CATION DIFFUSION IN FLUORITE SINGLE CRYSTALS

被引:38
作者
BAKER, M
TAYLOR, A
机构
[1] Department of Materials Science and Engineering, Cornell University, Ithaca
关键词
D O I
10.1016/0022-3697(69)90297-2
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Tracer diffusion of strontium in CaF2, SrF2 and BaF2 can be represented by the following equations DCaF2 = 1.72 × 105 exp ( -4.37 kT) (1000°-1200°C) DSrF2 = 1.09 × 104 exp ( -4.30 kT) (1000°-1200°C) DBaF2 = 4.45 × 103 exp ( -3.75 kT) (1000°-1200°C) Diffusion is probably due to some Schottky disorder in this range. The large values ofQ and Do could be explained in terms of excess impurity-induced anion vacancies and/or cation diffusion by means of associated vacancy pairs. © 1969.
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页码:1003 / &
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