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 journalArticlepeer-review

31 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

Funding

G. L. W. H. and L. J. N. are grateful for financial support from the NSF , DMR-0908753 . J. H. N. and E. J. O. acknowledge the financial support from the NRF and DST. We appreciate helpful discussions about microprobe analysis with John Fournelle and Mike Dorais. B. M. (FPASS calculations) acknowledges support by the U.S. Department of Energy , Office of Science, Basic Energy Sciences, under Grant No. DEFG02-07ER46433 . C. W. acknowledges financial assistance award 70NANB14H012 from U.S. Department of Commerce , National Institute of Standards and Technology as part of the Center for Hierarchical Materials Design (CHiMaD).

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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