Dielectric investigations of superionic Cu6PS5Br single crystal

The dielectric investigations of Cu6PS5Br crystals in broad (25–420 K) temperature range show various phase transitions: the ferroelastic phase transition at 266 K, the superionic phase transition at 170 K and the possible structural phase transition at 40 K. Above the superionic phase transition temperature at low frequencies dielectric spectra are highly influenced by very high ionic conductivity. At lower temperatures the dielectric properties are mainly determined by ferroelastic domain dynamics.