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 journalArticleScientificpeer-review

    17 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
    JournalActa Materialia
    Volume124
    DOIs
    Publication statusPublished - 2017

    Keywords

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

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