溶胶-凝胶法制备CoFe_2O_4/SiO_2纳米复合粉末  

CoFe_2O_4/SiO_2 Nanocomposites Prepared by the Sol-gel Method

作　　者：陈敬艳[1] 孟祥东[1] 华杰[1] 宗占国[1] 李海波[1] 

机构地区：[1]吉林师范大学物理学院,吉林四平136000

出　　处：《吉林师范大学学报（自然科学版）》2005年第3期107-108,共2页Journal of Jilin Normal University:Natural Science Edition

基　　金：吉林省杰出青年科学研究计划吉林大学超硬国家重点实验室资助项目

摘　　要：以正硅酸乙酯和金属硝酸盐为原料,采用溶胶-凝胶法制备了(CoFe2O4)z/SiO2(1-x)纳米复合材料.利用热重/差热综合热分析仪(TG/DTA)研究了热处理过程中干凝胶的变化.使用X射线衍射仪(XRD)分析了(CoFe2O4)x/SiO2(1-x)纳米复合粉末的结构和晶粒尺寸.结果表明热处理后的样品中同时存在非晶态SiO2和晶态CoFe2O4,当x≥0.5时,出现少量的Fe2O3杂相.随着热处理温度的升高,样品的晶粒尺寸逐渐变大.CoFe2O4/SiO2 nanocomposites were prepared by the sol- gel method using tetraethylorthosilicate and metallic nitrates as raw materials. The changes of gels during heat treatment were studied by TG/DTA. The structure and crystalline size of CoFe2O4/SiO2 nanocomposites were detected by XRD. The results showed that there were an amorphous character SiO2 and a crystalline state CoFe2O4 and for x≥10.5 samples had small amounts of Fe2O3. The crystalline size increased with the increase in heating temperature.

关 键 词：溶胶-凝胶法 CoFe2O4/SiP2 纳米复合粉末 

分 类 号：TF123.7[冶金工程—粉末冶金]