TY  - CONF
AU  - Radovanović, Željko
AU  - Kazuz, Abdul Moneim Mohamed
AU  - Vulić, Predrag
AU  - Radovanović, Lidija
AU  - Veljović, Đorđe
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6701
AB  - The biomaterial powders of hydroxyapatite (HAp)
and fluorapatite (FAp) were synthesized by a hydrothermal
method. Powders were analyzed by energy-dispersive X-ray
spectroscopy (EDS), field emission scanning electron microscopy
(FESEM), and X-ray powder diffraction analysis (XRPD). EDS
analysis shows the presence of non-stoichiometries FAp and HAp
with molar ratio CA/P < 1.67. FESEM analysis of both powders
indicates the presence of agglomerates of micrometric dimensions,
while primary nanoparticles are rod-like. The Rietveld
refinement of XRPD data showed that the single phase powders of
FAp and HAp were synthesized. The results showed that obtained
nanomaterials can be potentially applied in dentistry.
PB  - Belgrade : ETRAN Society
PB  - Belgrade : Academic Mind
C3  - Proceedings of Papers / (Ic)ETRAN 2019, 6th International Conference on Electrical, Electronic and Computing Engineering in conjunction with ETRAN, 63rd National Conference on Electrical, Electronic and Computing Engineering, Silver Lake, Serbia, June 03 - 06, 2019
T1  - Sinthesis and Characterization of Hydroxyapatite and Fluorapatite Powders
EP  - 679
SP  - 676
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6701
ER  - 

@conference{
author = "Radovanović, Željko and Kazuz, Abdul Moneim Mohamed and Vulić, Predrag and Radovanović, Lidija and Veljović, Đorđe and Petrović, Rada and Janaćković, Đorđe",
year = "2019",
abstract = "The biomaterial powders of hydroxyapatite (HAp)
and fluorapatite (FAp) were synthesized by a hydrothermal
method. Powders were analyzed by energy-dispersive X-ray
spectroscopy (EDS), field emission scanning electron microscopy
(FESEM), and X-ray powder diffraction analysis (XRPD). EDS
analysis shows the presence of non-stoichiometries FAp and HAp
with molar ratio CA/P < 1.67. FESEM analysis of both powders
indicates the presence of agglomerates of micrometric dimensions,
while primary nanoparticles are rod-like. The Rietveld
refinement of XRPD data showed that the single phase powders of
FAp and HAp were synthesized. The results showed that obtained
nanomaterials can be potentially applied in dentistry.",
publisher = "Belgrade : ETRAN Society, Belgrade : Academic Mind",
journal = "Proceedings of Papers / (Ic)ETRAN 2019, 6th International Conference on Electrical, Electronic and Computing Engineering in conjunction with ETRAN, 63rd National Conference on Electrical, Electronic and Computing Engineering, Silver Lake, Serbia, June 03 - 06, 2019",
title = "Sinthesis and Characterization of Hydroxyapatite and Fluorapatite Powders",
pages = "679-676",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6701"
}

Radovanović, Ž., Kazuz, A. M. M., Vulić, P., Radovanović, L., Veljović, Đ., Petrović, R.,& Janaćković, Đ.. (2019). Sinthesis and Characterization of Hydroxyapatite and Fluorapatite Powders. in Proceedings of Papers / (Ic)ETRAN 2019, 6th International Conference on Electrical, Electronic and Computing Engineering in conjunction with ETRAN, 63rd National Conference on Electrical, Electronic and Computing Engineering, Silver Lake, Serbia, June 03 - 06, 2019
Belgrade : ETRAN Society., 676-679.
https://hdl.handle.net/21.15107/rcub_technorep_6701

Radovanović Ž, Kazuz AMM, Vulić P, Radovanović L, Veljović Đ, Petrović R, Janaćković Đ. Sinthesis and Characterization of Hydroxyapatite and Fluorapatite Powders. in Proceedings of Papers / (Ic)ETRAN 2019, 6th International Conference on Electrical, Electronic and Computing Engineering in conjunction with ETRAN, 63rd National Conference on Electrical, Electronic and Computing Engineering, Silver Lake, Serbia, June 03 - 06, 2019. 2019;:676-679.
https://hdl.handle.net/21.15107/rcub_technorep_6701 .

Radovanović, Željko, Kazuz, Abdul Moneim Mohamed, Vulić, Predrag, Radovanović, Lidija, Veljović, Đorđe, Petrović, Rada, Janaćković, Đorđe, "Sinthesis and Characterization of Hydroxyapatite and Fluorapatite Powders" in Proceedings of Papers / (Ic)ETRAN 2019, 6th International Conference on Electrical, Electronic and Computing Engineering in conjunction with ETRAN, 63rd National Conference on Electrical, Electronic and Computing Engineering, Silver Lake, Serbia, June 03 - 06, 2019 (2019):676-679,
https://hdl.handle.net/21.15107/rcub_technorep_6701 .

TY  - CONF
AU  - Radovanović, Lidija
AU  - Vulić, Predrag
AU  - Radovanović, Željko
AU  - Rogan, Jelena
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6721
AB  - Development of nanomaterials such as transition metal oxides with spinel
structure has been intensively examined because of their applications in catalysis,
energy storage, magnetic data storage and sensors [1]. Synthesis of these materials
has been realized by various approaches, such as hydrothermal synthesis, solid state
reactions and microwave synthesis [1]. In previous years, thermolysis of transition
metal complexes as precursors provides a new technique in preparing useful
nanomaterials due to the possibility to control their particle size and morphology [2].
The nano- and microparticles of Co3O4 have been prepared by direct calcination
of ternary Co(II) complex, [Co3(bipym)3(H3mell)2]·18H2O, where bipym is
2,2’-bipyrimidine and H3mell3–
is anion of 1,2,3,4,5,6-benzenehexacarboxylic
(mellitic) acid at 450 and 1000 °C in air atmosphere. The powder X-ray diffraction
(XRDP) and scanning electron microscopy (SEM) were used to investigate structure
and morphology of the obtained materials. The results indicated the formation of
pure Co3O4 phase, whose particles size depends on the calcination temperature.
PB  - Belgrade : Institute for Multidisciplinary Research, University
C3  - Programme and the Book of Abstracts / 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia
T1  - Preparation Co3O4 nano- and microparticles by solid state thermolysis of cobalt(II) complex
SP  - 92
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6721
ER  - 

