一种铌镁酸铅-钛酸铅晶体的铁电相变研究  

Study of a Phase Transition of Crystal in the PMN PT System

作　　者：张磊[1] 彭毅萍[1] 钟维烈[1] 张沛霖[1] 罗豪苏 徐海青 殷之文 

机构地区：[1]山东大学物理系 [2]上海硅酸盐研究所

出　　处：《压电与声光》1999年第2期136-139,共4页Piezoelectrics & Acoustooptics

摘　　要：研究了Ｐｂ（Ｍｇ１／３Ｎｂ２／３）Ｏ３－ＰｂＴｉＯ３晶体的介电、热电和压电性质，温度测量范围为７０Ｋ～６００Ｋ。发现它不仅在４７４Ｋ附近有一铁电－顺电相变，而且在１８０Ｋ附近还存在一个铁电－铁电相变。在相变温度区域里，介电、热电和压电都有明显的热滞效应，具有一级相变特性。The dielectric,pyroelectric and piezoelectric properties of the Pb(Mg 1/3 Nb 2/3 )O PbTiO 3 crystal were studied,in the temperature range from 70 K to 600 K.The measurement shows that a paraelectric ferroelectric transition exists near 474 K,and a ferroelectric ferroelectric transition exists near 180 K.Near the transition temperature,a thermal hysteresis was found in dielectric,pyroelectric and piezoelectric measurements.Thus the transition should be of the first order transition.

关 键 词：压电晶体 相变 热滞效应 电容率 热释电性 

分 类 号：O738[理学—晶体学] TM22[一般工业技术—材料科学与工程]