纳米Co_(1-x)Zn_xFe_2O_4/SiO_2复合材料的结构和磁性  

Structure and magnetic properties of nano Co_(1-x)Zn_xFe_2O_4/SiO_2 composites

作　　者：华杰[1] 李海波[1] 刘梅[1] 徐仕翀[1,2] 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,四平136000 [2]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《复合材料学报》2010年第6期126-129,共4页Acta Materiae Compositae Sinica

基　　金：吉林省科技发展计划项目(20090144)

摘　　要：为了研究Zn2+含量对CoZn铁氧体结构和磁性的影响,以正硅酸乙酯和硝酸盐为原料,用溶胶-凝胶法制备了纳米Co1-xZnxFe2O4/Si O2(0≤x≤1)复合材料。利用XRD、TEM、VSM和M ssbauer效应分析了样品的结构、形貌和磁性。结果表明,经900℃热处理后,Co1-xZnxFe2O4/Si O2复合材料中Co1-xZnxFe2O4为晶粒分布均匀的尖晶石铁氧体结构。Zn2+替代Co2+后引起Co1-xZnxFe2O4晶格膨胀。随Zn2+含量的增加,样品的矫顽力减小,而比饱和磁化强度先增大后减小,样品从磁有序状态转变为顺磁状态。Zn2+的掺杂对Fe3+核处的s电子密度有较大的影响,对尖晶石结构对称性影响较小。Nano Co1-xZnxFe2O4/SiO2（0≤x≤1） composites were prepared by sol-gel method using teterathylor-thodilicate and nitrates as precursor in order to investigate the effect of Zn2＋ content on the structure and magnetic properties of composites.The structure,morphology and magnetic properties of the composites were investigated by XRD,TEM,VSM and Mssbauer effect.The results show that Co1-xZnxFe2O4 grains distribute uniformly in nano Co1-xZnxFe2O4/SiO2 composites and present cubic spine structure.The unit cell of Co1-xZnxFe2O4 expands after Zn2＋ substituting Co2＋.With the increasing of Zn2＋ content,the coercivity of the composites decreases,and the value of saturation magnetization increases firstly then decreases,while the composites transform from magnetic order state into paramagnetic state.The doping of Zn2＋ has more effect on the density of s-electron around Fe3＋ nucleus,less effect on structural symmetry.

关 键 词：铁氧体 复合材料 溶胶-凝胶法 磁性 Mssbauer效应 

分 类 号：O482.5[理学—固体物理]