@conference{
author = "Radovanović, Lidija and Vulić, Predrag and Radovanović, Željko and Rogan, Jelena",
year = "2019",
abstract = "Development of nanomaterials such as transition metal oxides with spinel
structure has been intensively examined because of their applications in catalysis,
energy storage, magnetic data storage and sensors [1]. Synthesis of these materials
has been realized by various approaches, such as hydrothermal synthesis, solid state
reactions and microwave synthesis [1]. In previous years, thermolysis of transition
metal complexes as precursors provides a new technique in preparing useful
nanomaterials due to the possibility to control their particle size and morphology [2].
The nano- and microparticles of Co3O4 have been prepared by direct calcination
of ternary Co(II) complex, [Co3(bipym)3(H3mell)2]·18H2O, where bipym is
2,2’-bipyrimidine and H3mell3–
is anion of 1,2,3,4,5,6-benzenehexacarboxylic
(mellitic) acid at 450 and 1000 °C in air atmosphere. The powder X-ray diffraction
(XRDP) and scanning electron microscopy (SEM) were used to investigate structure
and morphology of the obtained materials. The results indicated the formation of
pure Co3O4 phase, whose particles size depends on the calcination temperature.",
publisher = "Belgrade : Institute for Multidisciplinary Research, University",
journal = "Programme and the Book of Abstracts / 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia",
title = "Preparation Co3O4 nano- and microparticles by solid state thermolysis of cobalt(II) complex",
pages = "92",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6721"
}

Radovanović, L., Vulić, P., Radovanović, Ž.,& Rogan, J.. (2019). Preparation Co3O4 nano- and microparticles by solid state thermolysis of cobalt(II) complex. in Programme and the Book of Abstracts / 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia
Belgrade : Institute for Multidisciplinary Research, University., 92.
https://hdl.handle.net/21.15107/rcub_technorep_6721

Radovanović L, Vulić P, Radovanović Ž, Rogan J. Preparation Co3O4 nano- and microparticles by solid state thermolysis of cobalt(II) complex. in Programme and the Book of Abstracts / 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia. 2019;:92.
https://hdl.handle.net/21.15107/rcub_technorep_6721 .

Radovanović, Lidija, Vulić, Predrag, Radovanović, Željko, Rogan, Jelena, "Preparation Co3O4 nano- and microparticles by solid state thermolysis of cobalt(II) complex" in Programme and the Book of Abstracts / 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia (2019):92,
https://hdl.handle.net/21.15107/rcub_technorep_6721 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Filipović, Suzana
AU  - Corlett, Cole
AU  - Đorđević, Pavle
AU  - Rogan, Jelena
AU  - Vulić, Predrag
AU  - Buljak, Vladimir
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4136
AB  - Single phase MgAl2O4 was made from a one-to-one molar ratio of MgO and Al2O3 powders mixed using ball-milling. Mixtures of MgO and Al2O3 were subsequently treated in planetary ball mill for 30, 60, 90 and 120 minutes in air. The aim of this study was to examine phase composition, microstructure, and densification behavior of sintered specimens. After sintering in dilatometer at 1500 degrees C, the powder was converted to single phase MgAl2O4. The results show that mechanical activation improved the densification behavior of MgAl2O4 sintered specimens, and it reduced the onset temperature for sintering by approx. 100 degrees C. Based on dilatometer data, powders were subsequently densified at 1450 degrees C by hot pressing. Almost all specimens exhibited full density, while sample activated for 30 minutes showed the fastest densification rate.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Characterization of MgAl2O4 Sintered Ceramics
EP  - 376
IS  - 4
SP  - 363
VL  - 51
DO  - 10.2298/SOS1904363O
ER  - 

@article{
author = "Obradović, Nina and Fahrenholtz, William G. and Filipović, Suzana and Corlett, Cole and Đorđević, Pavle and Rogan, Jelena and Vulić, Predrag and Buljak, Vladimir and Pavlović, Vladimir B.",
year = "2019",
abstract = "Single phase MgAl2O4 was made from a one-to-one molar ratio of MgO and Al2O3 powders mixed using ball-milling. Mixtures of MgO and Al2O3 were subsequently treated in planetary ball mill for 30, 60, 90 and 120 minutes in air. The aim of this study was to examine phase composition, microstructure, and densification behavior of sintered specimens. After sintering in dilatometer at 1500 degrees C, the powder was converted to single phase MgAl2O4. The results show that mechanical activation improved the densification behavior of MgAl2O4 sintered specimens, and it reduced the onset temperature for sintering by approx. 100 degrees C. Based on dilatometer data, powders were subsequently densified at 1450 degrees C by hot pressing. Almost all specimens exhibited full density, while sample activated for 30 minutes showed the fastest densification rate.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Characterization of MgAl2O4 Sintered Ceramics",
pages = "376-363",
number = "4",
volume = "51",
doi = "10.2298/SOS1904363O"
}

Obradović, N., Fahrenholtz, W. G., Filipović, S., Corlett, C., Đorđević, P., Rogan, J., Vulić, P., Buljak, V.,& Pavlović, V. B.. (2019). Characterization of MgAl2O4 Sintered Ceramics. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 51(4), 363-376.
https://doi.org/10.2298/SOS1904363O

Obradović N, Fahrenholtz WG, Filipović S, Corlett C, Đorđević P, Rogan J, Vulić P, Buljak V, Pavlović VB. Characterization of MgAl2O4 Sintered Ceramics. in Science of Sintering. 2019;51(4):363-376.
doi:10.2298/SOS1904363O .

