扩散阻挡法制备铁酸钴/锆钛酸铅0-3复合材料及性能研究  

Fabrication and properties of cobalt ferrite/lead lanthanum zirconate titanate 0-3 composites via modifying phase boundary

作　　者：施东良[1] 李坤[1] 李海[1] 王强[1] 王雨[2] 陈王丽华[2] 

机构地区：[1]常州大学材料学院,江苏常州213164 [2]香港理工大学应用物理系,香港999077

出　　处：《功能材料》2012年第B11期326-330,共5页Journal of Functional Materials

摘　　要：通过溶胶-凝胶工艺在铁酸钴(CoFe2O4,CFO)陶瓷粉体表面包覆二氧化锆,形成核壳结构。以钨酸锂Li2WO3作为铁电相锆钛酸铅镧(PLZT)的烧结助剂以降低烧结温度。将两种粉体混匀,经成型和共烧工艺制备了xCFO/(1-x)PLZT 0-3复合多铁性陶瓷(质量分数x为0.1、0.2、0.3、0.4)。研究了铁磁相含量、陶瓷的晶相结构、微观形貌以及烧结工艺条件对陶瓷介电、压电、铁电性能的影响。X射线衍射分析表明,复合多铁性陶瓷样品保持了较纯净的钙钛矿(PLZT)和尖晶石(CoFe2O4)结构。扫描电镜形貌分析和能谱分析显示复合材料的两相分布均匀,氧化锆成功包覆在铁磁相CoFeO4颗粒表面,且二氧化锆大大减少了高温下铁、钴离子的扩散。当磁场频率为10kHz时,1100℃烧结的CFO/PLZT复合陶瓷(x=0.2)的磁电转换系数约为3.53×106mV/(T.cm)。The cobalt ferrite （CFO） powders were coated with zirconia via sol-gel methods to form core-shell structures. The Li2 WO3 was used as sintering additives to decrease the sintering temperature of the lead lantha- num zirconate titanate （PLZT）. Two kinds of powder were well mixed and then pressed to form raw disks. After being co-fired at designed temperature, the xCFO/（1-x）PLZT 0-3 multi-ferroic composites （x=0.1, 0.2, 0.3, 0.4 in weight fraction） were obtained. The effects of the CFO content, phase structure, micro morpholo- gy and sintering conditions on the dielectric, piezoelectric and ferroelectric properties were investigated. The X- ray diffraction patterns showed that the composites presented a pero,：skite structure and a spinel structure of CFO. The SEM micro morphology and energy dispersive spectrometer results showed that the CFO particles were well dispersed in PLZT, the ZrO2 was well coated on the CFO surface and effectively blocked the diffusion of iron and cobalt ions into the PLZT. The magneto-electric coefficient of the CFO/PLZT composite ceramics （x=0.2） which were sintered at 1100℃ was found to be 3.53×106mV/（T · cm） at 10kHz.

关 键 词：磁电复合材料 溶胶-凝胶法 磁电转换系数 核壳结构 

分 类 号：TM277[一般工业技术—材料科学与工程]