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不同锆钛比铁铌锆钛酸铅热释电陶瓷的结构与性能

DOI: 10.14062/j.issn.0454-5648.2015.09.08

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Abstract:

研究了Zr/Ti摩尔比对两步法合成的0.3Pb(Fe1/2Nb1/2)O3–0.7Pb(ZrxTi1?x)O3(PFNZxT1-x)复合热释电陶瓷微观结构、相构成和综合电学性能的影响。结果表明,所制备的陶瓷样品均为单一钙钛矿结构。在x=0.50处出现四方、菱方相共存的准同型相界。随着Zr/Ti摩尔比增加(x从0.50增至0.95),逐渐从两相共存变为菱方相,同时伴随晶胞体积和陶瓷晶粒尺寸的不断增大。随x增加,体系介电常数减小,介电损耗变化较小,而体系热释电系数及优值呈现出逐渐增大趋势。当Zr/Ti摩尔比在富锆的80/20~85/15之间时,材料室温热释电系数p大于11×10?8C/(cm2·K1),探测率优值FD大于16×10?5Pa?1/2,具有较好的综合电学性能。

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