Obradović, Nina, Fahrenholtz, William G., Filipović, Suzana, Corlett, Cole, Đorđević, Pavle, Rogan, Jelena, Vulić, Predrag, Buljak, Vladimir, Pavlović, Vladimir B., "Characterization of MgAl2O4 Sintered Ceramics" in Science of Sintering, 51, no. 4 (2019):363-376,
https://doi.org/10.2298/SOS1904363O . .

TY  - JOUR
AU  - Stojanović, Jovica
AU  - Smiljanić, Sonja
AU  - Grujić, Snežana
AU  - Vulić, Predrag
AU  - Matijašević, Srđan D.
AU  - Nikolić, Jelena D.
AU  - Savić, Veljko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4305
AB  - The crystal structure of new lanthanum strontium borate glass-ceramics was refined by the Rietveld method. The results showed that La2SrB10O19 has the monoclinic crystal structure, space group C2 (No. 5) with a = 11.1170(6), b = 6.5667(3), c = 9.2363(3) angstrom,beta = 91.481 degrees, V = 674.04(7) angstrom(3), two formula units per unit-cell, and density 3.830 g cm(-3). The main building units of the crystal structure are BO4 tetrahedra and BO3 triangles. Clusters composed of [B5O12] form an infinite double layer running perpendicular to the c-axis. Lanthanum atoms, situated in [B5O12](n) layers, are coordinated with 10 oxygen atom in a form of LaO10 polyhedra, while Sr atoms, located between [B5O12](n) layers, are coordinated with 8 oxygen atoms in a form of SrO8 polyhedra. Microstructural measurements contain both crystallite domain sizes and microstrain calculations obtained by the Warren Averbach and the simplified integral-breadth methods.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Structure and Microstructure Characterization of the La2SrB10O19 Glass-ceramics
EP  - 399
IS  - 4
SP  - 389
VL  - 51
DO  - 10.2298/SOS1904389S
ER  - 

@article{
author = "Stojanović, Jovica and Smiljanić, Sonja and Grujić, Snežana and Vulić, Predrag and Matijašević, Srđan D. and Nikolić, Jelena D. and Savić, Veljko",
year = "2019",
abstract = "The crystal structure of new lanthanum strontium borate glass-ceramics was refined by the Rietveld method. The results showed that La2SrB10O19 has the monoclinic crystal structure, space group C2 (No. 5) with a = 11.1170(6), b = 6.5667(3), c = 9.2363(3) angstrom,beta = 91.481 degrees, V = 674.04(7) angstrom(3), two formula units per unit-cell, and density 3.830 g cm(-3). The main building units of the crystal structure are BO4 tetrahedra and BO3 triangles. Clusters composed of [B5O12] form an infinite double layer running perpendicular to the c-axis. Lanthanum atoms, situated in [B5O12](n) layers, are coordinated with 10 oxygen atom in a form of LaO10 polyhedra, while Sr atoms, located between [B5O12](n) layers, are coordinated with 8 oxygen atoms in a form of SrO8 polyhedra. Microstructural measurements contain both crystallite domain sizes and microstrain calculations obtained by the Warren Averbach and the simplified integral-breadth methods.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Structure and Microstructure Characterization of the La2SrB10O19 Glass-ceramics",
pages = "399-389",
number = "4",
volume = "51",
doi = "10.2298/SOS1904389S"
}

Stojanović, J., Smiljanić, S., Grujić, S., Vulić, P., Matijašević, S. D., Nikolić, J. D.,& Savić, V.. (2019). Structure and Microstructure Characterization of the La2SrB10O19 Glass-ceramics. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 51(4), 389-399.
https://doi.org/10.2298/SOS1904389S

Stojanović J, Smiljanić S, Grujić S, Vulić P, Matijašević SD, Nikolić JD, Savić V. Structure and Microstructure Characterization of the La2SrB10O19 Glass-ceramics. in Science of Sintering. 2019;51(4):389-399.
doi:10.2298/SOS1904389S .

Stojanović, Jovica, Smiljanić, Sonja, Grujić, Snežana, Vulić, Predrag, Matijašević, Srđan D., Nikolić, Jelena D., Savić, Veljko, "Structure and Microstructure Characterization of the La2SrB10O19 Glass-ceramics" in Science of Sintering, 51, no. 4 (2019):389-399,
https://doi.org/10.2298/SOS1904389S . .

