Abstract
Cu 7PSe 6 is a mixed conductor exhibiting structural phase transitions above and below room temperature that are accompanied by step-like changes in electrical conductivity. The substitution of S 2− for Se 2− in Cu 7PSe 6 significantly enhances electrical conductivity at room temperature compared to that observed for the pure compound. In the case of Cu 7P(Se 0.80S 0.20) 6, a nearly temperature-independent electrical conductivity exceeds 1 S/cm with no evidence of any phase transitions throughout the temperature interval 200–400 K. However, the ionic contribution accounts for just 2% of the total electrical conductivity in this solid solution at room temperature.
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