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

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

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
Pages (from-to)325-332
Number of pages8
JournalActa Materialia
Volume124
DOIs
Publication statusPublished - 2017

Keywords

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

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