用溶胶-凝胶制备了系列Ni0.4Mn0.3Zn03Fe2O4铁氧体微粉.借助于TG-DTA、XRD、TEM、VSM和PNA技术,对干凝胶的热分解过程、产物的物相、微观结构、磁性和介电常数进行研究.结果表明,反应温度为30℃,前驱体在1000℃烧结转变成尖晶石相,但仍然有Fe2O3相存在,无法获得纯的Ni0.4Mn0.3Zn0.3Fe2O4铁氧体微粉.另外,由于杂质粒子的存在和晶粒表面结构缺陷,粉体样品在室温出现交换偏置场.块状样品随着煅烧温度的提高,电阻率和介电常数减小.
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