PZT5/(Mg_(0.5)Zn_(0.5))Fe_2O_4复合材料的电磁性能

Ferroelectric and Ferromagnetic Properties of PZT5/(Mg_(0.5)Zn_(0.5))Fe_2O_4 Composites

以PZT5和(Mg0.5Zn0.5)Fe2O4为原料,合成了不同配比的铁电/铁磁复相材料。XRD和SEM研究结果表明复相材料中只含有钙钛矿结构的PZT5和尖晶石结构的(Mg0.5Zn0.5)Fe2O4,无杂相生成,这说明共烧过程中两者没有发生明显的化学反应。介电频谱表明,相对介电常数随PZT5含量的增加而增加(测试频率在30MHz以下),介电温谱表明,居里温度随频率升高而向高温移动(其值分别为250,300,326,372℃)。电滞回线呈现了材料的漏电流较大的特点。磁滞回线表明,这种复相材料具有亚铁磁性,饱和磁化强度随铁氧体含量的增加而增加。性能测试表明,这种由PZT5和(Mg0.5Zn0.5)Fe2O4共同组成的复相材料对外同时表现出铁电性和铁磁性。

A series of Ferroelectric and Ferromagnetic composites were synthesized by the conventional solid-state route using PZT5 and （Mg0.5Zn0.5）-Fe2O4 as starting materials. XRD and SEM studies indicated that the composites comprised of PZT5 phase with perovskite structure and （Mg0.5Zn0.5）Fe2O4 phase with spinel structure, no any impurity phase existed. Dielectric constant increased with increasing of PZT5 content under 30 MHz. The Curie temperature was shifted to higher temperature side with increasing of frequency （250, 300, 326, 372 ℃）. The magnetic hysteresis loop showed that the composites had ferrous magnetic properties. The saturation magnetization increased with increasing of （Mg0.5Zn0.5）-Fe2O4 content. These test properties showed that the composites exhibited both ferroelectric and ferromagnetic properties.