Annealing-dependent structural and magnetic properties of nickel oxide (NiO) nanoparticles in a silica matrix
Апстракт
We show that annealing at high temperatures has a significant effect on the structural and magnetic properties of NiO/SiO2 nanostructures synthesized by a sol-gel combustion method. Samples underwent heat treatments at 500 degrees C, 800 degrees C, 950 degrees C and 1100 degrees C. As compared to the 500 degrees C sample, the 800 degrees C sample showed the following magnetic properties: much higher irreversibility temperature, a significantly broadened zero-field-cooled (ZFC) magnetization maximum, a decrease of the ZFC magnetization, an increase of the coercivity, and weaker inter-particle interactions. These changes can be attributed to agglomeration of nanoparticles in part of the sample. We believe that this agglomeration can be explained by the removal of thin regions of silica that separate nanoparticles in close proximity during the annealing process at 800 degrees C. Magnetic measurements for the 1100 sample reveal both an abrupt increase in size of the NiO nanoparticles, whic...h is confirmed by TEM and XRPD measurements, and an increase in inter-particle interaction strength. (C) 2015 Elsevier Ltd. All rights reserved.
Кључне речи:
Nickel oxide (NiO) / Sol-gel combustion synthesis / Interparticle interactions / Superparamagnetism / AC susceptibilityИзвор:
Journal of the European Ceramic Society, 2015, 35, 14, 3843-3852Финансирање / пројекти:
- Магнетни и радионуклидима обележени наноструктурни материјали за примене у медицини (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45015)
DOI: 10.1016/j.jeurceramsoc.2015.06.024
ISSN: 0955-2219; 1873-619X
WoS: 000360511400009
Scopus: 2-s2.0-84939261686
Колекције
Институција/група
VinčaTY - JOUR AU - Nikolic, Dobrica AU - Panjan, Matjaž AU - Blake, Graeme R. AU - Tadić, Marin PY - 2015 UR - https://vinar.vin.bg.ac.rs/handle/123456789/717 AB - We show that annealing at high temperatures has a significant effect on the structural and magnetic properties of NiO/SiO2 nanostructures synthesized by a sol-gel combustion method. Samples underwent heat treatments at 500 degrees C, 800 degrees C, 950 degrees C and 1100 degrees C. As compared to the 500 degrees C sample, the 800 degrees C sample showed the following magnetic properties: much higher irreversibility temperature, a significantly broadened zero-field-cooled (ZFC) magnetization maximum, a decrease of the ZFC magnetization, an increase of the coercivity, and weaker inter-particle interactions. These changes can be attributed to agglomeration of nanoparticles in part of the sample. We believe that this agglomeration can be explained by the removal of thin regions of silica that separate nanoparticles in close proximity during the annealing process at 800 degrees C. Magnetic measurements for the 1100 sample reveal both an abrupt increase in size of the NiO nanoparticles, which is confirmed by TEM and XRPD measurements, and an increase in inter-particle interaction strength. (C) 2015 Elsevier Ltd. All rights reserved. T2 - Journal of the European Ceramic Society T1 - Annealing-dependent structural and magnetic properties of nickel oxide (NiO) nanoparticles in a silica matrix VL - 35 IS - 14 SP - 3843 EP - 3852 DO - 10.1016/j.jeurceramsoc.2015.06.024 ER -
@article{ author = "Nikolic, Dobrica and Panjan, Matjaž and Blake, Graeme R. and Tadić, Marin", year = "2015", abstract = "We show that annealing at high temperatures has a significant effect on the structural and magnetic properties of NiO/SiO2 nanostructures synthesized by a sol-gel combustion method. Samples underwent heat treatments at 500 degrees C, 800 degrees C, 950 degrees C and 1100 degrees C. As compared to the 500 degrees C sample, the 800 degrees C sample showed the following magnetic properties: much higher irreversibility temperature, a significantly broadened zero-field-cooled (ZFC) magnetization maximum, a decrease of the ZFC magnetization, an increase of the coercivity, and weaker inter-particle interactions. These changes can be attributed to agglomeration of nanoparticles in part of the sample. We believe that this agglomeration can be explained by the removal of thin regions of silica that separate nanoparticles in close proximity during the annealing process at 800 degrees C. Magnetic measurements for the 1100 sample reveal both an abrupt increase in size of the NiO nanoparticles, which is confirmed by TEM and XRPD measurements, and an increase in inter-particle interaction strength. (C) 2015 Elsevier Ltd. All rights reserved.", journal = "Journal of the European Ceramic Society", title = "Annealing-dependent structural and magnetic properties of nickel oxide (NiO) nanoparticles in a silica matrix", volume = "35", number = "14", pages = "3843-3852", doi = "10.1016/j.jeurceramsoc.2015.06.024" }
Nikolic, D., Panjan, M., Blake, G. R.,& Tadić, M.. (2015). Annealing-dependent structural and magnetic properties of nickel oxide (NiO) nanoparticles in a silica matrix. in Journal of the European Ceramic Society, 35(14), 3843-3852. https://doi.org/10.1016/j.jeurceramsoc.2015.06.024
Nikolic D, Panjan M, Blake GR, Tadić M. Annealing-dependent structural and magnetic properties of nickel oxide (NiO) nanoparticles in a silica matrix. in Journal of the European Ceramic Society. 2015;35(14):3843-3852. doi:10.1016/j.jeurceramsoc.2015.06.024 .
Nikolic, Dobrica, Panjan, Matjaž, Blake, Graeme R., Tadić, Marin, "Annealing-dependent structural and magnetic properties of nickel oxide (NiO) nanoparticles in a silica matrix" in Journal of the European Ceramic Society, 35, no. 14 (2015):3843-3852, https://doi.org/10.1016/j.jeurceramsoc.2015.06.024 . .