TY  - CONF
AU  - Radovanović, Lidija
AU  - Vulić, Predrag
AU  - Jagličić, Zvonko
AU  - Radovanović, Željko
AU  - Zeković, Ivana
AU  - Rogan, Jelena
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6699
AB  - Reakcijom izmene liganada sintetisan je dvofazni materijal I izgrađen od kompleksa
[Mn(dipya)(H2O)4](tpht) i {[Zn(dipya)(tpht)]·H2O}n(tpht = anjon tereftalne kiseline,
dipya = 2,2’-dipiridilamin) i okarakterisan je rendgenskom difrakcijom praha (XRPD),
elementarnom analizom i IC-spektroskopijom. Ritveldovom metodom utvrđena je
struktura obe faze na osnovu poznatih kristalnih struktura kompleksa
[Mn(dipya)(H2O)4](tpht) (monokliničan sistem, prostorna grupa P21/c, a = 7,62769(7),
b = 23,8578(2), c = 11,09364(20) Å, β = 102,2997(10) °) i {[Zn(dipya)(tpht)]·H2O}n
(monokliničan sistem, prostorna grupa P21/n, a = 9,83498(12), b = 14,40421(15),
c = 12,27228(16) Å, β = 95,7954(9) °), koje su određene rendgenskom strukturnom
analizom [1, 2]. Odnos faza [Mn(dipya)(H2O)4](tpht) i {[Zn(dipya)(tpht)]·H2O}n u I
iznosio je 31:69 mas. %. Rezultati utačnjavanja Ritveldovom metodom u dobroj su
saglasnosti, sa neznatnim odstupanjem od strukturnih parametara originalnih struktura:
Rp: 4,28, Rwp: 5,60, Rexp: 4,42, χ
2
: 1,60, RB: 2,39, Rf: 1,99 za Mn(II)-fazu i RB: 3,15,
Rf: 3,13 za Zn(II)-fazu. Mn(II)-fazu obrazuju diskretne kompleksne jedinke
[Mn(dipya)(H2O)4](tpht) u kojima tpht ima ulogu jona suprotnog naelektrisanja sa
deformisano-oktaedarskom geometrijom Mn(II)-jona. Zn(II)-faza izgrađena je od cikcak lanaca {[Zn(dipya)(tpht)]·H2O}n, sa dva kristalografski različita mostovna tphtliganda: bis-helatnim i bis-monodentatnim. Zn(II)-jon se nalazi u deformisanom
kvadratno-piramidalnom okruženju. Termičko ponašanje I ispitano je simultanom
TG/DSC-analizom u atmosferi vazduha i azota. XRPD identifikacija čvrstog ostatka
nakon analize u atmosferi vazduha pokazala je prisustvo dve faze: ZnO (ICDD PDF 36-
1451) i ZnMn2O4 (ICDD PDF 24-1123), čija je morfologija ispitana skenirajućom
elektronskom mikroskopijom (SEM). Merenjem magnetne susceptibilnosti na niskim
temperaturama utvrđene su magnetne interakcije u I i analizirana su fotoluminescentna
svojstva na sobnoj temperaturi.
AB  - A biphasic material I that is composed of complexes [Mn(dipya)(H2O)4](tpht) and
{[Zn(dipya)(tpht)]·H2O}n(tpht = anion of terephthalic acid, dipya = 2,2’-dipyridylamine)
has been synthesized by the ligand exchange reaction and characterized by X-ray powder
diffraction (XRPD), elemental analysis and IR spectroscopy. The structural
characterization of each phase was performed by Rietveld method according to the
known crystal structures of [Mn(dipya)(H2O)4](tpht) (monoclinic, space group P21/c,
a = 7,62769(7), b = 23,8578(2), c = 11,09364(20) Å, β = 102,2997(10) °) and
{[Zn(dipya)(tpht)]·H2O}n (monoclinic, space group P21/n, a = 9,83498(12),
b = 14,40421(15), c = 12,27228(16) Å, β = 95,7954(9) °) determined from single crystal
data [1, 2]. [Mn(dipya)(H2O)4](tpht) to {[Zn(dipya)(tpht)]·H2O}n phase-ratio in I was
31:69 wt. %. The Rietveld refinement results were in a good agreement with a minor
deviation of the final structural parameters from the original structures: Rp: 4.28,
Rwp: 5.60, Rexp: 4.42, χ
2
: 1.60, RB: 2.39, Rf: 1.99 for the Mn(II)-phase, and RB: 3.15,
Rf: 3.13 for the Zn(II)-phase. The Mn(II)-phase consists of discrete complex units
[Mn(dipya)(H2O)4](tpht) in which the tpht is counter anion and with distorted octahedral
geometry of Mn(II) ion. The Zn(II)-phase is comprised of zigzag chains of
{[Zn(dipya)(tpht)]·H2O}n, with two crystallographically different tpht bridges: bischelate and bis-monodentate and Zn(II) ion in a distorted square pyramidal environment.
The thermal behavior of I was studied by simultaneous TG/DSC analysis in both air and
N2 atmospheres. XRPD identification of the solid residue after analysis in air atmosphere
confirmed the presence of two phases: ZnO (ICDD PDF 36-1451) and ZnMn2O4
(ICDD PDF 24-1123), whose morphologies were analyzed using scanning electron
microscopy (SEM). The magnetic susceptibility measurements at low temperatures of I
were performed in order to examine the magnetic interactions and photoluminescence
properties at room temperature have been investigated.
PB  - Beograd : Srpsko kristalografsko društvo = Serbian Crystallographic Society
C3  - Izvodi radova / XXV konferencija Srpskog kristalografskog društva = Abstracts / 25th Conference of the Serbian Crystallographic Society, Bajina Bašta, 21-23. jun 2018
T1  - SINTEZA, STRUKTURA I SVOJSTVA DVOFAZNOG Mn(II)/Zn(II) MATERIJALA
T1  - SYNTHESIS, STRUCTURE AND PROPERTIES OF Mn(II)/Zn(II) BIPHASIC MATERIAL
EP  - 87
SP  - 86
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6699
ER  - 

