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      https://www.ias.ac.in/article/fulltext/boms/007/03-04/0215-0228

    • Keywords

       

      Metal excess systems; silicides; superconducting compounds; ternary systems

    • Abstract

       

      A series of ternary equiatiomic transition metal silicidesMM′Si (M=Zr, Nb, Ta;M′=Ru, Re) and Zr1/2M1/2 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 Zr1/2M1/2RuSi (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.

    • Author Affiliations

       

      G V Subba Rao1 K Wagner1 2 Geetha Balakrishnan1 J Janaki1 3 W Paulus1 3 R Schöllhorn1 3 V S Subramanian1 U Poppe4

      1. Materials Science Research Centre, Indian Institute of Technology, Madras - 600 036, India
      2. Anorganische Chemie Institut der Universität Münster, Münster - 4400, West Germany
      3. Institut für anorg. und analyt., Chemie der Technischen Universität Berlin, Berlin - 1000, West Germany
      4. Institut für Festkörperforschung, KFA, Jülich - 5170, West Germany
    • Dates

       
  • Bulletin of Materials Science | News

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