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Structure and superconductivity studies on ternary equiatomic silicides,MM′Si

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Abstract

A series of ternary equiatiomic transition metal silicidesMM′Si (M=Zr, Nb, Ta;M′=Ru, Re) and Zr1/2 M 1/2 RuSi (M=Nb, Ta) have been synthesized and characterized. Guinier x-ray data clearly indicate that the compoundsMM′Si (M=Nb, Ta;M′=Ru, Re) crystallize with the orthorhombic TiFeSi-structure. This is contrary to one of the literature reports ascribing the hexagonal ZrRuSi structure toMReSi,M=Nb, Ta. ZrRuSi and Zr1/2 M 1/2RuSi (M=Nb, Ta), however, crystallize with the ZrRuSi structure. All the compounds are metallic and exhibit small and negative Seebeck coefficients. Superconductivity has been discovered inMM′Si,M=Nb, Ta;M′=Ru, Re and the transition temperatures, as measured by the low frequency a.c. susceptibility technique, range from 2·7 to 5·1 K. Zr1/2Nb1/2RuSi is not superconducting above 2·2 K. The observed properties are explained in terms of the electronic charge transfer effects and crystal structures adopted by these metal excess ternary silicides.

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Authors and Affiliations

  1. Materials Science Research Centre, Indian Institute of Technology, 600 036, Madras, India

    G V Subba Rao, K Wagner, Geetha Balakrishnan, J Janaki, W Paulus, R Schöllhorn & V S Subramanian

  2. Anorganische Chemie Institut der Universität Münster, 4400, Münster, West Germany

    K Wagner

  3. Institut für anorg. und analyt., Chemie der Technischen Universität Berlin, 1000, Berlin, West Germany

    J Janaki, W Paulus & R Schöllhorn

  4. Institut für Festkörperforschung, KFA, 5170, Jülich, West Germany

    U Poppe

Authors
  1. G V Subba Rao
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  2. K Wagner
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  3. Geetha Balakrishnan
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  4. J Janaki
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  5. W Paulus
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  6. R Schöllhorn
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  7. V S Subramanian
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  8. U Poppe
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Dedicated to the memory of Prof. N S Satya Murthy.

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Subba Rao, G.V., Wagner, K., Balakrishnan, G. et al. Structure and superconductivity studies on ternary equiatomic silicides,MM′Si. Bull. Mater. Sci. 7, 215–228 (1985). https://doi.org/10.1007/BF02747575

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