Observation of dipole complexes in PbWO4:La3+ single crystals

被引：80

作者：

Han, BG ^{[1
]}

Feng, XQ ^{[1
]}

Hu, GQ ^{[1
]}

Wang, PC ^{[1
]}

Yin, ZW ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, Lab Funct Inorgan Mat, Shanghai 200050, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 1998年 / 84卷 / 05期

关键词：

D O I：

10.1063/1.368423

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The frequency dependence of dielectric loss factor (tan delta) in undoped and La-doped PbWO4 crystals has been investigated over a frequency range from 10 Hz to 10 MHz and a temperature range from 40 to 370 degrees C. A typical dielectric relaxation phenomenon in PbWO4:La3+ has been observed. Experimental results indicate that there exist intrinsic mobile defects in pure PbWO4 crystals and lead vacancies are the predominant mobile defects. In La-doped PbWO4 crystals, La3+ ions may be located at the Pb2+ sites and combine with lead vacancies to form the dipole complexes [2(La-Pb(3+))(.-) V"(Pb)] which may be the origin of the dielectric relaxation phenomenon in PbWO4:La3+ crystals. (C) 1998 American Institute of Physics. [S0021-8979(98)08317-0].

引用

页码：2831 / 2834

页数：4

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