Measurement of diffusion process of iron atoms under high pressure of hydrogen by time-domain analysis of nuclear resonant scattering of X-rays

Hidetaka Kasai, Taizo Kawauchi, Yuh Fukai, Xiao Wei Zhang, Shunji Kishimoto, Takumi Kikegawa, Eiji Ohtani, Tatsuo Okano

Research output: Contribution to journalArticlepeer-review

Abstract

We applied the time-domain analysis of nuclear resonant scattering (NRS) of X-rays for the study of the hydrogen-induced enhancement of atomic diffusion. The time-domain analysis of NRS is a powerful technique for studying diffusion processes on an atomic scale. The NRS measurement combined with high-pressure technique enables the direct measurement of self-diffusion processes under high hydrogen pressures. In this preliminary experiment, self-diffusion in 4 μm thick 57 Fe foils at 0.8 GPa was investigated. The samples of the 57 Fe were encapsulated with MgO or NaCl. Faster decays caused by diffusion of Fe atoms were observed in the time spectra of NRS at high temperatures. This enhancement of diffusion is believed to be the hydrogen-induced effect. In the present experiment, hydrogen should have been supplied to the samples by reaction with water originally adsorbed on NaCl/MgO powder particles. It was concluded that the diffusion of 57 Fe atoms under high pressure can be studied by nuclear resonant scattering of X-rays using a compact cubic-anvil press. The NRS method can also be extended to the study of atomic diffusion in the subsurface region by doping 57 Fe layer(s) at known depths.

Original languageEnglish
Pages (from-to)984-986
Number of pages3
JournalApplied Surface Science
Volume256
Issue number4
DOIs
Publication statusPublished - 2009 Nov 30

Keywords

  • Diffusion
  • High pressure
  • Hydrogen
  • Iron
  • Nuclear resonant scattering

ASJC Scopus subject areas

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

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