Enhanced tracer self-diffusion coefficient in NaCl-Al2O3 composites

被引：0
|
作者：
Bénière, F [1 ]
Reddy, KV [1 ]
机构：
[1] Univ Rennes 1, GMCM, UMR 6626, F-35042 Rennes, France
来源：
RADIATION EFFECTS AND DEFECTS IN SOLIDS | 1999年 / 151卷 / 1-4期
关键词：
heterogeneous electrolytes; diffusion; electrical conductivity; composites;
D O I：
10.1080/10420159908245934
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
The comparison of the electrical conductivity measured in NaCl single crystals and in NaCl-Al2O3 composites, respectively, shows a strong enhancement due to the presence of the Al2O3 particles. The Na+. self-diffusion shows the same enhancement in the extrinsic range as well as in the intrinsic high temperature region. The correlation factor is derived from the Nernst-Einstein relation. The value f = 0.78 +/- 0.1 shows that the mass transport in the composite proceeds by the same mechanism as in the unmixed ionic crystals, i.e. via Schottky defects in NaCl. The Nernst-Einstein relation is closely verified by involving all the ions of the alkali halide phase, in contrast with the space charge model.
引用
收藏
页码：35 / 45
页数：11
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