@conference{
author = "Radovanović, Lidija and Vulić, Predrag and Jagličić, Zvonko and Radovanović, Željko and Zeković, Ivana and Rogan, Jelena",
year = "2018",
abstract = "Reakcijom izmene liganada sintetisan je dvofazni materijal I izgrađen od kompleksa
[Mn(dipya)(H2O)4](tpht) i {[Zn(dipya)(tpht)]·H2O}n(tpht = anjon tereftalne kiseline,
dipya = 2,2’-dipiridilamin) i okarakterisan je rendgenskom difrakcijom praha (XRPD),
elementarnom analizom i IC-spektroskopijom. Ritveldovom metodom utvrđena je
struktura obe faze na osnovu poznatih kristalnih struktura kompleksa
[Mn(dipya)(H2O)4](tpht) (monokliničan sistem, prostorna grupa P21/c, a = 7,62769(7),
b = 23,8578(2), c = 11,09364(20) Å, β = 102,2997(10) °) i {[Zn(dipya)(tpht)]·H2O}n
(monokliničan sistem, prostorna grupa P21/n, a = 9,83498(12), b = 14,40421(15),
c = 12,27228(16) Å, β = 95,7954(9) °), koje su određene rendgenskom strukturnom
analizom [1, 2]. Odnos faza [Mn(dipya)(H2O)4](tpht) i {[Zn(dipya)(tpht)]·H2O}n u I
iznosio je 31:69 mas. %. Rezultati utačnjavanja Ritveldovom metodom u dobroj su
saglasnosti, sa neznatnim odstupanjem od strukturnih parametara originalnih struktura:
Rp: 4,28, Rwp: 5,60, Rexp: 4,42, χ
2
: 1,60, RB: 2,39, Rf: 1,99 za Mn(II)-fazu i RB: 3,15,
Rf: 3,13 za Zn(II)-fazu. Mn(II)-fazu obrazuju diskretne kompleksne jedinke
[Mn(dipya)(H2O)4](tpht) u kojima tpht ima ulogu jona suprotnog naelektrisanja sa
deformisano-oktaedarskom geometrijom Mn(II)-jona. Zn(II)-faza izgrađena je od cikcak lanaca {[Zn(dipya)(tpht)]·H2O}n, sa dva kristalografski različita mostovna tphtliganda: bis-helatnim i bis-monodentatnim. Zn(II)-jon se nalazi u deformisanom
kvadratno-piramidalnom okruženju. Termičko ponašanje I ispitano je simultanom
TG/DSC-analizom u atmosferi vazduha i azota. XRPD identifikacija čvrstog ostatka
nakon analize u atmosferi vazduha pokazala je prisustvo dve faze: ZnO (ICDD PDF 36-
1451) i ZnMn2O4 (ICDD PDF 24-1123), čija je morfologija ispitana skenirajućom
elektronskom mikroskopijom (SEM). Merenjem magnetne susceptibilnosti na niskim
temperaturama utvrđene su magnetne interakcije u I i analizirana su fotoluminescentna
svojstva na sobnoj temperaturi., A biphasic material I that is composed of complexes [Mn(dipya)(H2O)4](tpht) and
{[Zn(dipya)(tpht)]·H2O}n(tpht = anion of terephthalic acid, dipya = 2,2’-dipyridylamine)
has been synthesized by the ligand exchange reaction and characterized by X-ray powder
diffraction (XRPD), elemental analysis and IR spectroscopy. The structural
characterization of each phase was performed by Rietveld method according to the
known crystal structures of [Mn(dipya)(H2O)4](tpht) (monoclinic, space group P21/c,
a = 7,62769(7), b = 23,8578(2), c = 11,09364(20) Å, β = 102,2997(10) °) and
{[Zn(dipya)(tpht)]·H2O}n (monoclinic, space group P21/n, a = 9,83498(12),
b = 14,40421(15), c = 12,27228(16) Å, β = 95,7954(9) °) determined from single crystal
data [1, 2]. [Mn(dipya)(H2O)4](tpht) to {[Zn(dipya)(tpht)]·H2O}n phase-ratio in I was
31:69 wt. %. The Rietveld refinement results were in a good agreement with a minor
deviation of the final structural parameters from the original structures: Rp: 4.28,
Rwp: 5.60, Rexp: 4.42, χ
2
: 1.60, RB: 2.39, Rf: 1.99 for the Mn(II)-phase, and RB: 3.15,
Rf: 3.13 for the Zn(II)-phase. The Mn(II)-phase consists of discrete complex units
[Mn(dipya)(H2O)4](tpht) in which the tpht is counter anion and with distorted octahedral
geometry of Mn(II) ion. The Zn(II)-phase is comprised of zigzag chains of
{[Zn(dipya)(tpht)]·H2O}n, with two crystallographically different tpht bridges: bischelate and bis-monodentate and Zn(II) ion in a distorted square pyramidal environment.
The thermal behavior of I was studied by simultaneous TG/DSC analysis in both air and
N2 atmospheres. XRPD identification of the solid residue after analysis in air atmosphere
confirmed the presence of two phases: ZnO (ICDD PDF 36-1451) and ZnMn2O4
(ICDD PDF 24-1123), whose morphologies were analyzed using scanning electron
microscopy (SEM). The magnetic susceptibility measurements at low temperatures of I
were performed in order to examine the magnetic interactions and photoluminescence
properties at room temperature have been investigated.",
publisher = "Beograd : Srpsko kristalografsko društvo = Serbian Crystallographic Society",
journal = "Izvodi radova / XXV konferencija Srpskog kristalografskog društva = Abstracts / 25th Conference of the Serbian Crystallographic Society, Bajina Bašta, 21-23. jun 2018",
title = "SINTEZA, STRUKTURA I SVOJSTVA DVOFAZNOG Mn(II)/Zn(II) MATERIJALA, SYNTHESIS, STRUCTURE AND PROPERTIES OF Mn(II)/Zn(II) BIPHASIC MATERIAL",
pages = "87-86",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6699"
}

Radovanović, L., Vulić, P., Jagličić, Z., Radovanović, Ž., Zeković, I.,& Rogan, J.. (2018). SINTEZA, STRUKTURA I SVOJSTVA DVOFAZNOG Mn(II)/Zn(II) MATERIJALA. in Izvodi radova / XXV konferencija Srpskog kristalografskog društva = Abstracts / 25th Conference of the Serbian Crystallographic Society, Bajina Bašta, 21-23. jun 2018
Beograd : Srpsko kristalografsko društvo = Serbian Crystallographic Society., 86-87.
https://hdl.handle.net/21.15107/rcub_technorep_6699

Radovanović L, Vulić P, Jagličić Z, Radovanović Ž, Zeković I, Rogan J. SINTEZA, STRUKTURA I SVOJSTVA DVOFAZNOG Mn(II)/Zn(II) MATERIJALA. in Izvodi radova / XXV konferencija Srpskog kristalografskog društva = Abstracts / 25th Conference of the Serbian Crystallographic Society, Bajina Bašta, 21-23. jun 2018. 2018;:86-87.
https://hdl.handle.net/21.15107/rcub_technorep_6699 .

