期刊
MATERIALS LETTERS
卷 59, 期 14-15, 页码 1941-1944出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2005.02.031
关键词
non-stoichiometric ferrite; sol-gel preparation; heat treatment; iron deficiency
Non-stoichiometric Ni0.5Zn0.5Fe2-xO4-3/2x, ferrites over a wide range of x=0 similar to 0.8 are synthesized by a sol-gel processing. Phase evolution, crystal structure and crystallite size of spinel ferrites are dependent on annealing temperature and the amount of Fe deficiency. The crystallite size of spinel increases with annealing temperature and grows faster in stoichiometric ferrites than that of non-stoichiometric. Fe deficiency results in the partial reduction of spinet ferrite to zincite ZnO. XRD indicates that the crystallization temperature of ZnO is increased to about 700 degrees C. Zincite reduces the number of ferrite crystallites and disfavors the growth of spinet fertites. The lattice parameters decrease with Fe deficiency and are insensitive to the variation in composition in the samples annealed at lower temperature due to the segregation of ZnO and lattice expansion in the ultrafine crystallites. (c) 2005 Elsevier B.V All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据