Sol-gel as a Method to Tailor the Magnetic Properties of Co1+yAl2-yO4
Authors
Milivojević, DušanBabić-Stojić, Branka S.
Jokanović, Vukoman R.
Jagličić, Zvonko
Brankovic, D.
Jović, Nataša G.
Čolović, Božana M.
Čupić, Svetlana D.
Kojić, Dušan
Article (Published version)
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Show full item recordAbstract
The magnetic properties of mesoscopic materials are modified by size and surface effects. We present a sol-gel method used to tailor these effects, and illustrate it on Co1+yAl2-yO4 spinel. Nanocomposites made of spinel oxide Co1+yAl2-yO4 particles dispersed in an amorphous SiO2 matrix were synthesized. Samples with various mass fractions -x of Co1+yAl2-yO4 in composite, ranging from predominantly SiO2 (x = 10 wt%) to predominantly spinel (x = 95 wt%), and with various Co concentrations in spinel y were studied. The spinel grain sizes were below 100 nm with a large size distribution, for samples with predominant spinel phase. Those samples showed Curie-Weiss paramagnetic behavior with antiferromagnetically interacting Co ions (theta approximate to -100 K). The grain sizes of spinel stays confined in 100 nm range even in the spinel samples diluted with as low as 5 wt% concentration of amorphous SiO2. For the samples with predominant SiO2 the crystalline nanoparticles are well separated ...and of size of around 100 nm, but with presence of much smaller spinel nanoparticles of about 10 nm. The magnetic properties of the samples with predominant silica phase showed complex behavior, spin-glass magnetic freezing at the lowest temperatures and lower absolute value of theta and consequently lower exchange constant.
Keywords:
Magnetic materials / Sol-gel preparation / Nanocomposites / Spin glass / Magnetic propertiesSource:
Science of Sintering, 2013, 45, 1, 69-78Funding / projects:
- Chemical and structural designing of nanomaterials for application in medicine and tissue engineering (RS-MESTD-Basic Research (BR or ON)-172026)
DOI: 10.2298/SOS1301069M
ISSN: 0350-820X
WoS: 000318150200007
Scopus: 2-s2.0-84877689665
Institution/Community
VinčaTY - JOUR AU - Milivojević, Dušan AU - Babić-Stojić, Branka S. AU - Jokanović, Vukoman R. AU - Jagličić, Zvonko AU - Brankovic, D. AU - Jović, Nataša G. AU - Čolović, Božana M. AU - Čupić, Svetlana D. AU - Kojić, Dušan PY - 2013 UR - https://vinar.vin.bg.ac.rs/handle/123456789/5471 AB - The magnetic properties of mesoscopic materials are modified by size and surface effects. We present a sol-gel method used to tailor these effects, and illustrate it on Co1+yAl2-yO4 spinel. Nanocomposites made of spinel oxide Co1+yAl2-yO4 particles dispersed in an amorphous SiO2 matrix were synthesized. Samples with various mass fractions -x of Co1+yAl2-yO4 in composite, ranging from predominantly SiO2 (x = 10 wt%) to predominantly spinel (x = 95 wt%), and with various Co concentrations in spinel y were studied. The spinel grain sizes were below 100 nm with a large size distribution, for samples with predominant spinel phase. Those samples showed Curie-Weiss paramagnetic behavior with antiferromagnetically interacting Co ions (theta approximate to -100 K). The grain sizes of spinel stays confined in 100 nm range even in the spinel samples diluted with as low as 5 wt% concentration of amorphous SiO2. For the samples with predominant SiO2 the crystalline nanoparticles are well separated and of size of around 100 nm, but with presence of much smaller spinel nanoparticles of about 10 nm. The magnetic properties of the samples with predominant silica phase showed complex behavior, spin-glass magnetic freezing at the lowest temperatures and lower absolute value of theta and consequently lower exchange constant. T2 - Science of Sintering T1 - Sol-gel as a Method to Tailor the Magnetic Properties of Co1+yAl2-yO4 VL - 45 IS - 1 SP - 69 EP - 78 DO - 10.2298/SOS1301069M ER -
@article{ author = "Milivojević, Dušan and Babić-Stojić, Branka S. and Jokanović, Vukoman R. and Jagličić, Zvonko and Brankovic, D. and Jović, Nataša G. and Čolović, Božana M. and Čupić, Svetlana D. and Kojić, Dušan", year = "2013", abstract = "The magnetic properties of mesoscopic materials are modified by size and surface effects. We present a sol-gel method used to tailor these effects, and illustrate it on Co1+yAl2-yO4 spinel. Nanocomposites made of spinel oxide Co1+yAl2-yO4 particles dispersed in an amorphous SiO2 matrix were synthesized. Samples with various mass fractions -x of Co1+yAl2-yO4 in composite, ranging from predominantly SiO2 (x = 10 wt%) to predominantly spinel (x = 95 wt%), and with various Co concentrations in spinel y were studied. The spinel grain sizes were below 100 nm with a large size distribution, for samples with predominant spinel phase. Those samples showed Curie-Weiss paramagnetic behavior with antiferromagnetically interacting Co ions (theta approximate to -100 K). The grain sizes of spinel stays confined in 100 nm range even in the spinel samples diluted with as low as 5 wt% concentration of amorphous SiO2. For the samples with predominant SiO2 the crystalline nanoparticles are well separated and of size of around 100 nm, but with presence of much smaller spinel nanoparticles of about 10 nm. The magnetic properties of the samples with predominant silica phase showed complex behavior, spin-glass magnetic freezing at the lowest temperatures and lower absolute value of theta and consequently lower exchange constant.", journal = "Science of Sintering", title = "Sol-gel as a Method to Tailor the Magnetic Properties of Co1+yAl2-yO4", volume = "45", number = "1", pages = "69-78", doi = "10.2298/SOS1301069M" }
Milivojević, D., Babić-Stojić, B. S., Jokanović, V. R., Jagličić, Z., Brankovic, D., Jović, N. G., Čolović, B. M., Čupić, S. D.,& Kojić, D.. (2013). Sol-gel as a Method to Tailor the Magnetic Properties of Co1+yAl2-yO4. in Science of Sintering, 45(1), 69-78. https://doi.org/10.2298/SOS1301069M
Milivojević D, Babić-Stojić BS, Jokanović VR, Jagličić Z, Brankovic D, Jović NG, Čolović BM, Čupić SD, Kojić D. Sol-gel as a Method to Tailor the Magnetic Properties of Co1+yAl2-yO4. in Science of Sintering. 2013;45(1):69-78. doi:10.2298/SOS1301069M .
Milivojević, Dušan, Babić-Stojić, Branka S., Jokanović, Vukoman R., Jagličić, Zvonko, Brankovic, D., Jović, Nataša G., Čolović, Božana M., Čupić, Svetlana D., Kojić, Dušan, "Sol-gel as a Method to Tailor the Magnetic Properties of Co1+yAl2-yO4" in Science of Sintering, 45, no. 1 (2013):69-78, https://doi.org/10.2298/SOS1301069M . .