Neutron diffraction study of deuterium ordering in C15 type TaV2Dx (x>1) in the temperature range of 1.5-295 K

P. Fischer, F. Fauth, A. V. Skripov, A. A. Podlesnyak, L. N. Padurets, A. L. Shilov, B. Ouladdiaf

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Abstract

Neutron diffraction investigations on the C15-type Laves phase deutendes TaV2Dx with nominal compositions 1.3≤x≤1.65 have shown that at T>150 K deuterium atoms (D) occupy 96g sites of space group Fd3̄m, i.e. tetrahedral interstices with [Ta2V2] coordination. However, the D positions are found to be considerably displaced from the geometrical centres of these sites. Below 150 K deuterium ordering is revealed by the appearance of superlattice peaks. Their intensities are found to increase substantially with increasing D content.

Original languageEnglish
Pages (from-to)282-285
Number of pages4
JournalJournal of Alloys and Compounds
Volume253-254
DOIs
StatePublished - May 20 1997
Externally publishedYes

Funding

We are grateful to A.V. Irodova and V.A. Somenkov for helpful discussions. This work was partially supported by the Russian Foundation for Fundamental Research (grants 95-03-09743 and 96-02-16517). AVS acknowledges financial support from the Alexander von Humboldt Foundation and by Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute. AAP is grateful to the Swiss National Science Foundation for financial support.

Keywords

  • Laves phases
  • Neutron powder diffraction
  • Order-disorder transitions
  • Transition metal deutendes

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