摘要
采用冷压陶瓷技术制备(Ba_(1-x)Ho_x)(Ti_(1-x)Ho_x)O_3(简称BHTH)陶瓷.通过X射线衍射(XRD)、电子顺磁共振(EPR)和介电温谱技术研究了BHTH陶瓷的结构、位占据和介电性质.结果表明:Ho^(3+)离子在BaTiO_3陶瓷中能够形成自补偿模式,且具有轻微的Ba位占据倾向.在BHTH陶瓷中,固溶度为x=0.03.BHTH陶瓷的介电行为表现出一个反常现象:随着x从0.01增至0.03,居里温度T_C向高温移动,即T_C从128℃升到131℃.BHTH晶体结构的四方度(c/a)随着x增加是T_C向高温移动的主要原因.
(Ba1-xHox)(Ti1-xHox)O3 ceramics(BHTH)were prepared using the cold-pressing ceramic technique.The structure,site occupations,and dielectric properties of BHTH were investigated using X-ray diffraction(XRD),electron paramagnetic resonance(EPR)and dielectric-temperature measuring techniques.The results indicated that Ho^3+ions in the BaTiO3 lattice could form a self-compensation mode with a slight Ba-site-occupation preference.The solubility limit was determined to be x=0.03 in BHTH.The dielectric behavior of BHTH showed an abnormal phenomenon,i.e.that the Curie temperature(TC)shifted towards high temperatures from 128℃at x=0.01 to 131℃at x=0.03.The increase in tetragonality(c/a)of the crystal structure of BHTH is the main reason of the increase in TC.
作者
高祥禄
路大勇
GAO Xianglu;LU Dayong(Research Center for Materials Science and Engineering,Jilin Institute of Chemical Technology,Jilin City 132022,China)
出处
《吉林化工学院学报》
CAS
2019年第3期74-77,共4页
Journal of Jilin Institute of Chemical Technology
基金
吉林省科技发展计划项目(20160101290JC)
关键词
钬掺杂钛酸钡
X射线衍射
自补偿模式
电子顺磁共振
介电性质
Ho-doped BaTiO3
X-ray diffraction
self-compensation
electron paramagnetic resonance
dielectric properties
