Co0.8Zn0.2Fe2O4/SiO2纳米复合材料的结构和磁性  

STRUCTURE AND MAGNETIC PROPERTIES OF Co_(0.8)Zn_(0.2)Fe_2O_4/SiO_2 NANOCOMPOSITES

作　　者：李海波[1] 华杰[1] 刘梅[1] 张玉梅[1] 刘宇[1] 

机构地区：[1]吉林师范大学,凝聚态物理与材料科学研究所,吉林四平136000

出　　处：《硅酸盐学报》2010年第6期1048-1052,共5页Journal of The Chinese Ceramic Society

基　　金：吉林省科技发展计划基金(20060803)资助项目

摘　　要：用溶胶–凝胶法制备Co0.8Zn0.2Fe2O4/SiO2纳米复合材料。用X射线衍射、透射电镜、振动样品磁强计和Mssbauer效应研究不同温度热处理样品的结构、晶粒尺寸、磁性和离子占位情况。结果表明:随热处理温度的升高,样品中Co0.8Zn0.2Fe2O4晶粒的尺寸变大并伴随晶格收缩。随着Co0.8Zn0.2Fe2O4晶粒尺寸的增加,样品的比饱和磁化强度和矫顽力增强,内磁场增加,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。在Co0.8Zn0.2Fe2O4纳米晶粒中,Zn2+的占位情况和块体尖晶石铁氧体的不同。Nanocomposites Co0.8Zn0.2Fe2O4/SiO2 were synthesized by the sol–gel method. The X-ray diffraction,transmission electron microscope,vibrating sample magnetometer,and Mssbauer spectroscopy were employed to characterize structure,crys-talline sizes,magnetic properties,and cation distribution of samples treated at different temperatures. The results indicate that raising the heat-treat temperature increases the grain sizes of spinel Co0.8Zn0.2Fe2O4,and the unit cell of spinel phase has the trend of contraction. With the increase of crystalline sizes,the coercivity,saturation magnetization and hyperfine magnetic field of the samples increase correspondingly and the samples transfer from mixed state of superparamagnetic and magnetic order to the com-pletely magnetic order. The site preference of Zn2＋ in Co0.8Zn0.2Fe2O4 nanocrystal is different from that of bulk material.

关 键 词：钴锌铁氧体 纳米复合材料 结构 磁性 Mssbauer效应 

分 类 号：O482.5[理学—固体物理]