TY  - JOUR
AU  - Milivojević, Dušan
AU  - Babić-Stojić, Branka S.
AU  - Jokanović, Vukoman R.
AU  - Jagličić, Zvonko
AU  - Branković, Dušan
AU  - Jović, Nataša G.
AU  - Čupić, Svetlana D.
AU  - Kojić, Dušan
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4909
AB  - Nanocomposites made of magnetic spinel oxide Co1+yAl2-yO4 particles dispersed in an amorphous SiO2 matrix were synthesized by a sol-gel technique. Samples with various mass fractions of Co1+yAl2-yO4 in composite x, and with various Co concentrations in spinel y were studied. The grain sizes were below 100 nm with a large size distribution. The paper represents thorough investigation of magnetic properties, but special attention was given to peculiar effects and low temperature magnetic frozen states. Magnetic measurements reveal multiple magnetic ground states at the lowest temperature. The frequency dependent ac susceptibility measurements indicate spin-glass behavior of these ground states at low temperatures. The samples, with higher concentration x of Co1+yAl2-yO4 in SiO2, showed very similar Curie-Weiss paramagnetic behavior with antiferromagnetically interacting Co ions (theta a parts per thousand -100 K). Other samples, with lower x, showed complex behavior, spin-glass magnetic freezing at the lowest temperatures and lower absolute value of theta and consequently lower exchange constant.
T2  - Journal of Sol-gel Science and Technology
T1  - Magnetic properties of Co1+yAl2-yO4-SiO2 nanocomposites synthesized by sol-gel method
VL  - 63
IS  - 1
SP  - 56
EP  - 64
DO  - 10.1007/s10971-012-2763-1
ER  - 

@article{
author = "Milivojević, Dušan and Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Jagličić, Zvonko and Branković, Dušan and Jović, Nataša G. and Čupić, Svetlana D. and Kojić, Dušan",
year = "2012",
abstract = "Nanocomposites made of magnetic spinel oxide Co1+yAl2-yO4 particles dispersed in an amorphous SiO2 matrix were synthesized by a sol-gel technique. Samples with various mass fractions of Co1+yAl2-yO4 in composite x, and with various Co concentrations in spinel y were studied. The grain sizes were below 100 nm with a large size distribution. The paper represents thorough investigation of magnetic properties, but special attention was given to peculiar effects and low temperature magnetic frozen states. Magnetic measurements reveal multiple magnetic ground states at the lowest temperature. The frequency dependent ac susceptibility measurements indicate spin-glass behavior of these ground states at low temperatures. The samples, with higher concentration x of Co1+yAl2-yO4 in SiO2, showed very similar Curie-Weiss paramagnetic behavior with antiferromagnetically interacting Co ions (theta a parts per thousand -100 K). Other samples, with lower x, showed complex behavior, spin-glass magnetic freezing at the lowest temperatures and lower absolute value of theta and consequently lower exchange constant.",
journal = "Journal of Sol-gel Science and Technology",
title = "Magnetic properties of Co1+yAl2-yO4-SiO2 nanocomposites synthesized by sol-gel method",
volume = "63",
number = "1",
pages = "56-64",
doi = "10.1007/s10971-012-2763-1"
}

Milivojević, D., Babić-Stojić, B. S., Jokanović, V. R., Jagličić, Z., Branković, D., Jović, N. G., Čupić, S. D.,& Kojić, D.. (2012). Magnetic properties of Co1+yAl2-yO4-SiO2 nanocomposites synthesized by sol-gel method. in Journal of Sol-gel Science and Technology, 63(1), 56-64.
https://doi.org/10.1007/s10971-012-2763-1

Milivojević D, Babić-Stojić BS, Jokanović VR, Jagličić Z, Branković D, Jović NG, Čupić SD, Kojić D. Magnetic properties of Co1+yAl2-yO4-SiO2 nanocomposites synthesized by sol-gel method. in Journal of Sol-gel Science and Technology. 2012;63(1):56-64.
doi:10.1007/s10971-012-2763-1 .

Milivojević, Dušan, Babić-Stojić, Branka S., Jokanović, Vukoman R., Jagličić, Zvonko, Branković, Dušan, Jović, Nataša G., Čupić, Svetlana D., Kojić, Dušan, "Magnetic properties of Co1+yAl2-yO4-SiO2 nanocomposites synthesized by sol-gel method" in Journal of Sol-gel Science and Technology, 63, no. 1 (2012):56-64,
https://doi.org/10.1007/s10971-012-2763-1 . .

