高锂含量碱金属铌酸盐的结构与性能研究
Piezoelectrics and Acoustooptics（2007）
Abstract
采用传统固相法陶瓷制备工艺制得高锂铌酸基无铅压电陶瓷体系xLiNbO3-(1-x)(Na0.5K0.5)NbO3(简写为xLN-(1-x)NKN,其中x=0.146,0.236,0.292,0.348,0.361,0.382,0.438,0.472,0.500,0.528,0.618),研究了该体系的晶相结构,断面形貌及电学性能随x的变化.研究表明,随x的增加,样品主晶相有一个四方钙钛矿到四方钨青铜结构再到LiNbO3三方结构的过程;压电常数d33随着x的增加而减小,但在x=0.236～0.438时保持相对稳定,约为75～80 pC/N;当x=0.5时,居里温度Tc为537℃,此系列陶瓷适用于高温环境的压电陶瓷.
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