Hydrogen-induced superabundant vacancies and diffusion enhancement in some FCC metals

Y. Fukai, T. Haraguchi, E. Hayashi, Y. Ishii, Y. Kurokawa, J. Yanagawa

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)


Lattice contractions caused by the formation of extremely high concentrations of vacancies (superabundant vacancies of ∼10 at.%) were observed in the fcc phases of Mn-H, Fe-H, Co-H, Ni-H and Pd-H samples at high temperatures ( ≦900°C ) and high H2 pressures ( ≦ 5 GPa). Comprehensive measurements in the Pd-H system, analyzed in terms of our theory of vacancy- hydrogen ( Vac-H ) cluster formation, have allowed to determine the formation and migration properties of the Vac-H clusters. From the observed lattice contraction process and concomitant diffusion enhancement, it is concluded that most Vac-H clusters are introduced by diffusion from the surface over a long time but some of them are created instantly at internal sources.

Original languageEnglish
Pages (from-to)1063-1068
Number of pages6
JournalDefect and Diffusion Forum
Issue number194-199 PART 2
Publication statusPublished - 2001
Externally publishedYes


  • Diffusion Enhancement
  • FCC Metals
  • Superabundant Vacancies
  • Vacancy-Hydrogen Cluster

ASJC Scopus subject areas

  • Radiation
  • General Materials Science
  • Condensed Matter Physics


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