Diffusion of water and oxygen in quartz: reaction-diffusion model

被引：24

作者：

Doremus, RH ^{[1
]}

机构：

[1] Rensselaer Polytech Inst, Mat Sci & Engn Dept, Troy, NY 12180 USA

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 1998年 / 163卷 / 1-4期

关键词：

diffusion; quartz; water; oxygen; hydration;

D O I：

10.1016/S0012-821X(98)00173-3

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

A mechanism of diffusion of isotopically tagged water in crystalline quartz by molecular diffusion and network exchange is compared to previous experiments. Three experimental factors are explained by this mechanism. (1) The apparent diffusion coefficient is proportional to the fugacity of the water vapor in the gas phase. (2) The ratio of apparent diffusion coefficients at 800 degrees C in deuterium-hydrogen exchange to O-18-O-16 exchange is 4.7(10)(5). (3) Below 700 degrees C the measured diffusion coefficients become time dependent. This diffusion-exchange mechanism is valid for a wide variety of crystalline and amorphous oxides. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：43 / 51

页数：9

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