以柠檬酸溶胶-凝胶自蔓延燃烧法合成了NiFe2O4纳米粉体.利用XRD技术研究了自燃烧粉体经不同温度热处理后的物相变化规律,采用SEM、TEM、IR技术对自燃烧粉体与热处理粉体进行了表征,对比研究了两者在2～18GHz内的电磁参数及损耗特性.结果表明,自燃烧粉体以NiFe2O4为主晶相,其中有少量FeNi3与α-Fe2O3杂相,随着热处理温度升高,杂相分别于600与950℃相继消失.热处理有效推动了晶界移动,实现晶粒长大.自燃烧粉体中的FeNi3相、畸变的晶体结构以及复杂的界面状况使得其较热处理样品具有特殊的红外吸收谱图与优越的电磁损耗特性.
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