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

Subba Rao, G. V. ; Wagner, K. ; Balakrishnan, Geetha ; Janaki, J. ; Paulus, W. ; Schöllhorn, R. ; Subramanian, V. S. ; Poppe, U. (1985) Structure and superconductivity studies on ternary equiatomic silicides, MM'Si Bulletin of Materials Science, 7 (3-4). pp. 215-228. ISSN 0250-4707

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A series of ternary equiatiomic transition metal silicides MM'Si (M=Zr, Nb, Ta;M'=Ru, Re) and Zr½M½RuSi (M=Nb, Ta) have been synthesized and characterized. Guinier X-ray data clearly indicate that the compounds MM'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 to MReSi, M=Nb, Ta. ZrRuSi and Zr½M½RuSi (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 in MM'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. Zr½Nb½RuSi 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.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Metal Excess Systems; Silicides; Superconducting Compounds; Ternary Systems
ID Code:52512
Deposited On:04 Aug 2011 08:25
Last Modified:18 May 2016 06:01

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