Diffuse dielectric anomaly of （Na0.5K0.5Bi）0.5TiO3 crystal at high temperature  

作　　者：赵明磊 仪修杰 王春雷 王矜奉 张家良 

机构地区：[1]School of Physics and Microelectronics, Shandong University, Jinan 250100, China [2]College of Material Science and Engineering, Liaocheng University, Liaocheng 252059, China

出　　处：《Chinese Physics B》2006年第7期1611-1614,共4页中国物理B（英文版）

基　　金：Project supported by the National Nature Science Foundation of China （Grant No 50572056）.

摘　　要：This paper investigates the dielectric properties of （Na0.5K0.5Bi）0.5TiO3 crystal at intermediate frequencies （1kHz〈 f 〈IMHz） in the temperature range of 30-560℃. A pronounced high-temperature diffuse dielectric anomaly has been observed. This dielectric anomaly is shown to arise from a Debye-like dielectric dispersion that slows down following an Arrhenius law. The activation energy Er obtained in the fitting process is about 0.69eV. It proposes that the dielectric peak measured at low frequency above 400℃ is not related to the phase transition but to a space-charge relaxation.This paper investigates the dielectric properties of （Na0.5K0.5Bi）0.5TiO3 crystal at intermediate frequencies （1kHz〈 f 〈IMHz） in the temperature range of 30-560℃. A pronounced high-temperature diffuse dielectric anomaly has been observed. This dielectric anomaly is shown to arise from a Debye-like dielectric dispersion that slows down following an Arrhenius law. The activation energy Er obtained in the fitting process is about 0.69eV. It proposes that the dielectric peak measured at low frequency above 400℃ is not related to the phase transition but to a space-charge relaxation.

关 键 词：dielectric properties Debye relaxation SPACE-CHARGE 

分 类 号：O487[理学—固体物理]