TY  - JOUR
AU  - Dohcevic-Mitrovic, Z. D.
AU  - Paunović, Novica M.
AU  - Matović, Branko
AU  - Osiceanu, P.
AU  - Scurtu, R.
AU  - Askrabic, S.
AU  - Radović, Marko B.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/505
AB  - Y-doped HfO2 nanopowders, produced by metathesis synthesis, exhibit ferromagnetism at room temperature. The X-ray diffraction and Raman measurements have shown that HfO2 nanopowders undergo phase transformation from monoclinic to tetragonal and cubic phase with increasing of Y content. The X-ray photoelectron spectroscopy and Raman analysis gave evidence that Y-doped HfO2 nanopowders are oxygen deficient. The ferromagnetic properties of Y-doped HfO2 nanocrystals are dependent on crystal structure changes. The structural transformation from monoclinic to tetragonal phase with Y doping is followed by increased ferromagnetic ordering because of the increased concentration of oxygen vacancies (V-O) in different charge states. Higher Y content favors the formation of cubic phase and the ferromagnetism significantly weakens. In cubic hafnia phase, yttrium can form (V-O-Y-Hf) defect complexes in different charge states. The appearance of these complexes can be responsible for the degradation of ferromagnetic ordering. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Structural dependent room-temperature ferromagnetism in yttrium doped HfO2 nanoparticles
VL  - 41
IS  - 5
SP  - 6970
EP  - 6977
DO  - 10.1016/j.ceramint.2015.02.002
ER  - 

@article{
author = "Dohcevic-Mitrovic, Z. D. and Paunović, Novica M. and Matović, Branko and Osiceanu, P. and Scurtu, R. and Askrabic, S. and Radović, Marko B.",
year = "2015",
abstract = "Y-doped HfO2 nanopowders, produced by metathesis synthesis, exhibit ferromagnetism at room temperature. The X-ray diffraction and Raman measurements have shown that HfO2 nanopowders undergo phase transformation from monoclinic to tetragonal and cubic phase with increasing of Y content. The X-ray photoelectron spectroscopy and Raman analysis gave evidence that Y-doped HfO2 nanopowders are oxygen deficient. The ferromagnetic properties of Y-doped HfO2 nanocrystals are dependent on crystal structure changes. The structural transformation from monoclinic to tetragonal phase with Y doping is followed by increased ferromagnetic ordering because of the increased concentration of oxygen vacancies (V-O) in different charge states. Higher Y content favors the formation of cubic phase and the ferromagnetism significantly weakens. In cubic hafnia phase, yttrium can form (V-O-Y-Hf) defect complexes in different charge states. The appearance of these complexes can be responsible for the degradation of ferromagnetic ordering. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Structural dependent room-temperature ferromagnetism in yttrium doped HfO2 nanoparticles",
volume = "41",
number = "5",
pages = "6970-6977",
doi = "10.1016/j.ceramint.2015.02.002"
}

Dohcevic-Mitrovic, Z. D., Paunović, N. M., Matović, B., Osiceanu, P., Scurtu, R., Askrabic, S.,& Radović, M. B.. (2015). Structural dependent room-temperature ferromagnetism in yttrium doped HfO2 nanoparticles. in Ceramics International, 41(5), 6970-6977.
https://doi.org/10.1016/j.ceramint.2015.02.002

Dohcevic-Mitrovic ZD, Paunović NM, Matović B, Osiceanu P, Scurtu R, Askrabic S, Radović MB. Structural dependent room-temperature ferromagnetism in yttrium doped HfO2 nanoparticles. in Ceramics International. 2015;41(5):6970-6977.
doi:10.1016/j.ceramint.2015.02.002 .

Dohcevic-Mitrovic, Z. D., Paunović, Novica M., Matović, Branko, Osiceanu, P., Scurtu, R., Askrabic, S., Radović, Marko B., "Structural dependent room-temperature ferromagnetism in yttrium doped HfO2 nanoparticles" in Ceramics International, 41, no. 5 (2015):6970-6977,
https://doi.org/10.1016/j.ceramint.2015.02.002 . .

