Effect of water incorporation on the diffusion of sodium in Type I silica glass

Lei Tian, Rüdiger Dieckmann, Chung Yuen Hui, Yu-Yun Lin, J. Greg Couillard

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17 Citations (Scopus)

Abstract

The diffusion of sodium ions in Type I silica glass was studied experimentally by using Na-22 as a radioactive tracer at temperatures between 400°C and 700°C. It was found that the sodium tracer diffusion coefficient in as-received glass was well described by an Arrhenius equation. All residual radioactivity profiles observed after pre-annealing glass samples in common and wet air at temperatures between 900°C and 1100°C and performing diffusion anneals at 650°C cannot be described by a single diffusion coefficient. A strong residual radioactivity decrease occurred near the surface, which was followed by a much smaller decrease in the bulk below. This type of profile was attributed to the generation of a near-surface region with a reduced sodium mobility during the pre-annealing. A mathematical model for the analysis of the observed profiles was developed and used to determine sodium tracer diffusion coefficients in the near-surface region and in the bulk. It was found that the sodium tracer diffusion coefficient in the near-surface region was by about two orders of magnitude smaller than that in the bulk. This immobilization of Na is believed to be due to a water-induced structural relaxation in the near-surface region during pre-annealing.

Original languageEnglish
Pages (from-to)146-161
Number of pages16
JournalJournal of Non-Crystalline Solids
Volume286
Issue number3
DOIs
Publication statusPublished - 2001 Jul 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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