Radovanović, Lidija, Vulić, Predrag, Jagličić, Zvonko, Radovanović, Željko, Zeković, Ivana, Rogan, Jelena, "SINTEZA, STRUKTURA I SVOJSTVA DVOFAZNOG Mn(II)/Zn(II) MATERIJALA" in Izvodi radova / XXV konferencija Srpskog kristalografskog društva = Abstracts / 25th Conference of the Serbian Crystallographic Society, Bajina Bašta, 21-23. jun 2018 (2018):86-87,
https://hdl.handle.net/21.15107/rcub_technorep_6699 .

TY  - JOUR
AU  - Radojković, Aleksandar
AU  - Luković-Golić, Danijela
AU  - Ćirković, Jovana
AU  - Marinković-Stanojević, Zorica
AU  - Pajić, Damir
AU  - Torić, Filip
AU  - Dapčević, Aleksandra
AU  - Vulić, Predrag
AU  - Branković, Zorica
AU  - Branković, Goran
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3856
AB  - Bulk ceramic samples of BiFeO3 were light doped (up to 1%) with Nb5+ in the place of Fe3+ (B-site doping) and their multiferroic properties were investigated using XRD, SEM, polarization (PMTS) and magnetization (SQUID) techniques. It is shown that even the small percentages of doping can notably change electric and magnetic behavior. Electric conductivity differs by two orders of magnitude between samples doped with 0.2% and 1% Nb. The ferroelectric behavior strongly depended on conduction mechanism, and transition from space-charge-limited current (SCLC) conduction to trap-filled limited (TFL) conduction regime reflected on a change in hysteresis patterns, particularly for the samples with 0.2% and 0.5% Nb. Separation of ZFC-FC magnetization curves occurred for all Nb concentrations and increased with Nb doping. Weak ferromagnetic behavior and the increase of remnant magnetization with Nb concentration was observed from the hysteresis measurements. Coercive field changed drastically compared to the pure BiFeO3, namely, the sample with 1% Nb exhibited very high coercive magnetic field of 10 kOe.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Tuning of BiFeO3 multiferroic properties by light doping with Nb
EP  - 16744
IS  - 14
SP  - 16739
VL  - 44
DO  - 10.1016/j.ceramint.2018.06.103
ER  - 

@article{
author = "Radojković, Aleksandar and Luković-Golić, Danijela and Ćirković, Jovana and Marinković-Stanojević, Zorica and Pajić, Damir and Torić, Filip and Dapčević, Aleksandra and Vulić, Predrag and Branković, Zorica and Branković, Goran",
year = "2018",
abstract = "Bulk ceramic samples of BiFeO3 were light doped (up to 1%) with Nb5+ in the place of Fe3+ (B-site doping) and their multiferroic properties were investigated using XRD, SEM, polarization (PMTS) and magnetization (SQUID) techniques. It is shown that even the small percentages of doping can notably change electric and magnetic behavior. Electric conductivity differs by two orders of magnitude between samples doped with 0.2% and 1% Nb. The ferroelectric behavior strongly depended on conduction mechanism, and transition from space-charge-limited current (SCLC) conduction to trap-filled limited (TFL) conduction regime reflected on a change in hysteresis patterns, particularly for the samples with 0.2% and 0.5% Nb. Separation of ZFC-FC magnetization curves occurred for all Nb concentrations and increased with Nb doping. Weak ferromagnetic behavior and the increase of remnant magnetization with Nb concentration was observed from the hysteresis measurements. Coercive field changed drastically compared to the pure BiFeO3, namely, the sample with 1% Nb exhibited very high coercive magnetic field of 10 kOe.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Tuning of BiFeO3 multiferroic properties by light doping with Nb",
pages = "16744-16739",
number = "14",
volume = "44",
doi = "10.1016/j.ceramint.2018.06.103"
}

Radojković, A., Luković-Golić, D., Ćirković, J., Marinković-Stanojević, Z., Pajić, D., Torić, F., Dapčević, A., Vulić, P., Branković, Z.,& Branković, G.. (2018). Tuning of BiFeO3 multiferroic properties by light doping with Nb. in Ceramics International
Elsevier Sci Ltd, Oxford., 44(14), 16739-16744.
https://doi.org/10.1016/j.ceramint.2018.06.103

Radojković A, Luković-Golić D, Ćirković J, Marinković-Stanojević Z, Pajić D, Torić F, Dapčević A, Vulić P, Branković Z, Branković G. Tuning of BiFeO3 multiferroic properties by light doping with Nb. in Ceramics International. 2018;44(14):16739-16744.
doi:10.1016/j.ceramint.2018.06.103 .

Radojković, Aleksandar, Luković-Golić, Danijela, Ćirković, Jovana, Marinković-Stanojević, Zorica, Pajić, Damir, Torić, Filip, Dapčević, Aleksandra, Vulić, Predrag, Branković, Zorica, Branković, Goran, "Tuning of BiFeO3 multiferroic properties by light doping with Nb" in Ceramics International, 44, no. 14 (2018):16739-16744,
https://doi.org/10.1016/j.ceramint.2018.06.103 . .

