Structural and electrical properties of argyrodite-type Cu7PS6 crystals

Anotacija

Cu₇PS₆ crystals were grown using direct crystallisation from the melt (Bridgman–Stockbarger technique). The crystal structure of Cu₇PS₆ was determined by X-ray powder diffraction. Cu₇PS₆ crystallise in the cubic structure, space group P2₁3 (No. 198), the lattice parameter a = 9.6706(1) Å, formula units per cell Z = 4. Electrical properties of Cu₇PS₆ crystals were studied in the frequency range 10–10¹⁰ Hz and in the temperature interval 296–351 K. The performed analysis shows that the Cu₇PS₆ crystals are mixed electron-ionic conductors with some growth defects.