摘要
XRD法分析和介电测量结果表明,SAG法Ba1-xSrxTiO3(x=0、0.3、0.5和0.7)微粉和陶瓷的室温结构为立方相.其居里温度明显低于相应Ba1-xSrxTiO3晶体或常规工艺陶瓷的值,但居里温度仍随着Sr2+含量的增加而线性下降.晶粒含杂质Fe3+以及表面富钡可能使其晶格立方化,从而使居里温度下降以及三方-正交和正交-四方铁电相变消失.
Ba1-xSrxTiO3 (x = 0, 0. 3, 0. 5 and 0. 7)were synthesized by the SAG method. The XRD analysis showed that they had a cubic structure at room temperature. The Curie temperature was measured by the temperature dependence of dielectric permittivity. Although it decreases linearly with increasing Sr content, it is obviously lower than the corresponding ceramics made by conventional method. The lowering of Curie temperature and disappearance of the trigonal-orthorhombic and orthorhombic-tetragonal phase transition might be caused by the impurity Fe3+ and the excess of Ba at the grain surface.
出处
《山东大学学报(自然科学版)》
CSCD
1996年第1期110-114,共5页
Journal of Shandong University(Natural Science Edition)
基金
中科院无机功能材料开放实验室的资助
关键词
钛酸锶钡
介电性
铁电相变
SAG法
铁电体
barium strontium titanate
dielectric properties
ferroelectric phase transition