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Preparation of M x Ta 6−x S (M = V, Cr; x ≃ 1) A new columnar structure with interpenetrating metal icosahedra
Author(s) -
Harbrecht Bernd B.,
Franzen Hugo F.
Publication year - 1987
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19875510808
Subject(s) - monoclinic crystal system , crystallography , metal , crystal structure , materials science , x ray crystallography , space group , diffraction , phase (matter) , chemistry , metallurgy , physics , organic chemistry , optics
The products of the high temperature reaction of Ta 2 S with equimolar amounts of V and Cr, respectively, have been characterized by X‐ray spectrometry and diffraction. The structures of the metal‐rich compounds M x Ta 6−x S (M = V, Cr; x ≃ 1) have been determined from with single crystal X‐ray intensities. The isotypic phases crystallize in the monoclinic space group C2/c four formula units per unit cell. The structure is interpreted as consisting of interpenetrating distorted metal icosahedra arranged to columns which in turn are connected to form layers via additional TaTa interactions. Metal‐sulphur and weaker metal–metal Bonds provide the linkage of the layers. The coordination about S is square antiprismatic. The structural relationship and fundamental distinctions between M x Ta 6−x S and Ta 6 S are pointed out. Thermodynamic quantities are used to elucidate the various reaction products and differences between Ta 6−x V x S and Cr x Ta 6−x S with respect to the phase widths.