronics and Advanced Materials
T1  - The effect of annealing temperatures on magnetic and electric properties of electrodeposited Ni85,3Fe10,6W1,4Cu2,2 alloy
EP  - 989
IS  - 7-8
SP  - 985
VL  - 16
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2567
ER  - 

@article{
author = "Vuković, Zorica M. and Spasojević, Pavle and Plazinić, M. and Zivanić, J. and Spasojević, M.",
year = "2014",
abstract = "Ni-85,Ni-8 Fe-10,Fe-6 W-1,W-4 Cu-2,Cu-2 alloy powder consisting of an amorphous matrix and nanocrystals of an FCC solid solution of Fe, W and Cu in nickel was produced by electrodeposition. Heating the pressed powder sample over the temperature range of 20 to 600 degrees C permitted structural changes to take place in the alloy, causing changes in its electrical resistivity and magnetic permeability. The alloy exhibits structural stability up to 150 degrees C. In the temperature interval 150-360 degrees C, the alloy undergoes intensive structural relaxation resulting in an increase in electrical conductivity and magnetic permeability. Less intensive structural relaxation occurs at temperatures between 360 degrees C and 460 degrees C. In this interval, under heat treatment, magnetic domain arrangement decreases and, hence, the interaction between magnons and conduction electrons is reduced, leading to a decrease in the temperature coefficient of electrical resistivity (TCER). Amorphous matrix crystallization and FCC crystal growth take place in the temperature interval 460-520 degrees C, causing a decline in electrical resistivity and magnetic permeability.",
publisher = "Natl Inst Optoelectronics, Bucharest-Magurele",
journal = "Journal of Optoelectronics and Advanced Materials",
title = "The effect of annealing temperatures on magnetic and electric properties of electrodeposited Ni85,3Fe10,6W1,4Cu2,2 alloy",
pages = "989-985",
number = "7-8",
volume = "16",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2567"
}

Vuković, Z. M., Spasojević, P., Plazinić, M., Zivanić, J.,& Spasojević, M.. (2014). The effect of annealing temperatures on magnetic and electric properties of electrodeposited Ni85,3Fe10,6W1,4Cu2,2 alloy. in Journal of Optoelectronics and Advanced Materials
Natl Inst Optoelectronics, Bucharest-Magurele., 16(7-8), 985-989.
https://hdl.handle.net/21.15107/rcub_technorep_2567

Vuković ZM, Spasojević P, Plazinić M, Zivanić J, Spasojević M. The effect of annealing temperatures on magnetic and electric properties of electrodeposited Ni85,3Fe10,6W1,4Cu2,2 alloy. in Journal of Optoelectronics and Advanced Materials. 2014;16(7-8):985-989.
https://hdl.handle.net/21.15107/rcub_technorep_2567 .

Vuković, Zorica M., Spasojević, Pavle, Plazinić, M., Zivanić, J., Spasojević, M., "The effect of annealing temperatures on magnetic and electric properties of electrodeposited Ni85,3Fe10,6W1,4Cu2,2 alloy" in Journal of Optoelectronics and Advanced Materials, 16, no. 7-8 (2014):985-989,
https://hdl.handle.net/21.15107/rcub_technorep_2567 .

