Ag 10 Te 4 Br 3 is the first representative of an M(group 11) (poly)chalcogenide halide with covalently bonded [Te 2 ] 2 - units and isolated Te 2 - ions. It represents a new class of materials located between M(group 11) chalcogen halides, characterized by covalently bonded chalcogen structure motives, on the one hand and chalcogenide halides, consisting of isolated chalcogenide ions, on the other. A high silver mobility on distinct silver layers was observed for orthorhombic Ag 10 Te 4 Br 3, resulting in a pronounced 1D silver mobility at room temperature. The covalent regions of the chalcogen substructure account for the lowest activation energies, determined after a detailed analysis of the silver joint probability density functions (jpdf). Impedance spectroscopic measurements were performed in order to substantiate the results from jpdf analyses. Ag 10 Te 4 Br 3 is an excellent conductor, with conductivities on the same order of magnitude as β-Ag 3 SX (X = I, Br) or glassy silver chalcogenide halides. The occurrence of the [Te 2 ] 2 - dumbbell was substantiated by Raman spectroscopy.
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Lange et al. (2006) studied this question.
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