Laves phases in RE(Mg,Cd)2 (RE = rare earth) pseudo-binary alloys

Nobuhisa Fujita, Shin Ichi Kikuchi, Ampo Sai

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Trends in the stability of Laves phases in the pseudo-binary alloy systems RE(Mg,Cd)2 (RE: rare earth element) are studied experimentally. Alloys are synthesized with various compositional ratios between Mg and Cd and with different REs. For most REs except Yb, a Laves phase forms only in the Mg-rich part of the phase diagram including the binary limit REMg2, while for Yb a Laves phase is maintained throughout the whole compositional range between YbMg2 and YbCd2. A thorough analysis on the compositions of the Laves phases in the Mg-rich part is performed, which reveals a systematic tendency towards off-stoichiometry with Mg-enrichment of about 5-10 atomic %. The phenomenon can be understood as a consequence of an unbalanced mixing of atomic species between two kinds of atomic sites. Rietveld refinements of the crystal structures reveal that a better fit is achieved by allowing the RE-positions to be replaced partially by Mg, which provides a supporting evidence for the atomistic model of off-stoichiometry.

Original languageEnglish
Pages (from-to)698-705
Number of pages8
JournalSolid State Sciences
Volume13
Issue number4
DOIs
Publication statusPublished - 2011 Apr 1

Keywords

  • Laves phase
  • Magnesium alloys
  • Off-stoichiometry
  • Rare earth

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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