TY  - JOUR
AU  - Jović, Nataša G.
AU  - Jokanović, Vukoman R.
AU  - Jagličić, Zvonko
AU  - Branković, Dušan
AU  - Milosavljević, Momir
AU  - Makovec, Darko
AU  - Babić-Stojić, Branka S.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4081
AB  - Nanocomposite made of 10 wt% of Co2.4Al0.6O4 particles dispersed in an amorphous SiO2 matrix has been synthesized by a solgel method. X-ray diffraction, transmission electron microscopy and magnetic measurements have been used to characterize the properties of nanocomposite. Most of the particles are well crystallized and have an average diameter below 100 nm. Smaller particles with size below 10 nm have also been observed. A large value of the effective magnetic moment per Co2+ ion of 5.08 mu B and negative and the low CurieWeiss paramagnetic temperature Theta similar to -6 K, obtained from the high-temperature susceptibility data, indicate a possible mixing of Co2+ and Co3+ ions between tetrahedral and octahedral sites of the spinel crystal lattice. The measurements of static and dynamic magnetic susceptibilities have shown that Co2.4Al0.6O4 particles in SiO2 matrix display a spin glass behavior at low temperatures. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Journal of Magnetism and Magnetic Materials
T1  - Magnetic properties of Co2.4Al0.6O4/SiO2 nanocomposite obtained via sol-gel method
VL  - 322
IS  - 21
SP  - 3271
EP  - 3277
DO  - 10.1016/j.jmmm.2010.06.006
ER  - 

@article{
author = "Jović, Nataša G. and Jokanović, Vukoman R. and Jagličić, Zvonko and Branković, Dušan and Milosavljević, Momir and Makovec, Darko and Babić-Stojić, Branka S.",
year = "2010",
abstract = "Nanocomposite made of 10 wt% of Co2.4Al0.6O4 particles dispersed in an amorphous SiO2 matrix has been synthesized by a solgel method. X-ray diffraction, transmission electron microscopy and magnetic measurements have been used to characterize the properties of nanocomposite. Most of the particles are well crystallized and have an average diameter below 100 nm. Smaller particles with size below 10 nm have also been observed. A large value of the effective magnetic moment per Co2+ ion of 5.08 mu B and negative and the low CurieWeiss paramagnetic temperature Theta similar to -6 K, obtained from the high-temperature susceptibility data, indicate a possible mixing of Co2+ and Co3+ ions between tetrahedral and octahedral sites of the spinel crystal lattice. The measurements of static and dynamic magnetic susceptibilities have shown that Co2.4Al0.6O4 particles in SiO2 matrix display a spin glass behavior at low temperatures. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Journal of Magnetism and Magnetic Materials",
title = "Magnetic properties of Co2.4Al0.6O4/SiO2 nanocomposite obtained via sol-gel method",
volume = "322",
number = "21",
pages = "3271-3277",
doi = "10.1016/j.jmmm.2010.06.006"
}

Jović, N. G., Jokanović, V. R., Jagličić, Z., Branković, D., Milosavljević, M., Makovec, D.,& Babić-Stojić, B. S.. (2010). Magnetic properties of Co2.4Al0.6O4/SiO2 nanocomposite obtained via sol-gel method. in Journal of Magnetism and Magnetic Materials, 322(21), 3271-3277.
https://doi.org/10.1016/j.jmmm.2010.06.006

Jović NG, Jokanović VR, Jagličić Z, Branković D, Milosavljević M, Makovec D, Babić-Stojić BS. Magnetic properties of Co2.4Al0.6O4/SiO2 nanocomposite obtained via sol-gel method. in Journal of Magnetism and Magnetic Materials. 2010;322(21):3271-3277.
doi:10.1016/j.jmmm.2010.06.006 .

Jović, Nataša G., Jokanović, Vukoman R., Jagličić, Zvonko, Branković, Dušan, Milosavljević, Momir, Makovec, Darko, Babić-Stojić, Branka S., "Magnetic properties of Co2.4Al0.6O4/SiO2 nanocomposite obtained via sol-gel method" in Journal of Magnetism and Magnetic Materials, 322, no. 21 (2010):3271-3277,
https://doi.org/10.1016/j.jmmm.2010.06.006 . .