TY  - JOUR
AU  - Spasojević, M.
AU  - Cirović, N.
AU  - Ribić-Zelenović, Lenka
AU  - Spasojević, Pavle
AU  - Maricić, A.
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2666
AB  - Nanostructured nickel-iron-tungsten alloy coatings were electrodeposited from an ammonia citrate bath on steel and copper substrates at current densities in the range of 50 to 300 mA cm(-2). The contents of iron and tungsten in the alloy increase and that of nickel decreases with increasing deposition current density. At current densities below 100 mA cm(-2), smooth shiny coatings with no cracks and craters are deposited. Higher current densities result in matte coatings developing cracks and craters. XRD analysis showed that the coatings contain nanocrystals of FCC structured solid solution of iron and tungsten in nickel embedded in an amorphous matrix. Increasing deposition current density leads to an increase in the amorphous phase content and a decrease in both the content and mean crystallite size of the FCC phase. The coatings with an increased amorphous phase content and a decreased mean FCC crystallite size exhibit lower magnetization and reduced hardness. During annealing at temperatures up to 400 degrees C, the alloy undergoes structural relaxation along with short-range structural arrangement, resulting in increased magnetization and hardness. At temperatures above 500 degrees C, annealing leads to amorphous phase crystallization and crystal grain growth in the FCC solid solution, thus leading to reduction in both magnetization and hardness.
PB  - Electrochemical Soc Inc, Pennington
T2  - Journal of the Electrochemical Society
T1  - Effect of Deposition Current Density and Annealing Temperature on the Microstructure, Hardness and Magnetic Properties of Nanostructured Nickel-Iron-Tungsten Alloys
EP  - D469
IS  - 10
SP  - D463
VL  - 161
DO  - 10.1149/2.0041410jes
ER  - 

@article{
author = "Spasojević, M. and Cirović, N. and Ribić-Zelenović, Lenka and Spasojević, Pavle and Maricić, A.",
year = "2014",
abstract = "Nanostructured nickel-iron-tungsten alloy coatings were electrodeposited from an ammonia citrate bath on steel and copper substrates at current densities in the range of 50 to 300 mA cm(-2). The contents of iron and tungsten in the alloy increase and that of nickel decreases with increasing deposition current density. At current densities below 100 mA cm(-2), smooth shiny coatings with no cracks and craters are deposited. Higher current densities result in matte coatings developing cracks and craters. XRD analysis showed that the coatings contain nanocrystals of FCC structured solid solution of iron and tungsten in nickel embedded in an amorphous matrix. Increasing deposition current density leads to an increase in the amorphous phase content and a decrease in both the content and mean crystallite size of the FCC phase. The coatings with an increased amorphous phase content and a decreased mean FCC crystallite size exhibit lower magnetization and reduced hardness. During annealing at temperatures up to 400 degrees C, the alloy undergoes structural relaxation along with short-range structural arrangement, resulting in increased magnetization and hardness. At temperatures above 500 degrees C, annealing leads to amorphous phase crystallization and crystal grain growth in the FCC solid solution, thus leading to reduction in both magnetization and hardness.",
publisher = "Electrochemical Soc Inc, Pennington",
journal = "Journal of the Electrochemical Society",
title = "Effect of Deposition Current Density and Annealing Temperature on the Microstructure, Hardness and Magnetic Properties of Nanostructured Nickel-Iron-Tungsten Alloys",
pages = "D469-D463",
number = "10",
volume = "161",
doi = "10.1149/2.0041410jes"
}

Spasojević, M., Cirović, N., Ribić-Zelenović, L., Spasojević, P.,& Maricić, A.. (2014). Effect of Deposition Current Density and Annealing Temperature on the Microstructure, Hardness and Magnetic Properties of Nanostructured Nickel-Iron-Tungsten Alloys. in Journal of the Electrochemical Society
Electrochemical Soc Inc, Pennington., 161(10), D463-D469.
https://doi.org/10.1149/2.0041410jes

Spasojević M, Cirović N, Ribić-Zelenović L, Spasojević P, Maricić A. Effect of Deposition Current Density and Annealing Temperature on the Microstructure, Hardness and Magnetic Properties of Nanostructured Nickel-Iron-Tungsten Alloys. in Journal of the Electrochemical Society. 2014;161(10):D463-D469.
doi:10.1149/2.0041410jes .

Spasojević, M., Cirović, N., Ribić-Zelenović, Lenka, Spasojević, Pavle, Maricić, A., "Effect of Deposition Current Density and Annealing Temperature on the Microstructure, Hardness and Magnetic Properties of Nanostructured Nickel-Iron-Tungsten Alloys" in Journal of the Electrochemical Society, 161, no. 10 (2014):D463-D469,
https://doi.org/10.1149/2.0041410jes . .

