Metal atom incorporation studies on AxMo6S8 Chevrel phases

Umarji, A. M. ; Subba Rao, G. V. ; Janawadkar, M. P. ; Radhakrishnan, T. S. (1980) Metal atom incorporation studies on AxMo6S8 Chevrel phases Journal of Physics and Chemistry of Solids, 41 (5). pp. 421-429. ISSN 0022-3697

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Group IIIa metals and Nb, Hg and Pb containing AxMo6S8 Chevrel phases have been synthesized by low temperature reaction (420-430°C) frorn A metal and Mo6S8. Some of these phases are hitherto unknown. Electrolysis method of preparation of AxMo6S8 reported by Schöllhorn does not yield the desired phases when A = Pb or Ag. Stoichiometry, thermal stability, electrical and superconducting properties of the compounds have been examined. In the PbxMo6S8 system, a series of phases with varying x have been prepared and studied. Group IIIa metal and Nb-compounds are found to be semiconductors with low energies of activation exhibiting p-type behavior in the range 77-300 K. Hg-phase behaves as a metal or a degenerate semiconductor and does not become superconducting above 4.2 K. X-Ray, resistivity and Tc studies show that for x ≤ 0.8 in PbxMo6S8, the compounds behave more like Mo6S8 and only for x ≅ 1.0 or (Pb---Bi)1.0, the inherent behavior of the ternary Chevrel phase is exhibited. Seebeck coefficients are small and positive for Mo6S8, Cu and Pb-containing phases in the range 77-300 K. The results are discussed in the light of available band structure of these materials.

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