Revisiting the revised Ag-Pt phase diagram

Gus L.W. Hart*, Lance J. Nelson, Richard R. Vanfleet, Branton J. Campbell, Marcel H.F. Sluiter, Jan H. Neethling, Ezra J. Olivier, Soraya Allies, Candace I. Lang, Bryce Meredig, Christopher Wolverton

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Because of the important applications of platinum alloys and related platinum-group-metals phases, complete phase diagrams for these systems are important for materials engineering. The currently accepted phase diagram for the Ag-Pt system is questionable because of its disagreement with earlier experiments and because of its claim for a lone ordered structure at 53%-Pt which was not characterized and which contradicts both computational predictions and analogy to the isoelectronic system Cu-Pt. A complete re-examination of the Ag-Pt system by computational and experimental means suggests a phase diagram similar to the isoelectronic system Cu-Pt. The unknown compound, claimed to be 53%-Pt, is found to be the L11 structure at 50%-Pt.

Original languageEnglish (US)
Pages (from-to)325-332
Number of pages8
JournalActa Materialia
Volume124
DOIs
StatePublished - Feb 1 2017

Keywords

  • Ag-Pt
  • Cluster expansion
  • Phase diagrams
  • Platinum alloys

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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    Hart, G. L. W., Nelson, L. J., Vanfleet, R. R., Campbell, B. J., Sluiter, M. H. F., Neethling, J. H., Olivier, E. J., Allies, S., Lang, C. I., Meredig, B., & Wolverton, C. (2017). Revisiting the revised Ag-Pt phase diagram. Acta Materialia, 124, 325-332. https://doi.org/10.1016/j.actamat.2016.10.053