Concentration-dependent diffusivity: Hydrogen percolation in WO3

Ákos Vértes, Robert Schiller

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The diffusivity of H in a thin layer of WO3 was measured optically through the visible optical absorption of the H-containing substance. Microdensitometry and the photoresist technique made a 1-μm lateral resolution available. When the data were evaluated by Boltzmann's method, the diffusion coefficient, as low as about Dm ≈10- 11 cm2/sec at high H concentrations, was shown to increase sharply with decreasing H content. This behavior was quantitatively understood in terms of a percolation model modified by assuming H atoms to jam fast channels. The extreme low-concentration diffusion coefficient D0 was evaluated by virtue of this model and gave D0≊10 -9 cm2/sec.

Original languageEnglish
Pages (from-to)199-203
Number of pages5
JournalJournal of Applied Physics
Volume54
Issue number1
DOIs
Publication statusPublished - Dec 1 1983

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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