Abstract
The ternary phase diagram of the Pb-rich Au–Pb–Rh system has been studied from a viewpoint of the formation of intermetallic compounds. We indeed discovered two new compounds with the 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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The data that support the above-presented results are available from the corresponding author upon reasonable request.
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The author would like to thank Takanari Kashiwagi for the valuable discussion and support.
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Subotić, N., Mochiku, T., Matsushita, Y. et al. Investigation of the ternary phase diagram of Au–Pb–Rh compounds. MRS Advances 8, 404–408 (2023). https://doi.org/10.1557/s43580-022-00440-x
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DOI: https://doi.org/10.1557/s43580-022-00440-x