Electrical properties of ceramics based on Ag7TS5I (T = Si, Ge) solid electrolytes

Abstract

Abstract. The ceramic samples based on the synthesized compounds of Ag7TS5I (T =Si, Ge) solid electrolytes were prepared with using of micro- and nanocrystalline powders. Structural studies of powders obtained by grinding in an agate mortar as well as in a planetary ball mill were carried out by XRD and SEM techniques. Optical microscopy was used to estimate the size of crystallites after annealing of prepared ceramics. Temperature (292–383 K) and frequency (10 Hz–2 106 Hz) dependences of total electrical conductivity of ceramic samples were investigated by impedance spectroscopy technique. Separation of electronic and ionic parts of electrical conductivity were carried out by the analysis of Nyquist plots using electrode equivalent circuits. The dependences of ionic and electronic components of the electrical conductivity on temperature and on average size of the crystallites were investigated for Ag7TS5I-based ceramics. The comparison of electrical parameters for Ag7TS5I (T ¼ Si, Ge) crystals, composites and ceramics was performed.