TY  - JOUR
AU  - Matović, Branko
AU  - Bučevac, Dušan
AU  - Rosić, Milena
AU  - Babić, Biljana M.
AU  - Dohcevic-Mitrovic, Z. D.
AU  - Radović, Marko B.
AU  - Popović, Zoran V.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4544
AB  - Nanopowdered solid solution Ce(1-x)Cu(x)O(2-gamma) samples (0 LT = x LT = 0.15) were synthesized by self-propagating room temperature synthesis (SPRT). Raman spectroscopy and XRD at room temperature were used to study the vibration properties of these materials as well as the Cu solubility in ceria lattice. The solubility limit of Cu(2+) in CeO(2) lattice was found to be lower than published in the literature. Results show that obtained powders with low dopant concentration are solid solutions with a fluorite-type crystal structure. However, with Cu content higher than 7.5 mass%, the phase separation was observed and two oxide phases, CeO(2) and CuO, coexist. All powders were nanometric in size with high specific surface area. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Synthesis and characterization of Cu-doped ceria nanopowders
VL  - 37
IS  - 8
SP  - 3161
EP  - 3165
DO  - 10.1016/j.ceramint.2011.03.078
ER  - 

@article{
author = "Matović, Branko and Bučevac, Dušan and Rosić, Milena and Babić, Biljana M. and Dohcevic-Mitrovic, Z. D. and Radović, Marko B. and Popović, Zoran V.",
year = "2011",
abstract = "Nanopowdered solid solution Ce(1-x)Cu(x)O(2-gamma) samples (0 LT = x LT = 0.15) were synthesized by self-propagating room temperature synthesis (SPRT). Raman spectroscopy and XRD at room temperature were used to study the vibration properties of these materials as well as the Cu solubility in ceria lattice. The solubility limit of Cu(2+) in CeO(2) lattice was found to be lower than published in the literature. Results show that obtained powders with low dopant concentration are solid solutions with a fluorite-type crystal structure. However, with Cu content higher than 7.5 mass%, the phase separation was observed and two oxide phases, CeO(2) and CuO, coexist. All powders were nanometric in size with high specific surface area. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Synthesis and characterization of Cu-doped ceria nanopowders",
volume = "37",
number = "8",
pages = "3161-3165",
doi = "10.1016/j.ceramint.2011.03.078"
}

Matović, B., Bučevac, D., Rosić, M., Babić, B. M., Dohcevic-Mitrovic, Z. D., Radović, M. B.,& Popović, Z. V.. (2011). Synthesis and characterization of Cu-doped ceria nanopowders. in Ceramics International, 37(8), 3161-3165.
https://doi.org/10.1016/j.ceramint.2011.03.078

Matović B, Bučevac D, Rosić M, Babić BM, Dohcevic-Mitrovic ZD, Radović MB, Popović ZV. Synthesis and characterization of Cu-doped ceria nanopowders. in Ceramics International. 2011;37(8):3161-3165.
doi:10.1016/j.ceramint.2011.03.078 .

Matović, Branko, Bučevac, Dušan, Rosić, Milena, Babić, Biljana M., Dohcevic-Mitrovic, Z. D., Radović, Marko B., Popović, Zoran V., "Synthesis and characterization of Cu-doped ceria nanopowders" in Ceramics International, 37, no. 8 (2011):3161-3165,
https://doi.org/10.1016/j.ceramint.2011.03.078 . .

TY  - JOUR
AU  - Dohcevic-Mitrovic, Z. D.
AU  - Paunović, Novica M.
AU  - Radović, Marko B.
AU  - Popović, Zoran V.
AU  - Matović, Branko
AU  - Cekić, Božidar Đ.
AU  - Ivanovski, Valentin N.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4007
AB  - Room-temperature ferromagnetism was observed in undoped and Fe(2+(3+))-doped CeO(2) nanocrystals. In Fe-doped samples the enhancement of ferromagnetic ordering occurs by changing the valence state of Fe ions, whereas Raman spectra demonstrated strong electron-molecular vibrational coupling and increase in oxygen vacancy concentration. Air annealing showed degradation of ferromagnetic ordering and appearance of hematite phase in Fe(3+)-doped sample. The observed ferromagnetic coupling in Fe-doped samples, associated with the presence of magnetic ions mediated by single charged O(2-) vacancies, demonstrated that valence state of dopant has a strong influence on magnetic properties of CeO(2) nanoparticles. (C) American Institute of Physics. [doi: 10.1063/1.3431581]
T2  - Applied Physics Letters
T1  - Valence state dependent room-temperature ferromagnetism in Fe-doped ceria nanocrystals
VL  - 96
IS  - 20
DO  - 10.1063/1.3431581
ER  - 

