Powder neutron diffraction studies for the L21 phase of Co2YGa (Y = Ti, V, Cr, Mn and Fe) Heusler alloys

R. Y. Umetsu, K. Kobayashi, R. Kainuma, Y. Yamaguchi, K. Ohoyama, A. Sakuma, K. Ishida

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37 Citations (Scopus)

Abstract

Site occupancies of Co, Y (Y = Ti, V, Cr, Mn and Fe) and Ga atoms for the L21 phase in Co2YGa alloys annealed at 773 K were precisely investigated by powder neutron diffraction measurement. While Co atoms in all the five alloys almost perfectly occupy the x (2a) site, the occupancy of the z (4b) site by Ga atoms depends on the kind of Y atom, and it decreases with increasing number of valence electrons except for Co2CrGa alloy. Degrees of long-range order on the z site occupancy of Ga atoms experimentally determined for all the alloys are in good agreement with those thermodynamically estimated from their order-disorder transition temperatures using the Bragg-Williams-Gorsky approximation.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalJournal of Alloys and Compounds
Volume499
Issue number1
DOIs
Publication statusPublished - 2010 Jun 4

Keywords

  • Co-based Heusler alloys
  • Degree of long range order
  • L2 phase
  • Magnetic moment
  • Neutron powder diffraction

ASJC Scopus subject areas

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

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