钨酸铅的频域和时域介电谱  

Frequency Domain and Time Domain Dielectric Spectroscopy of Yttrium-doped Lead Tungstate

作　　者：许华[1] 沈韩[2] 王卫林[1] 陈敏[2] 

机构地区：[1]宜春学院物理学系,江西宜春336000 [2]中山大学物理学系,广东广州510275

出　　处：《中山大学学报（自然科学版）》2003年第6期27-30,共4页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：江西省教育厅科技计划资助项目(2001387);广东省科技计划资助项目(C11102)

摘　　要：用时域和频域方法在0～150℃研究了掺杂Y的PbWO4单晶的介电谱。样品的复电导率和频率有关,故频域测量只能表示为导纳谱而不能将复电导率和复介电常数分开。自由弛豫时域测量中不出现外电场,故只给出用极化分量和响应时间表征的介电谱,而不受电导影响。这些极化分量和形成晶体闪烁发光中心的各种缺陷有关。Both time domain dielectric spectroscopy (TDDS) and frequency domain dielectric spectroscopy(FDDS) of PWO_4 single crystal are studied at temperatures from 0 to 150 ℃. Since complex conductivity of the sample varies with frequency, only total admittance spectrum can be obtained, but conduction can not be seperuted from dielectric effect based on frequency domain measurement.In the case of TDDS,time domain spectrum should not be affected by conduction effects without external electric field applied on the sample during the measurement. Each spectrum is divided into several components characterized by response time and dielectric constant. These components are ascribed to several kinds of defects in the crystal that form scintillation color centers.

关 键 词：钨酸铅 时域 介电谱 频域 PbWO4单晶 

分 类 号：O738[理学—晶体学] O482