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Ferroelectrics Volume 230, 1999 - Issue 1
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Session D: Polymers and glass, amorphous and composites

Effects of thermal treatments on the microstructure and magnetic properties of spinel NiFe2O4 -silica nanocomposites

Li Guangshe Electronic Materials Research Laboratory, Xi'an Jiaotong University, 710049, Xi'an, China
,
Wang Minqiang Electronic Materials Research Laboratory, Xi'an Jiaotong University, 710049, Xi'an, China
,
Li Liping Department of Physics, Jilin University, 130023, Changchun, China
,
Feng Shouhua Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, 130023, Changchun, P. R., China
&
Yao Xi Electronic Materials Research Laboratory, Xi'an Jiaotong University, 710049, Xi'an, China
Pages 67-72 | Received 08 Dec 1998, Published online: 09 Mar 2011
 
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Abstract

The effects of thermal treatments on the microstructure and magnetic properties of NiFe2O4-silica nanocomposites were investigated in this paper. The samples with matrices of silica and mullite gels were prepared by sol-gel processes at different calcination temperatures. The interactions between the magnetic nanocrystals and the matrices as well as the coordination state changes during the crystallization were revealed by Mossbauer spectroscopy. The results show that the sorts and the relative content of the matrix gels strongly affect the structural evolution of the nickel spinel from amorphous state to nanocrystallites.

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