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铋掺杂对铌酸钾钠无铅压电陶瓷结构和性能的影响

DOI: 10.7521/j.issn.0454-5648.2014.05.18

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Abstract:

用常压烧结法制备铋掺杂铌酸钾钠无铅压电陶瓷(K0.5Na0.5)1-3xBixNbO3(KNBN)。研究不同铋掺杂量对KNN陶瓷结构、形貌、致密度及电学性能的影响。结果表明在1120℃烧结的含铋量为1%（摩尔分数）的陶瓷表现出最好的铁电和压电性能及较好的介电性能，即压电常数最大121pC/N，P-E回线形状达到饱和，且剩余极化为12.67μC/cm2，矫顽场Ec为13.58kV/cm，介电常数为575，损耗为5.82%(频率为1kHz)。陶瓷样品在131℃从正交结构转变到四方结构，Curie温度为400℃。

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