中文摘要：

采用固相反应技术制备了铋掺杂（Ba1-xCax）0.925Bi0.05TiO3（x=0.10,Bi-BCT）和（Ba1-xSrx/2Cax/2）0.925Bi0.05TiO3（Bi-BCST）（x=0.10,Bi-BSCT）铁电陶瓷,研究了样品的结构、介电和铁电性能。结果表明：在Bi-BCT陶瓷中存在一种弥散的老化效应,点缺陷引起的可逆畴翻转机制能够合理地解释Bi-BCT陶瓷中异常的双电滞回线,这种机制有望进一步解释Bi-BSCT陶瓷中异常的介电行为。

英文摘要：

Structure,dielectric and ferroelectric properties of Bi doped（Ba1–xCax） 0.925Bi0.05TiO3（x = 0.10,Bi-BCT） and（Ba1–xSrx/2· Cax/2） 0.925Bi0.05TiO3（Bi-BCST） （x = 0.10,Bi-BSCT） perovskite ceramics prepared through a solid-state reaction technique were inves-tigated. Results show that there is a diffusional aging effect in Bi-BCT ceramics,and that point-defect-mediated reversible domain switching mechanism may be responsible for the double hysteresis loops observed in Bi-BCT ceramics. It is expected that the abnormal dielectric behavior of Bi-BSCT ceramics can be explained by a point-defect-mediated reversible domain switching mechanism.