@article{
author = "Dohcevic-Mitrovic, Z. D. and Paunović, Novica M. and Radović, Marko B. and Popović, Zoran V. and Matović, Branko and Cekić, Božidar Đ. and Ivanovski, Valentin N.",
year = "2010",
abstract = "Room-temperature ferromagnetism was observed in undoped and Fe(2+(3+))-doped CeO(2) nanocrystals. In Fe-doped samples the enhancement of ferromagnetic ordering occurs by changing the valence state of Fe ions, whereas Raman spectra demonstrated strong electron-molecular vibrational coupling and increase in oxygen vacancy concentration. Air annealing showed degradation of ferromagnetic ordering and appearance of hematite phase in Fe(3+)-doped sample. The observed ferromagnetic coupling in Fe-doped samples, associated with the presence of magnetic ions mediated by single charged O(2-) vacancies, demonstrated that valence state of dopant has a strong influence on magnetic properties of CeO(2) nanoparticles. (C) American Institute of Physics. [doi: 10.1063/1.3431581]",
journal = "Applied Physics Letters",
title = "Valence state dependent room-temperature ferromagnetism in Fe-doped ceria nanocrystals",
volume = "96",
number = "20",
doi = "10.1063/1.3431581"
}

Dohcevic-Mitrovic, Z. D., Paunović, N. M., Radović, M. B., Popović, Z. V., Matović, B., Cekić, B. Đ.,& Ivanovski, V. N.. (2010). Valence state dependent room-temperature ferromagnetism in Fe-doped ceria nanocrystals. in Applied Physics Letters, 96(20).
https://doi.org/10.1063/1.3431581

Dohcevic-Mitrovic ZD, Paunović NM, Radović MB, Popović ZV, Matović B, Cekić BĐ, Ivanovski VN. Valence state dependent room-temperature ferromagnetism in Fe-doped ceria nanocrystals. in Applied Physics Letters. 2010;96(20).
doi:10.1063/1.3431581 .

Dohcevic-Mitrovic, Z. D., Paunović, Novica M., Radović, Marko B., Popović, Zoran V., Matović, Branko, Cekić, Božidar Đ., Ivanovski, Valentin N., "Valence state dependent room-temperature ferromagnetism in Fe-doped ceria nanocrystals" in Applied Physics Letters, 96, no. 20 (2010),
https://doi.org/10.1063/1.3431581 . .

TY  - JOUR
AU  - Radović, Marko B.
AU  - Dohcevic-Mitrovic, Z. D.
AU  - Golubović, Aleksandar V.
AU  - Matović, Branko
AU  - Šćepanović, Maja
AU  - Popović, Zoran V.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6845
AB  - Pure and 10 mol% Fe3+ doped CeO2 nanocrystals were synthesized by hydrothermal method using two different basic solutions (NH4OH and NaOH). All the samples were calcinated at 140 degrees C and 200 degrees C. The characterization of crystalline structure, vibrational and optical properties was performed using X-ray diffraction, Raman spectroscopy and spectroscopic ellipsometry. The obtained results showed that the Fe-doped samples are solid solutions with different size of nanocrystals, very dependent on the synthesis temperature and type of basic solution. The Raman measurements demonstrated electron molecular vibrational coupling and increase of oxygen vacancy concentration whereas doping provokes a small decrease of optical absorption edge in comparison with pure ceria.
T2  - Acta Physica Polonica A
T1  - Hydrothermal Synthesis of CeO2 and Ce0.9Fe0.1O2 Nanocrystals
VL  - 116
IS  - 4
SP  - 614
EP  - 617
DO  - 10.12693/APhysPolA.116.614
ER  - 

@article{
author = "Radović, Marko B. and Dohcevic-Mitrovic, Z. D. and Golubović, Aleksandar V. and Matović, Branko and Šćepanović, Maja and Popović, Zoran V.",
year = "2009",
abstract = "Pure and 10 mol% Fe3+ doped CeO2 nanocrystals were synthesized by hydrothermal method using two different basic solutions (NH4OH and NaOH). All the samples were calcinated at 140 degrees C and 200 degrees C. The characterization of crystalline structure, vibrational and optical properties was performed using X-ray diffraction, Raman spectroscopy and spectroscopic ellipsometry. The obtained results showed that the Fe-doped samples are solid solutions with different size of nanocrystals, very dependent on the synthesis temperature and type of basic solution. The Raman measurements demonstrated electron molecular vibrational coupling and increase of oxygen vacancy concentration whereas doping provokes a small decrease of optical absorption edge in comparison with pure ceria.",
journal = "Acta Physica Polonica A",
title = "Hydrothermal Synthesis of CeO2 and Ce0.9Fe0.1O2 Nanocrystals",
volume = "116",
number = "4",
pages = "614-617",
doi = "10.12693/APhysPolA.116.614"
}

Radović, M. B., Dohcevic-Mitrovic, Z. D., Golubović, A. V., Matović, B., Šćepanović, M.,& Popović, Z. V.. (2009). Hydrothermal Synthesis of CeO2 and Ce0.9Fe0.1O2 Nanocrystals. in Acta Physica Polonica A, 116(4), 614-617.
https://doi.org/10.12693/APhysPolA.116.614

Radović MB, Dohcevic-Mitrovic ZD, Golubović AV, Matović B, Šćepanović M, Popović ZV. Hydrothermal Synthesis of CeO2 and Ce0.9Fe0.1O2 Nanocrystals. in Acta Physica Polonica A. 2009;116(4):614-617.
doi:10.12693/APhysPolA.116.614 .

