Abstract： Spinel ferrite powders were prepared by citrate sol-gel method. The influence of sintering temperature and heating rate on particle size of ferrite was characterized by SEM and particle size analyzer. The results show that the multi-step temperature programmed mode is propitious to form ferrite powders with small size and high uniformity. The particle size of the product is about 300 nm. With the increase of temperature, the granularity of spinel ferrite decreases and then increases. The best sintering temperature is 850 ℃. It is suggested that multi-step heating is suitable for preparation of spinel ferrite powders with fine granularity and small particle size.

Keywords: ferrite; granularity; sintering temperature; heating rate

中图分类号：O614.8        文献标志码：A

文章编号：1008-5548(2015)02-0047-04

DOI:10.13732/j.issn.1008-5548.2015.02.012

收稿日期：2014-04-20， 修回日期：2014-06-08，在线出版时间：2015-04-17。

基金项目：甘肃省科技重大专项项目，编号：1203GKDD006。

第一作者简介：李颖（1983—），女，博士，高级工程师，主要从事无机金属标准物质的研究。 E-mail：liying-0427@163.com。