水热法制备NiFe_2O_4-BaTiO_3复合材料及其电-磁性能  

Electric and Magnetic Properties of NiFe_2O_4-BaTiO_3 Composites Synthesized by Hydrothermal Method

作　　者：刘倩[1] 吕丽[1] 王燕[1] 肖瑞娟[1] 陈晓明[1] 周剑平[1] 刘鹏[1] 宋永红[2] 

机构地区：[1]陕西师范大学物理学与信息技术学院,西安710062 [2]陕西师范大学化学化工学院,西安710062

出　　处：《硅酸盐通报》2012年第1期50-55,共6页Bulletin of the Chinese Ceramic Society

基　　金：教育部新世纪优秀人才支持计划(NCET-10-0536);中央高校基本科研业务费专项资金(GK200901018);陕西师范大学研究生培养创新基金(2011CXS047)

摘　　要：本文利用水热法以铁酸镍和钛酸钡为原料,制备了具有尖晶石结构的铁酸镍(NiFe2O4)和钙钛矿结构的钛酸钡(BaTiO3)复合材料,利用X射线衍射(XRD)和扫描电镜(SEM)对样品的物相和形貌进行了分析。研究了复合样品的介电常数和磁导率随频率和温度的变化。结果表明:复合样品中的钛酸钡在烧结后由四方相转变成六角结构;生成六角结构的钛酸钡颗粒和类球状铁氧体颗粒;介电常数和磁导率随铁氧体含量的增加逐渐增大,复合陶瓷的介电居里温度随铁氧体含量的增加向低温方向移动,磁性居里温度随铁氧体含量的增多向高温方向移动,逐渐接近铁氧体的居里温度。In the present work,the magnetoelectric composites of spinel structure NiFe2O4 and perovskite structure BaTiO3 were synthesized by hydrothermal method with putting the precursor of NiFe2O4 and BaTiO3 together in reaction kettle.The presence of two phases in composites was confirmed by XRD technique.The microstructure was characterized by scanning electron microscope.The variation of dielectric constant and variation of permeability with frequency and temperature were studied.The results showed that the structure of BaTiO3 in the composite changed from tetragonal structure to hexagonal structure,hexagon shaped BaTiO3 particles and near-spherical particles were formed,both of dielectric constant and permeability increased with increasing NiFe2O4 contents,the ferroelectric curie temperature moved towards low temperature with increasing NiFe2O4 contents,while the ferromagnetic curie temperature moved towards high temperature,which was close to that of NiFe2O4.

关 键 词：水热法 磁导率 居里温度 介电常数 

分 类 号：TM282[一般工业技术—材料科学与工程]