TY  - CONF
AU  - Radovanović, Lidija
AU  - Vulić, Predrag
AU  - Radovanović, Željko
AU  - Balanč, Bojana
AU  - Simović, Bojana
AU  - Zeković, Ivana
AU  - Dramićanin, Miroslav
AU  - Rogan, Jelena
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3800
AB  - Transition metal oxides are important materials that have found many applications,
as capacitors, sensors or in energy storage [1]. Synthesis of these compounds
has been realized by various methods, such as hydro(solvo)thermal synthesis,
precipitation, microwave synthesis or sol-gel synthesis [2]. Recently, the thermolysis
of coordination compounds as precursors has been considered as a new approach in
obtaining functional nanosized materials. [3]. In this way, by selecting the proper
precursor, it is possible to control the phase composition, morphology and particle
size of a resulting material [3]. The biphasic powder composed of ZnO (zincite) and ZnMn2O4 (hetaerolite), (I) has been
obtained by thermolysis of bimetallic complex [MnZn2(dipya)3(tpht)3(H2O)4]·2H2O
(dipya = 2,2’-dipyridylamine, tpht = dianion of 1,4-benzenedicarboxylic acid) at
450 °C during 1 h in air atmosphere. Scanning Electron Microscopy (SEM) was
used to investigate the morphology of I (Figure 1). It can be observed that the
morphology consists of deformed spherical grains of ZnO with an average diameter
of 67 nm and elliptical grains of hetaerolite whose average diameter and length
were 156 and 290 nm, respectively. The X-ray powder diffraction (XRPD) was
applied to investigate the structure of I. In Figure 2 two-phase Rietveld refinement pattern of I is presented (ZnO to ZnMn2O4 phase-ratio of 62:38 wt. %). The main
crystallographic data and Rietveld refinement parameters for ZnO phase are:
hexagonal, space group P63mc, a = 3.2574(1), c = 5.2175(2) Å, V = 47.945(3) Å3
; for
ZnMn2O4 phase are: tetragonal, space group I41/amd, a = 5.7299(3), c = 9.3000(8) Å,
V = 305.34(3) Å3
; Rwp = 4.80 %, Rp = 3.82 %, Rexp = 3.80 % and χ2
 = 1.5960. UVVis-NIR absorption spectrum was measured in order to investigate the direct band
gap (Eg) of I. Due to the existence of two phases in I, two different Eg values of
2.4 and 3.3 eV for ZnMn2O4 and ZnO phase, respectively, were determined using
Kubelka-Munk function. The mean size, polydispersity index (PDI) and zeta
potential of spherical grains were measured using Zetasizer Nano Series, Nano ZS.
The mean size was 418.6±53.1 nm while PDI value was found to be 0.354±0.099.
Relatively high values of PDI and low apostate value of zeta potential (–6.55 mV)
are indications of incipient instability of colloidal dispersion of I, probably due to the
formation of agglomerates [4, 5]. Photoluminescence measurements were carried
out at room temperature on Fluorolog-3 Model FL3-221 spectrofluorimeter system
upon excitation at 350 nm, in order to study the optical properties of I. This analysis
revealed one band centred at 422 nm in the blue region of the visible part of the
spectrum, which can possibly be associated with defects in the crystal structure of
the ZnO phase [6].
PB  - Belgrade : Serbian Academy of Sciences and Arts
C3  - Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia
T1  - Synthesis, Structure, Morphology and Properties of Biphasic ZnO–ZnMn2O4
EP  - 173
SP  - 171
UR  - https://hdl.handle.net/21.15107/rcub_vinar_8737
ER  - 

@conference{
author = "Radovanović, Lidija and Vulić, Predrag and Radovanović, Željko and Balanč, Bojana and Simović, Bojana and Zeković, Ivana and Dramićanin, Miroslav and Rogan, Jelena",
year = "2018",
abstract = "Transition metal oxides are important materials that have found many applications,
as capacitors, sensors or in energy storage [1]. Synthesis of these compounds
has been realized by various methods, such as hydro(solvo)thermal synthesis,
precipitation, microwave synthesis or sol-gel synthesis [2]. Recently, the thermolysis
of coordination compounds as precursors has been considered as a new approach in
obtaining functional nanosized materials. [3]. In this way, by selecting the proper
precursor, it is possible to control the phase composition, morphology and particle
size of a resulting material [3]. The biphasic powder composed of ZnO (zincite) and ZnMn2O4 (hetaerolite), (I) has been
obtained by thermolysis of bimetallic complex [MnZn2(dipya)3(tpht)3(H2O)4]·2H2O
(dipya = 2,2’-dipyridylamine, tpht = dianion of 1,4-benzenedicarboxylic acid) at
450 °C during 1 h in air atmosphere. Scanning Electron Microscopy (SEM) was
used to investigate the morphology of I (Figure 1). It can be observed that the
morphology consists of deformed spherical grains of ZnO with an average diameter
of 67 nm and elliptical grains of hetaerolite whose average diameter and length
were 156 and 290 nm, respectively. The X-ray powder diffraction (XRPD) was
applied to investigate the structure of I. In Figure 2 two-phase Rietveld refinement pattern of I is presented (ZnO to ZnMn2O4 phase-ratio of 62:38 wt. %). The main
crystallographic data and Rietveld refinement parameters for ZnO phase are:
hexagonal, space group P63mc, a = 3.2574(1), c = 5.2175(2) Å, V = 47.945(3) Å3
; for
ZnMn2O4 phase are: tetragonal, space group I41/amd, a = 5.7299(3), c = 9.3000(8) Å,
V = 305.34(3) Å3
; Rwp = 4.80 %, Rp = 3.82 %, Rexp = 3.80 % and χ2
 = 1.5960. UVVis-NIR absorption spectrum was measured in order to investigate the direct band
gap (Eg) of I. Due to the existence of two phases in I, two different Eg values of
2.4 and 3.3 eV for ZnMn2O4 and ZnO phase, respectively, were determined using
Kubelka-Munk function. The mean size, polydispersity index (PDI) and zeta
potential of spherical grains were measured using Zetasizer Nano Series, Nano ZS.
The mean size was 418.6±53.1 nm while PDI value was found to be 0.354±0.099.
Relatively high values of PDI and low apostate value of zeta potential (–6.55 mV)
are indications of incipient instability of colloidal dispersion of I, probably due to the
formation of agglomerates [4, 5]. Photoluminescence measurements were carried
out at room temperature on Fluorolog-3 Model FL3-221 spectrofluorimeter system
upon excitation at 350 nm, in order to study the optical properties of I. This analysis
revealed one band centred at 422 nm in the blue region of the visible part of the
spectrum, which can possibly be associated with defects in the crystal structure of
the ZnO phase [6].",
publisher = "Belgrade : Serbian Academy of Sciences and Arts",
journal = "Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia",
title = "Synthesis, Structure, Morphology and Properties of Biphasic ZnO–ZnMn2O4",
pages = "173-171",
url = "https://hdl.handle.net/21.15107/rcub_vinar_8737"
}

