Ion beam analysis of dependence of the D-H replacement speed on trivalent impurity concentration in D-implanted oxide ceramics exposed to H2O vapor at room temperature

Kenji Morita, Bun Tsuchiya, Shinji Nagata, Koji Katahira

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2 Citations (Scopus)

Abstract

The speed of D-H replacement in D-implanted BaCe1-XY XO3-δ and SrCe1-XYbXO 3-δ, exposed to H2O vapor at room temperature has been studied as a function of X by use of the ERD technique with 1.7 MeV He + ion beam. The decay curve of D and growth curve of H in the specimens have been measured as a function of exposure time, and the decay constants of D, namely the D-H replacement speeds, have been obtained by fitting the experimental curves to the theoretical curves of D decay and H growth, which are derived from the mass balance equations described on the one-way diffusion model for the D-H replacement: absorption of H+ due to splitting of H2O physisorbed at the surface, diffusion of H + and emission of D implanted in the traps as HD molecule due to bulk recombination of H+ and subsequent trapping of H+ in the vacant trap. It is found for both specimens that the decay constants of D, proportional to the absorption coefficient and the molecular formation coefficient of HD, increase, and after a maximum at X = 0.05-0.1 decrease as X increases, and the absolute experimental values for BaCe1-XY XO3-δ are larger almost by an order of magnitude than those of SrCe1-XYbXO3-δ. These experimental results are discussed in terms of the one-way diffusion model on D-H replacement and water splitting model at the surface.

Original languageEnglish
Pages (from-to)1573-1577
Number of pages5
JournalSurface and Interface Analysis
Volume38
Issue number12-13
DOIs
Publication statusPublished - 2006 Dec 1

Keywords

  • Hydrogen gas emission
  • Hydrogen isotopes replacement
  • Ion beam analysis
  • Oxide ceramics
  • Water splitting

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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