TY  - JOUR
AU  - Pesić, O.
AU  - Spasojević, M.
AU  - Jordović, Branka
AU  - Spasojević, Pavle
AU  - Maricić, A.
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2684
AB  - Nanostructured nickel-cobalt-molybdenum alloy powders were electrodeposited from an ammonium sulfate bath. The powders mostly consist of an amorphous phase and a very small amount of nanocrystals with an mean size of less than 3 nm. An increase in deposition current density increases the amorphous phase percentage, the density of chaotically distributed dislocations and internal microstrains in the powders, while decreasing the mean nanocrystal size. The temperature range over which the structural relaxation of the powders deposited at higher current densities occurs is shifted towards lower temperatures. A change in relative magnetic permeability during structural relaxation is higher in powders deposited at higher current densities. Powder crystallization takes place at temperatures above 700 degrees C. The formation of the stable crystal structure causes a decrease in relative magnetic permeability.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Effect of Electrodeposition Current Density on the Microstructure and Magnetic Properties of Nickel-cobalt-molybdenum Alloy Powders
EP  - 127
IS  - 1
SP  - 117
VL  - 46
DO  - 10.2298/SOS1401117P
ER  - 

@article{
author = "Pesić, O. and Spasojević, M. and Jordović, Branka and Spasojević, Pavle and Maricić, A.",
year = "2014",
abstract = "Nanostructured nickel-cobalt-molybdenum alloy powders were electrodeposited from an ammonium sulfate bath. The powders mostly consist of an amorphous phase and a very small amount of nanocrystals with an mean size of less than 3 nm. An increase in deposition current density increases the amorphous phase percentage, the density of chaotically distributed dislocations and internal microstrains in the powders, while decreasing the mean nanocrystal size. The temperature range over which the structural relaxation of the powders deposited at higher current densities occurs is shifted towards lower temperatures. A change in relative magnetic permeability during structural relaxation is higher in powders deposited at higher current densities. Powder crystallization takes place at temperatures above 700 degrees C. The formation of the stable crystal structure causes a decrease in relative magnetic permeability.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Effect of Electrodeposition Current Density on the Microstructure and Magnetic Properties of Nickel-cobalt-molybdenum Alloy Powders",
pages = "127-117",
number = "1",
volume = "46",
doi = "10.2298/SOS1401117P"
}

Pesić, O., Spasojević, M., Jordović, B., Spasojević, P.,& Maricić, A.. (2014). Effect of Electrodeposition Current Density on the Microstructure and Magnetic Properties of Nickel-cobalt-molybdenum Alloy Powders. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 46(1), 117-127.
https://doi.org/10.2298/SOS1401117P

Pesić O, Spasojević M, Jordović B, Spasojević P, Maricić A. Effect of Electrodeposition Current Density on the Microstructure and Magnetic Properties of Nickel-cobalt-molybdenum Alloy Powders. in Science of Sintering. 2014;46(1):117-127.
doi:10.2298/SOS1401117P .

Pesić, O., Spasojević, M., Jordović, Branka, Spasojević, Pavle, Maricić, A., "Effect of Electrodeposition Current Density on the Microstructure and Magnetic Properties of Nickel-cobalt-molybdenum Alloy Powders" in Science of Sintering, 46, no. 1 (2014):117-127,
https://doi.org/10.2298/SOS1401117P . .