Radovanović, L., Vulić, P., Radovanović, Ž., Balanč, B., Simović, B., Zeković, I., Dramićanin, M.,& Rogan, J.. (2018). Synthesis, Structure, Morphology and Properties of Biphasic ZnO–ZnMn2O4. in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia
Belgrade : Serbian Academy of Sciences and Arts., 171-173.
https://hdl.handle.net/21.15107/rcub_vinar_8737

Radovanović L, Vulić P, Radovanović Ž, Balanč B, Simović B, Zeković I, Dramićanin M, Rogan J. Synthesis, Structure, Morphology and Properties of Biphasic ZnO–ZnMn2O4. in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia. 2018;:171-173.
https://hdl.handle.net/21.15107/rcub_vinar_8737 .

Radovanović, Lidija, Vulić, Predrag, Radovanović, Željko, Balanč, Bojana, Simović, Bojana, Zeković, Ivana, Dramićanin, Miroslav, Rogan, Jelena, "Synthesis, Structure, Morphology and Properties of Biphasic ZnO–ZnMn2O4" in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia (2018):171-173,
https://hdl.handle.net/21.15107/rcub_vinar_8737 .

TY  - JOUR
AU  - Zdravković, Jelena D.
AU  - Radovanović, Lidija
AU  - Poleti, Dejan
AU  - Rogan, Jelena R.
AU  - Vulić, Predrag J.
AU  - Radovanović, Željko
AU  - Minić, Dragica M.
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4003
AB  - The design of mixed-ligand complexes are of increasing interest from fundamental as well as technological and curative aspects. Having that in mind, we studied zinc complex containing 2,2'-dipyridylamine (dipya) and dianion of isophthalic acid (ipht), [Zn(dipya)(ipht)](n), as promising precursor for synthesis of nanostructured metal oxide. In that sense, the mechanism and degradation kinetics of [Zn(dipya)(ipht)](n), was analyzed under non-isothermal conditions in nitrogen and in air atmospheres. Peak deconvolution of the [Zn(dipya)(ipht)](n), decomposition profile, in the form of a derivative thermogram (DTG), in nitrogen atmosphere, revealed the presence of three decomposition steps, while in air five single steps were isolated. In both cases ZnO is formed as residue at 530 degrees C: pure (in air) or in amorphous matrix (nitrogen). In air we obtained well crystalized ZnO nanospheres (-25 nm), by thermal treatment in temperature range 370-530 degrees C showing that this complex could be considered as good precursor for production of nanosized ZnO.
PB  - Elsevier Masson SAS
T2  - Solid State Sciences
T1  - Mechanism and degradation kinetics of zinc complex containing isophthalato and 2,2 '-dipyridylamine ligands under different atmospheres
EP  - 131
SP  - 123
VL  - 80
DO  - 10.1016/j.solidstatesciences.2018.04.013
ER  - 

@article{
author = "Zdravković, Jelena D. and Radovanović, Lidija and Poleti, Dejan and Rogan, Jelena R. and Vulić, Predrag J. and Radovanović, Željko and Minić, Dragica M.",
year = "2018",
abstract = "The design of mixed-ligand complexes are of increasing interest from fundamental as well as technological and curative aspects. Having that in mind, we studied zinc complex containing 2,2'-dipyridylamine (dipya) and dianion of isophthalic acid (ipht), [Zn(dipya)(ipht)](n), as promising precursor for synthesis of nanostructured metal oxide. In that sense, the mechanism and degradation kinetics of [Zn(dipya)(ipht)](n), was analyzed under non-isothermal conditions in nitrogen and in air atmospheres. Peak deconvolution of the [Zn(dipya)(ipht)](n), decomposition profile, in the form of a derivative thermogram (DTG), in nitrogen atmosphere, revealed the presence of three decomposition steps, while in air five single steps were isolated. In both cases ZnO is formed as residue at 530 degrees C: pure (in air) or in amorphous matrix (nitrogen). In air we obtained well crystalized ZnO nanospheres (-25 nm), by thermal treatment in temperature range 370-530 degrees C showing that this complex could be considered as good precursor for production of nanosized ZnO.",
publisher = "Elsevier Masson SAS",
journal = "Solid State Sciences",
title = "Mechanism and degradation kinetics of zinc complex containing isophthalato and 2,2 '-dipyridylamine ligands under different atmospheres",
pages = "131-123",
volume = "80",
doi = "10.1016/j.solidstatesciences.2018.04.013"
}

Zdravković, J. D., Radovanović, L., Poleti, D., Rogan, J. R., Vulić, P. J., Radovanović, Ž.,& Minić, D. M.. (2018). Mechanism and degradation kinetics of zinc complex containing isophthalato and 2,2 '-dipyridylamine ligands under different atmospheres. in Solid State Sciences
Elsevier Masson SAS., 80, 123-131.
https://doi.org/10.1016/j.solidstatesciences.2018.04.013

Zdravković JD, Radovanović L, Poleti D, Rogan JR, Vulić PJ, Radovanović Ž, Minić DM. Mechanism and degradation kinetics of zinc complex containing isophthalato and 2,2 '-dipyridylamine ligands under different atmospheres. in Solid State Sciences. 2018;80:123-131.
doi:10.1016/j.solidstatesciences.2018.04.013 .

Zdravković, Jelena D., Radovanović, Lidija, Poleti, Dejan, Rogan, Jelena R., Vulić, Predrag J., Radovanović, Željko, Minić, Dragica M., "Mechanism and degradation kinetics of zinc complex containing isophthalato and 2,2 '-dipyridylamine ligands under different atmospheres" in Solid State Sciences, 80 (2018):123-131,
https://doi.org/10.1016/j.solidstatesciences.2018.04.013 . .