复相多铁材料xCoFe_2O_4/(1–x)BaTiO_3的制备及性能  

Preparation and Properties of xCoFe_2O_4/(1–x)BaTiO_3 Multiphase Magnetoelectric

作　　者：李亚[1] 代建清[1] 张瑞浩[1] 程振宇[1] 王志翔[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《硅酸盐学报》2016年第4期588-594,共7页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51162019;51462019)

摘　　要：采用固相合成法分别制备了尖晶石结构Co Fe_2O_4和钙钛矿结构Ba Ti O_3粉末,烧结得到x Co Fe_2O_4/(1―x)Ba Ti O_3(x=0.2,0.4,0.6,0.8)复相多铁材料,对材料的成分、介电性能、铁电性、磁性能进行了表征。结果表明:当x=0.2时所得的复相多铁材料两相共存,无杂相,而其他组分均不同程度地存在杂相。复相多铁材料x Co Fe_2O_4/(1―x)Ba Ti O_3具有铁电性和铁磁性,且性能受铁磁相含量影响明显。随铁磁相组分增加,材料介电常数变小,漏电流增大,铁电性能变差;同时,铁磁相间颗粒接触面积增大,磁化作用得到加强,材料磁性能得到提升。The multiferroic composite material xCoFe2O4/（1–x）BaTiO3 was prepared using spinel structure CoFe2O4 powder and perovskite structureBaTiO3 powder synthesized by a solid oxide reaction method. The components, dielectric property, ferroelectricity and magnetic property of the composite material were characterized. The results show that, when x is 0.2, the composite material consist of CoFe2O4 and BaTiO3 without impurity phase detected. The composite material demonstrates the ferroelectric and ferromagnetic behaviors, and its performance is affected by the content of ferromagnetic CoFe2O4. When the ferromagnetic component increases, the dielectric permittivity decreases, the leakage current increases, and the ferroelectricity degrades; meanwhile, the increase of ferromagnetic component increases the contact area of ferromagnetic particles, and enhances the magnetization and the magnetic property.

关 键 词：铁酸钴 钛酸钡 铁电性 磁性能 多铁性 

分 类 号：TQ174.75[化学工程—陶瓷工业]