Location of deuterium atoms absorbed in nanocrystalline graphite prepared by mechanical alloying

Toshiharu Fukunaga, Keiji Itoh, Shinichi Orimo, Masakazu Aoki, Hironobu Fujii

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

Neutron diffraction is an important technique for studying the structure of hydride materials. H/D isotopic substitution was employed to observe the location of deuterium atoms in deuterated nano-graphite because the coherent scattering length of deuterium is large enough to be observed in comparison with that of the metal atoms forming hydrogen absorbing materials. The preparation of the nano-crystalline graphite and the absorption of deuterium atoms in the graphite were carried out simultaneously by mechanical alloying under D2 gas atmosphere. The transformation from the hexagonal graphite as a starting material into amorphous-like carbon was observed by neutron diffraction. The conformation in the graphite was changed by the creation of dangling bonds and deuterium was absorbed by the solid-gas reaction when the milling proceeded. Two types of the deuterium coordinations were found in radial distribution function, RDF(r). One is the C-D covalent bond and the other is deuterium located betwe en layers of the graphite.

Original languageEnglish
Pages (from-to)224-229
Number of pages6
JournalJournal of Alloys and Compounds
Volume327
Issue number1-2
DOIs
Publication statusPublished - Aug 30 2001
Externally publishedYes

Keywords

  • Gas-solid reactions
  • Hydrogen absorbing materials
  • Mechanical alloying
  • Nanostructured materials
  • Neutron diffraction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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