TY  - JOUR
AU  - Spasojević, M.
AU  - Maricić, A.
AU  - Ribić-Zelenović, Lenka
AU  - Krstajić, Nedeljko V.
AU  - Spasojević, Pavle
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2522
AB  - Ni79.1Co18.6Cu2.3 powder was obtained by electrochemical deposition from an ammonium sulfate bath. The structure and surface morphology of the powder were detected by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The electrochemically obtained Ni79.1Co18.6Cu2.3 alloy contained an amorphous phase and nanocrystals with an average size of 6.8 nm of FCC phase of the solid solution of cobalt and copper in nickel. Nanocrystals were characterized by a high average microstrain value and high minimum density of chaotically distributed dislocations. X-ray analysis also showed that powder hydrogenation at an elevated temperature of up to 200 degrees C did not change unit cell parameters and mean crystallite size value. SEM images show the formation of two shapes of powder particles: large cauliflower-like particles and small dendritic ones. Powder pressing at 10 MPa and at 25 degrees C gave samples that were analyzed for hydrogen absorption/desorption within the temperature range of 160-200 degrees C. Changes in electrical resistivity during absorption/desorption were monitored. The reciprocal value of resistivity (electrical conductivity) was found to increase linearly with increasing amount of absorbed hydrogen. The experimental results were used to propose an absorption/desorption mechanism. The adsorbed hydrogen molecule dissociates on alloy surface, forming adsorbed atoms. Adatoms penetrate and diffuse into the bulk of the alloy, simultaneously donating their electrons to the conduction band of the alloy. The increase in the concentration of free electrons induces a decrease in electrical resistivity. The overall absorption rate during initial absorption is determined by the dissociation of adsorbed hydrogen molecules. At a later stage, the diffusion of H+ ions into the alloy bulk was found to be the rate determining step. The rate of the desorption reaction during the initial stage is governed by the recombination of adsorbed hydrogen atoms. Over time, H+ diffusion becomes the slowest step in the mechanism, hence determining the desorption rate.
PB  - Elsevier Science Sa, Lausanne
T2  - Journal of Alloys and Compounds
T1  - The kinetics of hydrogen absorption/desorption within nanostructured composite Ni79.1Co18.6Cu2.3 alloy using resistometry
EP  - 666
SP  - 660
VL  - 551
DO  - 10.1016/j.jallcom.2012.10.187
ER  - 

@article{
author = "Spasojević, M. and Maricić, A. and Ribić-Zelenović, Lenka and Krstajić, Nedeljko V. and Spasojević, Pavle",
year = "2013",
abstract = "Ni79.1Co18.6Cu2.3 powder was obtained by electrochemical deposition from an ammonium sulfate bath. The structure and surface morphology of the powder were detected by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The electrochemically obtained Ni79.1Co18.6Cu2.3 alloy contained an amorphous phase and nanocrystals with an average size of 6.8 nm of FCC phase of the solid solution of cobalt and copper in nickel. Nanocrystals were characterized by a high average microstrain value and high minimum density of chaotically distributed dislocations. X-ray analysis also showed that powder hydrogenation at an elevated temperature of up to 200 degrees C did not change unit cell parameters and mean crystallite size value. SEM images show the formation of two shapes of powder particles: large cauliflower-like particles and small dendritic ones. Powder pressing at 10 MPa and at 25 degrees C gave samples that were analyzed for hydrogen absorption/desorption within the temperature range of 160-200 degrees C. Changes in electrical resistivity during absorption/desorption were monitored. The reciprocal value of resistivity (electrical conductivity) was found to increase linearly with increasing amount of absorbed hydrogen. The experimental results were used to propose an absorption/desorption mechanism. The adsorbed hydrogen molecule dissociates on alloy surface, forming adsorbed atoms. Adatoms penetrate and diffuse into the bulk of the alloy, simultaneously donating their electrons to the conduction band of the alloy. The increase in the concentration of free electrons induces a decrease in electrical resistivity. The overall absorption rate during initial absorption is determined by the dissociation of adsorbed hydrogen molecules. At a later stage, the diffusion of H+ ions into the alloy bulk was found to be the rate determining step. The rate of the desorption reaction during the initial stage is governed by the recombination of adsorbed hydrogen atoms. Over time, H+ diffusion becomes the slowest step in the mechanism, hence determining the desorption rate.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Journal of Alloys and Compounds",
title = "The kinetics of hydrogen absorption/desorption within nanostructured composite Ni79.1Co18.6Cu2.3 alloy using resistometry",
pages = "666-660",
volume = "551",
doi = "10.1016/j.jallcom.2012.10.187"
}

