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

页码：2845 / 2848

页数：4

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