Semiconductor–Superionic Phase Transition in Silver Sulfide Films

The frequency dependences of the dielectric loss tangent tan δ( f ) and the Cole–Cole diagrams of silver sulfide thin films are studied at various temperatures in the range 0–200°C. The experimental data are compared to the calculation of the complex impedance of the electric circuit proposed for Ag2S-containing samples before and after the temperature semiconductor–superionic phase transition. A microscopic model of the phase transition in Ag2S is proposed on the base of the analysis of obtained results and literature data.