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Laves phases in RE(Mg,Cd)2 (RE = rare earth) pseudo-binary alloys
- Source :
- Solid State Sciences. 13:698-705
- Publication Year :
- 2011
- Publisher :
- Elsevier BV, 2011.
-
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 REMg 2 , while for Yb a Laves phase is maintained throughout the whole compositional range between YbMg 2 and YbCd 2 . 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.
Details
- ISSN :
- 12932558
- Volume :
- 13
- Database :
- OpenAIRE
- Journal :
- Solid State Sciences
- Accession number :
- edsair.doi...........088c2f3fcc45c79c01d1b42c7c834797