Abstract
In the last decade a number of ternary molybdenum chalcogenides named Chevrel phase compounds, MxMo6X8 (M=metal ion ; X=S, Se and Te), have been investigated. Many of these compounds show properties as superconductors with high upper critical fields. Further, in some cases of M=rare earth elements, the coexistences of magnetism and superconductivity are observed. For these substances, the growth of large single crystals with good quality and the knowledge of the exact chemical composition are essential to the understanding of physical properties. Recently a series of compounds with more complicated structures, i. e. MxMo15X19, MxMo9X11 and M2Mo6 X6 (X=S, Se and Te) have also been prepared. Then the problems of these compounds in chemical side became more important. The present article reviews these substances from the viewpoint of crystal structure, crystal growth, nonstoichiometry and bonding character.
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