柠檬酸溶胶凝胶法制备纳米Co1-xNixFe2O4铁氧体

Preparation of nanometers Co1-xNixFe2O4 ferrite by crtric acid sol-gel method

以柠檬酸作为分散剂，采用溶胶-凝胶法制备了纳米Co1-xNixFe2O4铁氧体。在实验过程中，探讨了Co-Ni的摩尔比，分散剂柠檬酸的量，干凝胶的煅烧温度及煅烧时间四个因素对产品性能的影响。并利用XRD、IR和TEM等测试手段对产品进行表征，分析了铁氧体粉体的徽观结构和形貌。结果表明：柠檬酸溶胶-凝胶法制备的Co1-xNixFe2O4铁氧体粒径小，分散均匀。当Co-Ni离子的摩尔比为0．5：0．5，铁酸盐与柠檬酸摩尔比为1：1，煅烧温度为1000℃，炷烧时间为1小时，可得到粒径在20nm左右的颗粒。IR和XRD分析证明了所得产品确实为Co（1-x）NixFe2O4铁氧体。

Nanometers Co1-xNixFe2O4 ferrite was prepared by sol-gel method using citric acid as dispersing agent. In this experiment, four factors, which were including the molar ratio of the Co to Ni, the dosage of citric acid, the calcining heat and the calcining time, were studied on their effect to the performance of products. The microstructure of Co1-xNixFe2O4 ferrite powder was characterized by XRD, TEM, IR and so on. The results show that uniform and small particle size Co1-xNixFe2O4 ferrite powders were obtained by the citric acid Sol-Gel method. The grain size of about 20 nm particles were obtained at optimum conditions. The optimum conditions were as follows: the molar ratio of Co to Ni was 0.5:0.5, the molar ratio of ferrite to citric acid was1: l, the calcining heat was 1000 , and the calcining time was 1 hour. The products were Co1-xNixFe2O4 ferrite according to the XRD and IR patterns.