Study of Alkali-Metal Vapor Diffusion into Glass Materials

• Kiminori Sato

Abstract

To investigate nanodispersion of alkali metals into glass materials, potassium vapor diffusion is conducted using SiO 2 glass under well-controlled temperature conditions. It is found that potassium vapor significantly diffuses into the bulk of SiO 2 glass with less precipitation on the surface when the host material is kept at a temperature slightly higher than that of the guest material. Positron annihilation spectroscopy reveals that angstrom-scale open spaces in the SiO 2 matrix contribute to potassium vapor diffusion. The analysis of potassium concentration obtained by electron probe microanalysis (EPMA) mapping with Fick's second law yields an extremely low potassium diffusion coefficient of 5.1×10 -14 cm 2 s -1 , which arises from the overall diffusion from open spaces of various sizes. The diffusion coefficient attributable to angstrom-scale open spaces is thus expected to be less than ∼10 -14 cm 2 s -1 . The present findings imply that angstrom-scale open spaces play an important role in loading alkali metals into glass materials.

Journal

• Japanese journal of applied physics : JJAP

  Japanese journal of applied physics : JJAP 52 (8), 086601-, 2013-08

  Tokyo : The Japan Society of Applied Physics

Keywords

• General Physics and Astronomy
• General Engineering

Details

• CRID: 1520853833142800768
• NII Article ID: 40019757415
• NII Book ID: AA12295836
• ISSN: 00214922
• ISSN: 13474065
• DOI: 10.7567/jjap.52.086601
• NDL BIB ID: 024785461
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I024785461
• Web Site: https://iopscience.iop.org/article/10.7567/JJAP.52.086601
• Web Site: https://iopscience.iop.org/article/10.7567/JJAP.52.086601/pdf
• Text Lang: en
• NDL Source Classification:
  • ZM35(科学技術--物理学)
• Data Source:
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN