X-Ray and neutron diffraction studies of atomic scale structures of crystalline and amorphous TbFe2Dx

Keiji Itoh, Kazuyuki Kanda, Kiyoshi Aoki, Toshiharu Fukunaga

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Both X-ray and neutron diffraction techniques were employed in order to elucidate short-range structures of crystalline (c-)TbFe2D3.8 and amorphous (a-)TbFe2Dx (x = 3.0, 2.0) prepared by deuterium absorption of the C15 Laves phase compound TbFe2. Interatomic distances and coordination numbers were derived from the radial distribution functions, RDF(r)s. The RDF(r)s observed by X-ray diffraction indicated that c-TbFe2D3.8 adopts a rhombohedral structure, but there is a little difference in the arrangement of metal atoms between the original C15 Laves phase c-TbFe2 and the rhombohedral c-TbFe2D3.8. In contrast, our results indicated that there is a large difference in the arrangement of metal atoms between c-TbFe2 and a-TbFe2Dx (x = 3.0, 2.0) and there are clusters of Fe and Tb atoms in a-TbFe2Dx (x = 3.0, 2.0). RDF(r)s observed by the neutron diffraction indicated that the D atoms occupy tetrahedral sites consisting of 2Tb + 2Fe in c-TbFe2D3.8, while they occupy sites consisting of 4Tb, 3Tb + 1Fe and 2Tb + 2Fe in a-TbFe2Dx (x = 3.0, 2.0).

Original languageEnglish
Pages (from-to)167-172
Number of pages6
JournalJournal of Alloys and Compounds
Volume348
Issue number1-2
DOIs
Publication statusPublished - Jan 13 2003

Keywords

  • Crystal structure
  • Metal hydrides
  • Neutron diffraction
  • Rare earth compounds
  • X-Ray diffraction

ASJC Scopus subject areas

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

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