Self-diffusivity of iron in alkali-lime-alumosilicate glass melts

被引:28
作者
Gerlach, S [1 ]
Claussen, O [1 ]
Russel, C [1 ]
机构
[1] Univ Jena, Otto Schott Inst, D-07743 Jena, Germany
关键词
D O I
10.1016/S0022-3093(98)00704-2
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
Self-diffusion coefficients of iron were measured in glass melts with the basic mol% composition of 16 R2O, 10 CaO, x Al2O3 and (74 - x) SiO2 with x = 0, 5, 10, 15 and R = Li, Na, K and Cs in the temperature range of 900-1300 degrees C using square-wave voltammetry. All diffusion coefficients had an Arrhenian dependence which depended on the type of alkali present and the Al2O3-concentration. Larger alkali cations, e.g. Cs+, as well as an increase in the Al2O3-content led to a decrease in the diffusion coefficients and also to an increase in viscosity. Within one glass composition, the Stokes-Einstein equation is fulfilled with respect to the dependence of the diffusivity upon viscosity. At constant viscosity, however, increasing size of the alkali cation and increasing Al2O3-content led to larger iron diffusion coefficients. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:110 / 117
页数:8
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