Spasojević, M., Maricić, A., Ribić-Zelenović, L., Krstajić, N. V.,& Spasojević, P.. (2013). The kinetics of hydrogen absorption/desorption within nanostructured composite Ni79.1Co18.6Cu2.3 alloy using resistometry. in Journal of Alloys and Compounds
Elsevier Science Sa, Lausanne., 551, 660-666.
https://doi.org/10.1016/j.jallcom.2012.10.187

Spasojević M, Maricić A, Ribić-Zelenović L, Krstajić NV, Spasojević P. The kinetics of hydrogen absorption/desorption within nanostructured composite Ni79.1Co18.6Cu2.3 alloy using resistometry. in Journal of Alloys and Compounds. 2013;551:660-666.
doi:10.1016/j.jallcom.2012.10.187 .

Spasojević, M., Maricić, A., Ribić-Zelenović, Lenka, Krstajić, Nedeljko V., Spasojević, Pavle, "The kinetics of hydrogen absorption/desorption within nanostructured composite Ni79.1Co18.6Cu2.3 alloy using resistometry" in Journal of Alloys and Compounds, 551 (2013):660-666,
https://doi.org/10.1016/j.jallcom.2012.10.187 . .

TY  - JOUR
AU  - Spasojević, M.
AU  - Ribić-Zelenović, Lenka
AU  - Spasojević, Pavle
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2104
AB  - The first layer of active coating made from a rutile-structured solid solution of ruthenium and titanium dioxides having an average crystal grain size of 30 nm was thermally deposited on an adequately prepared titanium metal substrate. Then, at a temperature of 500 degrees C, the second layer was formed on the first layer from a mixture of amorphous particles of metallic platinum and rutile-structured iridium dioxide nanocrystals having an average crystal grain size of 26 nm. Rutile phase nanocrystals are characterized by a high density of chaotically distributed dislocations and high internal microstrain values. The coatings exhibit a compact granular morphology without cracks on the surface. Their catalytic activity is similar to that of conventional DSAs for the anodic oxidation of chloride ions from both concentrated and dilute sodium chloride solutions. The anodic current efficiency both during chlorate formation and active chlorine production was several percentage points higher in electrolyzers containing these anodes than in those containing DSAs. The catalytic activity of anodes having these coatings is about 50 mV lower than that of DSAs and about 350 mV higher than that of lead/antimony alloy electrodes, for oxygen evolution from acid sulfate solutions (0.5 mol dm(-3) H2SO4) characteristic of processes for the production of some metals. An accelerated corrosion test showed that the stability of the double-layer anodes is about twelve-fold higher than that of conventional DSAs.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Microstructure of new composite electrocatalyst and its anodic behavior for chlorine and oxygen evolution
EP  - 5833
IS  - 7
SP  - 5827
VL  - 38
DO  - 10.1016/j.ceramint.2012.04.032
ER  - 

