Revisiting the revised Ag-Pt phase diagram

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• 作者：Gus L.W. Hart^a ; ^{gus.hart@gmail.com} ; Lance J. Nelson^a ; Richard R. Vanfleet^a ; Branton J. Campbell^a ; Marcel H.F. Sluiter^b ; Jan H. Neethling^c ; Ezra J. Olivier^c ; Soraya Allies^d ; Candace I. Lang^e ; Bryce Meredig^f ; ^g ; Christopher Wolverton^f
• 关键词：Platinum alloys ; Cluster expansion ; Phase diagrams ; Ag-Pt
• 刊名：Acta Materialia
• 出版年：2017
• 出版时间：1 February 2017
• 年：2017
• 卷：124
• 期：Complete
• 页码：325-332
• 全文大小：1721 K
• 卷排序：124

文摘

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.