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中文摘要：
研究了A位非化学计量比对铌酸钾钠陶瓷极化程度的影响。采用固相反应法制备了0.96K0.5＋xNa0.5＋xNbO3-0.04LiSbO3系无铅压电陶瓷,通过建立钙钛矿结构的极化模型,研究了x取不同值时,外加电场、温度对陶瓷极化及压电性能的影响。研究结果表明：A位适当过量的铌酸钾钠陶瓷极化时,对温度和电场没有强烈依赖性,可以使极化足够充分,能有效提高铌酸钾钠基陶瓷的压电性能;相反,A位不过量的铌酸钾钠陶瓷极化对温度和电场敏感,容易击穿,极化不充分,降低了铌酸钾钠基陶瓷的压电性能。
英文摘要：
This paper studies the effects of A - site non - stoichiometry on polarization degree of K0. 5 Na0. 5 NbO3 - AgNbO3 lead - free piezoelectric ceramics. In the research, through the preparation of Lead - free piezoelectric 0. 96K0.5 ＋xNa0.5 ＋xNb03 -0.04LiSbO3 ceramics by solid state reaction and the building of polarization models of per- ovskite structure, effects of electric fields and different temperatures on the polarization and piezoelectric properties of ceramics are studied when x is at different values. Results show that the ceramics sample with the properly exces- sive A -site ions is not highly dependent on polarization temperature and electric field, which can realize effective polarization and improve the piezoelectric properties. On the contrary, the ceramics sample with normal A - site stoichiometry is sensitive to polarization temperature and electric field, easy to be broken down, resulting in ineffec- tive polarization and lowered piezoelectric properties.
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