Secondary ion mass spectroscopy study of oxygen-18 tracer diffusion in 2/1-mullite single crystals

被引：31
|
作者：
Fielitz, P
Borchardt, G
Schmücker, M
Schneider, H [1 ]
Wiedenbeck, M
Rhede, D
Weber, S
Scherrer, S
机构：
[1] Deutsch Zentrum Luft & Raumfahrt, Inst Werkstoff Forsch, D-51147 Cologne, Germany
[2] Tech Univ Clausthal, Inst Met, D-38678 Clausthal Zellerfeld, Germany
[3] Geoforschungszentrum Potsdam, D-14473 Potsdam, Germany
[4] Ecole Mines, F-54052 Nancy, France
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2001年 / 84卷 / 12期
关键词：
D O I：
10.1111/j.1151-2916.2001.tb01103.x
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Oxygen O-18 tracer diffusion in Czoehralski-grown mullite single crystals is investigated along [010] and [001]. Oxygen diffusion coefficients range between similar to5 x 10(-20) m(2)/s (1250 degreesC) and similar to9 x 10(-18) m(2)/s (1525 degreesC). The data does not show any significant anisotropy. The values of the activation enthalpy (4.5 eV) and of the activation entropy ((3.4 +/- 1.6)k(B), where k(B) is the Boltzmann constant) suggest that the atomic transport occurs via thermally activated vacancies.
引用
收藏
页码：2845 / 2848
页数：4
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