Abstract
Single crystals of proustite Ag 3 AsS 3 have been characterised by impedance spectroscopy and single-crystal X-ray diffraction in the temperature ranges of 295–543 and 295–695 K, respectively. An analysis of the one-particle potential of silver atoms shows that in the whole measuring temperature range defects in the silver substructure play a major role in the conduction mechanism. Furthermore, the silver transfer is equally probable within silver chains and spirals, as well as between chains and spirals. The trigonal R 3 c room temperature phase does not change until the decomposition of the crystal. The electric anomaly of the first-order character which appears near 502 K is related to an increase in the electronic component of the total conductivity resulting from Ag 2 S deposition at the sample surface.
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