中文摘要：

采用溶胶－凝胶方法制备了xCoAl0．2Fe1．8O4＋（1-x）BaTiO3纳米磁电复合材料．XRD图谱分析表明烧结后的样品是复合的钙钛矿（BaTiO3）和尖晶石（CoAl0.2Fe1.8O4）结构，SEM图像显示复合材料颗粒大小均匀．用磁滞同线研究了材料的磁性能，并通过Koops双层异质结构模型解释了复合材料的介电频散现象．测量结果表明：0．20CoAl0．2Fe1.8O4＋0．80BaTiO3的样品在偏置磁场为1．35×10^5A／m时表现出最大的磁电电压系数1．075×10^-1V／A．

英文摘要：

Magnetoelectric nano-composites xCoAl0.2Fe1.8O4＋（1-x）BaTiO3 were prepared by Sol-Gel method. The presence of perovskite BaTiO3 and spinel CoAl0.2Fe1.8O4 in the sintered composites was proved by XRD patterns. SEM images showed that particle size of composite was uniform. The magnetic property of composites was tested by magnetic hysteresis loops and dispersion of dielectric constant was explained with Koops two layer inhomogeneous dielectric structure model. The maximum value of magnetoelectric voltage coefficient viz. 1.075 × 10^-2V/A wasobtained for 0.20CoAl0.2Fel.8O4＋0.80BaTiO3 composite at the DC magnetic bias field of 1.35×10^5A/m.