Dielectric properties and phase transitions in crystals of TlIn[S.sub.x][Se.sub.2-x] solid solutions

This paper reports on a study of the dielectric permittivity and electrical conductivity of single-crystal TlIn[S.sub.x][Se.sub.2-x] solid solutions as functions of temperature and composition. It has been found that the dielectric permittivity s and electrical conductivity a decrease with increasing x and increase with growing temperature. The temperature dependences ζ = f(T) and a = f(T) for TlIn[S.sub.x][Se.sub.2-x] crystals have been demonstrated to reveal anomalies in the form of maxima, which suggests that these crystals undergo phase transitions. The temperatures of the phase transitions increase with increasing x.