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Abstract
Previously unreported σ-phases in the ternary niobium-based systems Nb–X–Ga for X = Ru, Rh, Pd, Ir, Pt, Au, and Nb–X–Al for X = Ir, and Pt are presented, prepared by arc-melting followed by annealing at 1000 °C for 1 week. The phases are primitive tetragonal (P42/mnm, no. 136) with lattice parameters of a = 9.8336(2)–9.9432(1) Å and c = 5.1098(1)–5.1718(1) Å. Refinements of the single crystal X-ray diffraction data for the Ru and Ir containing materials gave the formulas Nb20Ru5Ga5 and Nb20Ir4Ga6, showing mixing of X/Ga on the crystallographic 8i2 and 2a sites of the structure, a type of disorder frequently found in σ-phases. We present a graphical classification for ternary σ-phases that places our materials in context with previous materials. The materials do not show evidence of bulk superconductivity above 2 K. Synthesis of equivalent Ta-based σ-phases was attempted but they were not found.
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Authors (4)
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Elizabeth M. Carnicom
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Weiwei Xie
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Robert J. Cava
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Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
DALTON TRANSACTIONS
no. 46,
edition 41,
pages 14158 - 14163,
ISSN: 1477-9226 - Language:
- English
- Publication year:
- 2017
- Bibliographic description:
- Carnicom E., Xie W., Klimczuk T., Cava R.: New σ-phases in the Nb–X–Ga and Nb–X–Al systems (X = Ru, Rh, Pd, Ir, Pt, and Au)// DALTON TRANSACTIONS. -Vol. 46, iss. 41 (2017), s.14158-14163
- DOI:
- Digital Object Identifier (open in new tab) 10.1039/c7dt02955a
- Verified by:
- Gdańsk University of Technology
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