弛豫铁电体微畴-宏畴转变稳定性的一种新判据  

A New Ruler of Microdomain macrodomain Transition in Relaxor Ferroelectrics

作　　者：张栋杰[1] 程忠阳[1] 张良莹[1] 姚熹[1] 

机构地区：[1]西安交通大学电子材料与器件研究所

出　　处：《压电与声光》1998年第6期414-418,共5页Piezoelectrics & Acoustooptics

摘　　要：利用铅基弛豫铁电体的局域冻结模型和Ｖｏｇｅｌ－Ｆｕｌｃｈｅｒｇ模型，求出了铅基弛豫铁电体的活化能、频率因子和冻结温度。并在此基础上提出了动态跃迁频率作为微畴－宏畴转变稳定性的新判据。动态跃迁频率越小，微畴向宏畴转变越困难，即微畴越稳定。此判据同时考虑了动力学因素和活化能，具有普适性。The activating energies、frequency factors and freezing temperatures were obtained in Pb based complex perovskite relaxor ferroelectrics of PMN and PZN by using partial freezing glass model and Vogel Fulcherg model. A new stable ruler of jump frequency was raised during microdomain macrodomain transition. The smaller jump frequency is , the more difficult the microdomain macrodomain transition is and the micro domain is more stable. The kinetic factor and activating energy E a were considered in the jump frequency temperature equation, so the ruler has generality.

关 键 词：弛豫铁电体 微畴-宏畴 玻璃模型 

分 类 号：TM221.013[一般工业技术—材料科学与工程]