POSITRON LIFETIME AND DEFECTS IN Y-DOPED (BA0.6SR0.4)TIO3 CERAMICS

被引:6
作者
TANG, CQ
ZHANG, DM
XUE, QZ
机构
[1] Department of Physics Huazhong, University of Science and Technology, Wuhan
关键词
D O I
10.1002/crat.2170300622
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
The positron lifetime spectra in Y-doped (Ba0.6Sr0.4)TiO3 ceramics have been measured at room temperature for Y contents of 0-0.8 at. %. It was found from the experiments that with increasing Y content, the variation of the positron lifetime parameters is nonmonotonic, and the Y content corresponding to the knee is about 0.7 at. %, which is much larger than the La content corresponding to the knee in the La-doped BaTiO2 (TANG 1994a). The experimental results show that the Y ions substitute predominantly for Sr ions, and this substitution induces a large number of Sr vacancies; when the Y content increases to about 0.7 at. %, the Y ions begin to substitute for Ba ions, and then the associated defects (2 YBaV ''(Sr)) and (2 YSrV ''(Ba)) form gradually.
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页码:837 / 841
页数:5
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