@article{
author = "Spasojević, M. and Ribić-Zelenović, Lenka and Spasojević, Pavle",
year = "2012",
abstract = "The first layer of active coating made from a rutile-structured solid solution of ruthenium and titanium dioxides having an average crystal grain size of 30 nm was thermally deposited on an adequately prepared titanium metal substrate. Then, at a temperature of 500 degrees C, the second layer was formed on the first layer from a mixture of amorphous particles of metallic platinum and rutile-structured iridium dioxide nanocrystals having an average crystal grain size of 26 nm. Rutile phase nanocrystals are characterized by a high density of chaotically distributed dislocations and high internal microstrain values. The coatings exhibit a compact granular morphology without cracks on the surface. Their catalytic activity is similar to that of conventional DSAs for the anodic oxidation of chloride ions from both concentrated and dilute sodium chloride solutions. The anodic current efficiency both during chlorate formation and active chlorine production was several percentage points higher in electrolyzers containing these anodes than in those containing DSAs. The catalytic activity of anodes having these coatings is about 50 mV lower than that of DSAs and about 350 mV higher than that of lead/antimony alloy electrodes, for oxygen evolution from acid sulfate solutions (0.5 mol dm(-3) H2SO4) characteristic of processes for the production of some metals. An accelerated corrosion test showed that the stability of the double-layer anodes is about twelve-fold higher than that of conventional DSAs.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Microstructure of new composite electrocatalyst and its anodic behavior for chlorine and oxygen evolution",
pages = "5833-5827",
number = "7",
volume = "38",
doi = "10.1016/j.ceramint.2012.04.032"
}

Spasojević, M., Ribić-Zelenović, L.,& Spasojević, P.. (2012). Microstructure of new composite electrocatalyst and its anodic behavior for chlorine and oxygen evolution. in Ceramics International
Elsevier Sci Ltd, Oxford., 38(7), 5827-5833.
https://doi.org/10.1016/j.ceramint.2012.04.032

Spasojević M, Ribić-Zelenović L, Spasojević P. Microstructure of new composite electrocatalyst and its anodic behavior for chlorine and oxygen evolution. in Ceramics International. 2012;38(7):5827-5833.
doi:10.1016/j.ceramint.2012.04.032 .

Spasojević, M., Ribić-Zelenović, Lenka, Spasojević, Pavle, "Microstructure of new composite electrocatalyst and its anodic behavior for chlorine and oxygen evolution" in Ceramics International, 38, no. 7 (2012):5827-5833,
https://doi.org/10.1016/j.ceramint.2012.04.032 . .

