par May, Bronislav Henri ;Wollast, Roland
Référence Journal of the American Ceramic Society, 57, 1, page (30-34)
Publication Publié, 1974
Article révisé par les pairs
Résumé : Chemical diffusion coefficients for Si were measured in potassium silicate compositions containing from 64 to 85 wt% SiO2; unidirectional diffusion couples were heated for 0.1 to 720 h at 600° to 1400°C. The diffusion coefficients, which were calculated by the Boltzmann‐Matano method, are described for a silicate containing 70 wt% SiO2 by: (Formula Presented.) The diffusion coefficients decreased with increasing O2 pressure. Below 800°C, the coefficients decreased with increasing SiO2 concentration; above 800°C, their dependence on SiO2 concentration was too weak to detect by the methods used. On the basis of a simple structural model for the glass, it was possible, from a phenomenological analysis of the diffusion, to establish a relation between the oxygen self‐diffusion coefficient and the chemical diffusion coefficient for a given composition. Copyright © 1974, Wiley Blackwell. All rights reserved