Radović, Marko B., Dohcevic-Mitrovic, Z. D., Golubović, Aleksandar V., Matović, Branko, Šćepanović, Maja, Popović, Zoran V., "Hydrothermal Synthesis of CeO2 and Ce0.9Fe0.1O2 Nanocrystals" in Acta Physica Polonica A, 116, no. 4 (2009):614-617,
https://doi.org/10.12693/APhysPolA.116.614 . .

TY  - JOUR
AU  - Dohcevic-Mitrovic, Z. D.
AU  - Radović, Marko B.
AU  - Šćepanović, Maja
AU  - Grujić-Brojčin, Mirjana
AU  - Popović, Zoran V.
AU  - Matović, Branko
AU  - Bošković, Snežana B.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3318
AB  - Raman spectra of Nd doped ceria nanocrystals were measured by gradual heating and cooling over the temperature range of 293-1073 K and analyzed using the phonon confinement model that incorporates inhomogeneous strain and anharmonic effects. We have demonstrated that in nanograins, four-phonon anharmonic processes are more dominant at higher temperatures than size effects. After the heat treatment, Nd doped ceria nanocrystals remain of nanometric range (similar to 20 nm) while the concentration of oxygen vacancies is still high in ceria lattice, making this material convenient for solid oxide fuel cells application. (c) 2007 American Institute of Physics.
T2  - Applied Physics Letters
T1  - Temperature-dependent raman study of Ce0.75Nd0.25O2-delta nanocrystals
VL  - 91
IS  - 20
DO  - 10.1063/1.2815928
ER  - 

@article{
author = "Dohcevic-Mitrovic, Z. D. and Radović, Marko B. and Šćepanović, Maja and Grujić-Brojčin, Mirjana and Popović, Zoran V. and Matović, Branko and Bošković, Snežana B.",
year = "2007",
abstract = "Raman spectra of Nd doped ceria nanocrystals were measured by gradual heating and cooling over the temperature range of 293-1073 K and analyzed using the phonon confinement model that incorporates inhomogeneous strain and anharmonic effects. We have demonstrated that in nanograins, four-phonon anharmonic processes are more dominant at higher temperatures than size effects. After the heat treatment, Nd doped ceria nanocrystals remain of nanometric range (similar to 20 nm) while the concentration of oxygen vacancies is still high in ceria lattice, making this material convenient for solid oxide fuel cells application. (c) 2007 American Institute of Physics.",
journal = "Applied Physics Letters",
title = "Temperature-dependent raman study of Ce0.75Nd0.25O2-delta nanocrystals",
volume = "91",
number = "20",
doi = "10.1063/1.2815928"
}

Dohcevic-Mitrovic, Z. D., Radović, M. B., Šćepanović, M., Grujić-Brojčin, M., Popović, Z. V., Matović, B.,& Bošković, S. B.. (2007). Temperature-dependent raman study of Ce0.75Nd0.25O2-delta nanocrystals. in Applied Physics Letters, 91(20).
https://doi.org/10.1063/1.2815928

Dohcevic-Mitrovic ZD, Radović MB, Šćepanović M, Grujić-Brojčin M, Popović ZV, Matović B, Bošković SB. Temperature-dependent raman study of Ce0.75Nd0.25O2-delta nanocrystals. in Applied Physics Letters. 2007;91(20).
doi:10.1063/1.2815928 .

Dohcevic-Mitrovic, Z. D., Radović, Marko B., Šćepanović, Maja, Grujić-Brojčin, Mirjana, Popović, Zoran V., Matović, Branko, Bošković, Snežana B., "Temperature-dependent raman study of Ce0.75Nd0.25O2-delta nanocrystals" in Applied Physics Letters, 91, no. 20 (2007),
https://doi.org/10.1063/1.2815928 . .

