纳米Co1-xZnxFe2O4/SiO2复合材料的结构和磁性

复合材料学报, 2010, 27(6): 126-129.

纳米Co1-xZnxFe2O4/SiO2复合材料的结构和磁性

华杰 ^1, , 李海波 ^2, , 刘梅 ^3, , 徐仕翀 ^4, , 刘宇 ^5,

1.吉林师范大学,凝聚态物理与材料科学研究所,四平,136000

2.吉林师范大学,凝聚态物理与材料科学研究所,四平,136000

3.吉林师范大学,凝聚态物理与材料科学研究所,四平,136000

4.吉林师范大学,凝聚态物理与材料科学研究所,四平,136000;哈尔滨工业大学材料科学与工程学院,哈尔滨,150001

5.吉林师范大学,凝聚态物理与材料科学研究所,四平,136000

基金项目: 吉林省科技发展计划项目(20090144)

关键词：铁氧体 , 复合材料 , 溶胶-凝胶法 , 磁性 , M(o)ssbauer效应

Structure and magnetic properties of nano Co1-xZnxFe2O4/SiO2 composites

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/SiO2(0≤x≤1)复合材料.利用XRD、TEM、VSM和M(o)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/SiO2复合材料中Co1-xZnxFe2O4/SiO2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/SiO2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.

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