采用溶胶-凝胶法制备了0.15CoAl0.2Fe1.8O4-0.75BaTiO3纳米磁电复合材料.XRD分析表明,制备的样品中包含钙钛矿(BaTiO3相)和尖晶石结构(CoAl0.2Fe1.8O4相),没有其它明显杂相生成.扫描电镜表明,颗粒平均粒径约为45nm,且压磁相均匀分布于压电相中.研究了该纳米磁电复合材料在外加偏置静电场诱导下的介电常数随频率的变化,分析了直流偏置电场诱导下的相对介电常数变化值Δεr和调谐率K.随着偏置电场的增大,Δεr和K都变大;随着频率的增加,Δεr和K都减小.并且,在外加偏置电压为3kV/cm时可以获得相对较大的调谐率(4.05%).
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