Title

Sodium Diffusion in Glass: I, Single-Alkali Silicate

Abstract

The isotope effect for 22Na/24Na diffusion was measured for three 25-mol% alkali-silicate glasses. A multiple diffusion mechanism wherein the Na ions diffuse both singly (vacancy mechanism) and in pairs (interstitialcy mechanism) provided the best agreement with the experimental data. According to this tentative model, diffusion by Na ion pairs predominates at low temperatures, and the fraction of Na ions diffusing singly increases with increasing temperature. In the glasses investigated, nearly all of the Na ions diffuse singly in the vicinity of the transformation range.

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

27820

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1977 Wiley-Blackwell, All rights reserved.

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