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Geetha Balakrishnan
Articles written in Bulletin of Materials Science
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Volume 6 Issue 2 May 1984 pp 283-316 Superconductivity
Structure and superconductivity in ternary systems of compounds
G V Subba Rao Geetha Balakrishnan
A survey of the known high
T c ternary systems of compounds is presented. Special emphasis has been placed on the part played by the crystal structure and bonding in the exhibition of highT c superconductivity. The superconducting and other physical properties of the ternary borides have been discussed in relatively more detail. Finally, the available guidelines from crystal and solid state chemistry points of view, have been reiterated for a search for new highT c materials. -
Volume 7 Issue 3-4 October 1985 pp 215-228
Structure and superconductivity studies on ternary equiatomic silicides,
MM ′SiG V Subba Rao K Wagner Geetha Balakrishnan J Janaki W Paulus R Schöllhorn V S Subramanian U Poppe
A series of ternary equiatiomic transition metal silicides
MM ′Si (M =Zr, Nb, Ta;M ′=Ru, Re) and Zr1/2M 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 toM ReSi,M =Nb, Ta. ZrRuSi and Zr1/2M 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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Bulletin of Materials Science
Volume 44, 2021
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Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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