摘要
采用溶胶-凝胶法制备了纳米CoFe2O4/SiO2复合材料。利用X射线衍射(XRD)、透射电镜(TEM)、振动样品磁强计(VSM)和M ssbauer效应研究了纳米复合材料结构、晶粒尺寸及磁性。结果表明,样品中CoFe2O4的晶粒尺寸随着热处理温度的提高而增加,非晶态SiO2的存在有效地抑制了CoFe2O4晶粒的生长。VSM结果表明,样品的比饱和磁化强度和矫顽力随CoFe2O4晶粒尺寸的增加而变大。M ssbauer效应结果表明,随着热处理温度的提高,样品从超顺磁和磁有序的混合状态转变为完全的磁有序状态。
The CoFe2O4/SiO2 nanocomposite was prepared by the sol-gel method. The structure, crystalline size and magnetic properties of samples were investigated by XRD, TEM, VSM and M6ssbauer effect. The results show that the grain size of CoFe2O4 increases with the increasing of heating temperature, and the growth of CoFe2O4 grain is restricted effectively with the existence of amorphous SiO2. VSM results show that the saturation magnetization and coercivity of the samples increase with the increasing of the grain size. With the rise in treatment temperature, the samples transform from the superparamagnetic and magnetic order mixed state to an entire magnetic order state, which is confirmed by the Mosshauer effect.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2008年第3期144-148,共5页
Acta Materiae Compositae Sinica
基金
吉林省科技发展计划(20060803)
