Charge transfer and valence electron concentration in Chevrel phases |
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Authors: | K. Yvon A. Paoli |
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Affiliation: | Laboratoire de Cristallographie aux Rayons X et Départment de Physique de la Matière Condensée, Université de Genève, 24 quai Ernest Ansermet, CH 1211 Genève 4, Switzerland |
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Abstract: | Single crystal X-ray diffraction measurements on MxMo3S4 compounds (M = Cu, Ag, Sn, In) yield evidence for the existence of a charge transfer from the interstitial element M to the Mo6S8 building blocks. The importance of this transfer was estimated from the contraction of the Mo6 octahedron as a function of the valency and the concentration of the cations. It is suggested that this effect stabilises the structure and has a strong influence on the superconducting transition temperature. Bonding is discussed using a simple valence bond model which is based on the electron requirement of the Mo6 octahedron to form 12 covalent bonds. |
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