Tetrahedral bonding in the glassy semiconductor Cu 15As 34Se 51

Abstract

An X-ray diffraction radial-distribution study of the Cu 15As 34Se 51, alloy obtained by the melt-quench method, has been performed. We reject a model with As three-fold and Se two-fold coordinated. The short-range order may be a tetrahedral framework centered on Cu and some on As atoms. The Cu-Se bond may be responsible for its electrical resistivity.