Conductors. -Polycrystalline Cu 6PS5I is obtained by solid state reaction of Cu, S, P, and CuI in stoichiometric quantities (evacuated quartz tubes, 1. 450-500 K, 24 h, 2. 1020-1070 K, 5-6 d). Single crystals are grown by vapor transport of the microcrystalline ball milled product powder. The influence of grain size on the phase transitions (PT) and heat capacity in Cu 6PS5I single crystals and micro-and nanocrystalline powders (24 nm) is studied at 70-300 K. A step-like anomaly is observed at the second--order PT at 272.6 K with a weak smeared anomaly at the superionic-and ferroelastic first-order PT at 147.5 K. A further anomaly is observed for the bulk material at higher temperatures which is attributed to a 'surface' PT. The compound crystallizes in the cubic space group F43m (Z = 4, powder XRD) and is described as a set of face-sharing Frank-Kasper polyhedra with a coordination number of 16 (Friauf polyhedra). Heat capacity measurements on single crystals reveal a shift to higher PT temperatures with average grain size reduction. -(STUDENYAK*, I. P.; DEMKO, P. Y.; STUDENYAK, V. I.; MAIOR, M. M.; IL'KOVIC, S.; REIFFERS, M.; TIMKO, M.; J. Alloys Compd. 656 (2016) 439-442, http://dx.
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