TY  - JOUR
AU  - Spasojević, M.
AU  - Ribić-Zelenović, Lenka
AU  - Ćirović, N.
AU  - Spasojević, Pavle
AU  - Maričić, A.
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2045
AB  - A nanostructured Ni-11.3Fe-1.4W alloy deposit was obtained from an ammonium citrate bath at a current density of 600 mAcm-2. XRD analysis shows that the deposit contains an amorphous matrix having embedded nanocrystals of the FCC phase of the solid solution of Fe and W in Ni with the average crystal grain size of 8.8 nm. The deposit has a high internal microstrain value and a high minimum density of chaotically distributed dislocations. The effect of milling and annealing of the Ni-11.3Fe-1.4W alloy on electrical and magnetic properties was studied. Structural changes in the alloy take place during both annealing and milling. Upon deposition, the alloy was heated to 420ºC. Heating resulted in structural relaxation which induced a decrease in electrical resistivity and an increase in magnetic permeability of the alloy. Further heating of the alloy at temperatures higher than 4200C led to crystallization which caused a reduction in both electrical resistivity and magnetic permeability. The milling of the alloy for up to 12 hours caused a certain degree of structural relaxation and crystallization of the alloy. The increase in crystal grain size up to 11 nm and the partial structural relaxation induced a decrease in electrical resistivity and an increase in magnetic permeability of the alloy. Heating the powders obtained by milling at 4200C led to complete structural relaxation, reduced electrical resistivity, and increased magnetic permeability. During heating of the powders obtained by milling at temperatures above 420ºC, crystallization and a significant increase in crystal grain size occurred, leading to a reduction in both electrical resistivity and magnetic permeability. The best magnetic properties were exhibited by the alloys milled for 12 hours and annealed thereafter at 420ºC. In these alloys, crystal grains were found to have an optimum size, and complete relaxation took place, resulting in a maximum increase in magnetic permeability.
AB  - Nanostrukturni depozit legure Ni-11,3Fe-1,4W dobijen je elektrodepozicijom iz amonijačno-citratnog kupatila na gustini struje 600 mAcm-2. XRD analiza je pokazala da se depozit sastoji od amorfne matrice u kojoj su smešteni nanokristali FCC faze čvrstog rastvora Fe i W u Ni čije su prosečne dimenzije 8,8 nm. Proučavan je uticaj mlevenja i odgrevanja legure Ni-11,3Fe-1,4W na električna i magnetna svojstva. Strukturne promene legure se odigravaju i tokom odgrevanja i tokom mlevenja. Odmah nakon deponovanja legura je zagrevana do 420ºC. Tokom zagrevanja došlo je do procesa strukturne relaksacije koja je uzrokovala smanjenje električne otpornosti i povećanje magnetne permeabilnosti legure. Daljim zagrevanjem legure na temperaturama višim od 4200C odvija se proces kristalizacije koji dovodi do smanjenja i električne otpornosti i magnetne permeabilnosti. Mlevenjem legure do 12 časova u leguri se u izvesnoj meri odvijaju i proces strukturne relaksacije i proces kristalizacije. Porast kristalnih zrna do 11 nm i delimična strukturna relaksacija uzrokuju smanjenje električne otpornosti i povećanje magnetne permeabilnosti legure. Zagrevanjem prahova dobijenih mlevenjem do 4200C dolazi do potpune strukturne relaksacije, smanjenja električne otpornosti i povećanje magnetne permeabilnosti. Tokom zagrevanja prahova dobijenih mlevenjem na temperaturama višim od 420ºC dolazi do kristalizacije i značajnog porasta veličine kristalnih zrna, a to dovodi do smanjenja i električne otpornosti i magnetne permeabilnosti. Najbolja magnetna svojstva imaju legure mlevene 12 časova, a zatim odgrejane na 420ºC. U ovim legurama kristalna zrna imaju optimalnu veličinu, a proces relaksacije se potpuno odigrao, što uzrokuje maksimalan porast magnetne permeabilnosti.
PB  - International Institute for the Science of Sintering, Beograd
T2  - Science of Sintering
T1  - Effect of milling and annealing on microstructural, electrical and magnetic properties of electrodeposited Ni-11.3 Fe-1.4w alloy
EP  - 210
IS  - 2
SP  - 197
VL  - 44
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2045
ER  - 