TY  - JOUR
AU  - Dohcevic-Mitrovic, Z. D.
AU  - Grujić-Brojčin, Mirjana
AU  - Šćepanović, Maja
AU  - Popović, Zoran V.
AU  - Bošković, Snežana B.
AU  - Matović, Branko
AU  - Zinkevich, M.
AU  - Aldinger, Fritz
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6619
AB  - Nanopowdered solid solution Ce1-xY(Nd)(x)O2-delta samples ( 0.1 LT = x LT = 0.25) were made by self-propagating room temperature (SPRT) synthesis. The first-order Raman spectra of Ce1-xY(Nd)(x)O2-delta samples measured at room temperature exhibit three broad features: the main Raman active F-2g mode at about 450 cm(-1) and two broad features at about 550 (545) and 600 cm-1. The mode at similar to 600 cm(-1) was assigned to the intrinsic oxygen vacancies due to the nonstoichiometry of ceria nanopowders. The mode at about 550 (545) cm(-1) was attributed to the oxygen vacancies introduced into the ceria lattice whenever Ce4+ ions are replaced with trivalent cations (Y3+, Nd3+). The intensity of this mode increases with doping in both series of samples, indicating a change of O2- vacancy concentration. The mode frequency shifts in opposite direction in Y- and Nd-doped samples with doping level, suggesting that different types of defect space can occur in Y- and Nd-doped ceria nanopowders.
T2  - Journal of Physics: Condensed Matter
T1  - Ce1-xY(Nd)(x)O2-delta nanopowders: potential materials for intermediate temperature solid oxide fuel cells
VL  - 18
IS  - 33
SP  - S2061
EP  - S2068
DO  - 10.1088/0953-8984/18/33/S22
ER  - 

@article{
author = "Dohcevic-Mitrovic, Z. D. and Grujić-Brojčin, Mirjana and Šćepanović, Maja and Popović, Zoran V. and Bošković, Snežana B. and Matović, Branko and Zinkevich, M. and Aldinger, Fritz",
year = "2006",
abstract = "Nanopowdered solid solution Ce1-xY(Nd)(x)O2-delta samples ( 0.1 LT = x LT = 0.25) were made by self-propagating room temperature (SPRT) synthesis. The first-order Raman spectra of Ce1-xY(Nd)(x)O2-delta samples measured at room temperature exhibit three broad features: the main Raman active F-2g mode at about 450 cm(-1) and two broad features at about 550 (545) and 600 cm-1. The mode at similar to 600 cm(-1) was assigned to the intrinsic oxygen vacancies due to the nonstoichiometry of ceria nanopowders. The mode at about 550 (545) cm(-1) was attributed to the oxygen vacancies introduced into the ceria lattice whenever Ce4+ ions are replaced with trivalent cations (Y3+, Nd3+). The intensity of this mode increases with doping in both series of samples, indicating a change of O2- vacancy concentration. The mode frequency shifts in opposite direction in Y- and Nd-doped samples with doping level, suggesting that different types of defect space can occur in Y- and Nd-doped ceria nanopowders.",
journal = "Journal of Physics: Condensed Matter",
title = "Ce1-xY(Nd)(x)O2-delta nanopowders: potential materials for intermediate temperature solid oxide fuel cells",
volume = "18",
number = "33",
pages = "S2061-S2068",
doi = "10.1088/0953-8984/18/33/S22"
}

Dohcevic-Mitrovic, Z. D., Grujić-Brojčin, M., Šćepanović, M., Popović, Z. V., Bošković, S. B., Matović, B., Zinkevich, M.,& Aldinger, F.. (2006). Ce1-xY(Nd)(x)O2-delta nanopowders: potential materials for intermediate temperature solid oxide fuel cells. in Journal of Physics: Condensed Matter, 18(33), S2061-S2068.
https://doi.org/10.1088/0953-8984/18/33/S22

Dohcevic-Mitrovic ZD, Grujić-Brojčin M, Šćepanović M, Popović ZV, Bošković SB, Matović B, Zinkevich M, Aldinger F. Ce1-xY(Nd)(x)O2-delta nanopowders: potential materials for intermediate temperature solid oxide fuel cells. in Journal of Physics: Condensed Matter. 2006;18(33):S2061-S2068.
doi:10.1088/0953-8984/18/33/S22 .

Dohcevic-Mitrovic, Z. D., Grujić-Brojčin, Mirjana, Šćepanović, Maja, Popović, Zoran V., Bošković, Snežana B., Matović, Branko, Zinkevich, M., Aldinger, Fritz, "Ce1-xY(Nd)(x)O2-delta nanopowders: potential materials for intermediate temperature solid oxide fuel cells" in Journal of Physics: Condensed Matter, 18, no. 33 (2006):S2061-S2068,
https://doi.org/10.1088/0953-8984/18/33/S22 . .