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Structure and magnetic properties of electrodeposited Ni87.3Fe11.3W1.4 alloy

Authorized Users Only
2014
Authors
Spasojević, M.
Ribić-Zelenović, Lenka
Maricić, A.
Spasojević, Pavle
Article (Published version)
Metadata
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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 con...taining 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.

Keywords:
X-ray diffraction / Nanostructured materials / Grain growth / Dislocations
Source:
Powder Technology, 2014, 254, 439-447
Publisher:
  • Elsevier, Amsterdam
Funding / projects:
  • Directed synthesis, structure and properties of multifunctional materials (RS-172057)
  • Synthesis and characterization of novel functional polymers and polymeric nanocomposites (RS-172062)

DOI: 10.1016/j.powtec.2014.01.017

ISSN: 0032-5910

WoS: 000333883800052

Scopus: 2-s2.0-84896732627
[ Google Scholar ]
13
12
URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2846
Collections
  • Radovi istraživača (Inovacioni centar) / Researchers’ publications (Innovation Centre)
Institution/Community
Inovacioni centar
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 . .

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