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The ternary phase diagram of the Au-Pb-Rh system has been studied from a viewpoint of the formation of intermetallic compounds. We indeed discovered two new compounds with nominal chemical formula of AuPb2Rh2 and AuPb4Rh5. They are revealed by XRD study to possess a similar crystal structure with each other having an orthorhombic crystal structure with Pmma symmetry. The resistivity measurements of AuPb2Rh2 show double superconducting transitions at 2.8 K and 1.7 K, while AuPb4Rh5 did not above 1.1 K. The significant shift of stoichiometric ratio of Au and Rh observed in both compounds suggests strongly that vacancy structures and site exchange, in particular, the AuPb4Rh5 compound, may play an important role in the physical properties of these compounds.

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  This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1557/s43580-022-00440-x

Keyword: AuPb2Rh2, ternary phase diagram, Au–Pb–Rh, AuPb4Rh5, superconductor

Date published: 2022-12-06

Publisher: Springer Science and Business Media LLC

Journal:

• MRS Advances (ISSN: 20598521) vol. 8 issue. 7 p. 404-408

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4825

First published URL: https://doi.org/10.1557/s43580-022-00440-x

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Updated at: 2024-10-10 16:30:18 +0900

Published on MDR: 2024-10-10 16:30:20 +0900