Chemical and Intrinsic Hydrogen Diffusion in Pd0.75Ag 0.25-H Alloys: NMR Aspects

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Abstract

In-situ hydrogen charging (discharging) process was realized in Pd 0.75Ag0.25-H alloys and simultaneous hydrogen concentration and nuclear spin-spin relaxation time measurements were done. Concentration-gradient driven diffusion coefficient was estimated from the hydrogen concentration-charging (discharging) time curve and data for the intrinsic diffusivity were deduced from the spin-spin relaxation time. Two-component spin-spin relaxation was found in the whole hydrogen concentration range, and at high H concentration, one of those is attributed to the hydrogen atoms embedded in the α the other one in the β phase. The diffusional motion is localized up to 105 - 106 intrinsic steps and there is no hydrogen atom exchange between the α and β phases on the time scale of spin-spin relaxation.

Original languageEnglish
Pages (from-to)93-106
Number of pages14
JournalDefect and Diffusion Forum
Volume224-225
Publication statusPublished - Jan 1 2004

Keywords

  • Chemical Diffusion
  • Hydrogen Diffusion
  • Hydrogenated Alloys
  • Intrinsic Diffusion
  • Nuclear Magnetic Resonance
  • PdAg

ASJC Scopus subject areas

  • Radiation
  • Materials Science(all)
  • Condensed Matter Physics

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