@article{
author = "Spasojević, M. and Ribić-Zelenović, Lenka and Ćirović, N. and Spasojević, Pavle and Maričić, A.",
year = "2012",
abstract = "A nanostructured Ni-11.3Fe-1.4W alloy deposit was obtained from an ammonium citrate bath at a current density of 600 mAcm-2. XRD analysis shows that the deposit contains an amorphous matrix having embedded nanocrystals of the FCC phase of the solid solution of Fe and W in Ni with the average crystal grain size of 8.8 nm. The deposit has a high internal microstrain value and a high minimum density of chaotically distributed dislocations. The effect of milling and annealing of the Ni-11.3Fe-1.4W alloy on electrical and magnetic properties was studied. Structural changes in the alloy take place during both annealing and milling. Upon deposition, the alloy was heated to 420ºC. Heating resulted in structural relaxation which induced a decrease in electrical resistivity and an increase in magnetic permeability of the alloy. Further heating of the alloy at temperatures higher than 4200C led to crystallization which caused a reduction in both electrical resistivity and magnetic permeability. The milling of the alloy for up to 12 hours caused a certain degree of structural relaxation and crystallization of the alloy. The increase in crystal grain size up to 11 nm and the partial structural relaxation induced a decrease in electrical resistivity and an increase in magnetic permeability of the alloy. Heating the powders obtained by milling at 4200C led to complete structural relaxation, reduced electrical resistivity, and increased magnetic permeability. During heating of the powders obtained by milling at temperatures above 420ºC, crystallization and a significant increase in crystal grain size occurred, leading to a reduction in both electrical resistivity and magnetic permeability. The best magnetic properties were exhibited by the alloys milled for 12 hours and annealed thereafter at 420ºC. In these alloys, crystal grains were found to have an optimum size, and complete relaxation took place, resulting in a maximum increase in magnetic permeability., Nanostrukturni depozit legure Ni-11,3Fe-1,4W dobijen je elektrodepozicijom iz amonijačno-citratnog kupatila na gustini struje 600 mAcm-2. XRD analiza je pokazala da se depozit sastoji od amorfne matrice u kojoj su smešteni nanokristali FCC faze čvrstog rastvora Fe i W u Ni čije su prosečne dimenzije 8,8 nm. Proučavan je uticaj mlevenja i odgrevanja legure Ni-11,3Fe-1,4W na električna i magnetna svojstva. Strukturne promene legure se odigravaju i tokom odgrevanja i tokom mlevenja. Odmah nakon deponovanja legura je zagrevana do 420ºC. Tokom zagrevanja došlo je do procesa strukturne relaksacije koja je uzrokovala smanjenje električne otpornosti i povećanje magnetne permeabilnosti legure. Daljim zagrevanjem legure na temperaturama višim od 4200C odvija se proces kristalizacije koji dovodi do smanjenja i električne otpornosti i magnetne permeabilnosti. Mlevenjem legure do 12 časova u leguri se u izvesnoj meri odvijaju i proces strukturne relaksacije i proces kristalizacije. Porast kristalnih zrna do 11 nm i delimična strukturna relaksacija uzrokuju smanjenje električne otpornosti i povećanje magnetne permeabilnosti legure. Zagrevanjem prahova dobijenih mlevenjem do 4200C dolazi do potpune strukturne relaksacije, smanjenja električne otpornosti i povećanje magnetne permeabilnosti. Tokom zagrevanja prahova dobijenih mlevenjem na temperaturama višim od 420ºC dolazi do kristalizacije i značajnog porasta veličine kristalnih zrna, a to dovodi do smanjenja i električne otpornosti i magnetne permeabilnosti. Najbolja magnetna svojstva imaju legure mlevene 12 časova, a zatim odgrejane na 420ºC. U ovim legurama kristalna zrna imaju optimalnu veličinu, a proces relaksacije se potpuno odigrao, što uzrokuje maksimalan porast magnetne permeabilnosti.",
publisher = "International Institute for the Science of Sintering, Beograd",
journal = "Science of Sintering",
title = "Effect of milling and annealing on microstructural, electrical and magnetic properties of electrodeposited Ni-11.3 Fe-1.4w alloy",
pages = "210-197",
number = "2",
volume = "44",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2045"
}

Spasojević, M., Ribić-Zelenović, L., Ćirović, N., Spasojević, P.,& Maričić, A.. (2012). Effect of milling and annealing on microstructural, electrical and magnetic properties of electrodeposited Ni-11.3 Fe-1.4w alloy. in Science of Sintering
International Institute for the Science of Sintering, Beograd., 44(2), 197-210.
https://hdl.handle.net/21.15107/rcub_technorep_2045

Spasojević M, Ribić-Zelenović L, Ćirović N, Spasojević P, Maričić A. Effect of milling and annealing on microstructural, electrical and magnetic properties of electrodeposited Ni-11.3 Fe-1.4w alloy. in Science of Sintering. 2012;44(2):197-210.
https://hdl.handle.net/21.15107/rcub_technorep_2045 .

Spasojević, M., Ribić-Zelenović, Lenka, Ćirović, N., Spasojević, Pavle, Maričić, A., "Effect of milling and annealing on microstructural, electrical and magnetic properties of electrodeposited Ni-11.3 Fe-1.4w alloy" in Science of Sintering, 44, no. 2 (2012):197-210,
https://hdl.handle.net/21.15107/rcub_technorep_2045 .