研究了La3+取代的(Bi1.5Zn0.5)(Ti1.5Nb0.5)O7基陶瓷(Bi1.5-xLaxZn0.5)(Ti1.5Nb0.5)O7(0.0≤x≤1.2,BLZNT)的结构与介电性能.采用传统的固相反应法制备了陶瓷样品,用XRD、SEM分析了样品的组织.在整个取代范围内,La3+取代的样品基本保持单一烧绿石相,稳定范围由容忍因子(RA/RB值)来确定;同时,随着La3+取代量的增加,晶胞常数先增后减.介电性能随结构变化而变化,其中介电性能为:ε=130～170,tanδ= ～0.9×10-3(1MHz),并且掺杂La优化了BLZNT-x样品高频端(＞100 kHz)的频谱特性.
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