采用X射线粉晶衍射分析及透射电镜选区电子衍射分析技术等手段,研究了(1-x)BaTiO3-x Bi0.5 Na0.5 TiO3(x≤0.4)固溶体陶瓷的晶相组成及晶体结构特征,并对陶瓷性能特征进行了讨论.研究表明,固溶体的晶体结构受BNT含量的显著影响.X射线衍射分析表明,经1250 ℃烧结2 h的陶瓷形成了钙钛矿结构固溶体.选区电子衍射分析表明,该固溶体并非单一晶相,其晶相类型包括四方相和立方相,并存在局部结构畸变现象.陶瓷的相变温度随BNT含量的增高而变化,居里温度增高,次级相变向低温移动,并最终消失.当BNT含量为20%～40%(摩尔分数)时,陶瓷具有较好的铁电性,其居里温度为146～182 ℃,介电损耗为0.030～0.042,并在-60～110 ℃以上较宽的范围内具有良好的介电稳定性.
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