采用传统固相法工艺制备了(1－x )Bi (Mg1/2 Ti1/2)O3-xPbTiO3(BMT-xPT,0．34≤x≤0．44)陶瓷。研究发现,随着PT含量增加,试样结构由三方相逐渐转变为四方相结构,当0．36＜x＜0．40时,试样结构处于准同型相界(MPB)区。研究表明 BMT组元是一种具有非铁电体特征的组分,随着 PT 含量减少,BMT-PT体系的居里温度减小,介电峰变得越来越不明显。通过研究 BMT-PT 体系组分与居里温度(TC)的关系可以看出：(1)PT 含量为0．34~0．44时,TC 随BMT含量变化实验值和 Stringer 的经验值差异较小,变化趋势一致；(2)BMT-PT 体系居里温度最大值可能在 x＝0．73的附近,其居里温度最大值TC max约为550℃。
(1-x)Bi(Mg1/2 Ti1/2 )O3-xPbTiO3 (BMT-xPT,0.34≤x≤0.44)ceramics were prepared by conven-tional powder-processing method.With PT content increasing,a phase transition from the rhombohedral phases to tetragonal phases was observed,and when PT content was between 0.36 and 0.40,the morphotropic phase boundary (MPB)composition was investigated.With PT content decreasing,the value of TC was deceasing;meanwhile the dielectric peak becomes unobvious,indicating that BMT was not a ferroelectrics composition. Finally,it can be found that the change of experimental value was accord with the value of Stringer’s report for 0.34≤x≤0.44.Thus,it can infer that the maximum TC was around x=0.73 for BMT-xPT system,which was about 550 ℃.
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