Transport Properties of Ge-Se-Te Glasses

摘要

The temperature dependencies of direct electrical conductivity, temperature and frequency dependencies of complex permitivity and complex electrical modulus (M* = 1/ ε*), have been measured in Ge0.2-Se0.8-x-Texglasses pure and doped by Pr3+and Er 3+ (1 000 wt. ppm). On the basis of measured results it was found that these glasses exhibit only one mechanism of electrical conductivity with activation energy U = (0.95 ±0.10) eV. The results of complex electrical modulus showed, that the measured glasses are single-phase but not homogeneous, with high concentration of the point defects due to the presence of Te and they are stable up to the temperature of 180 °C. The influence of chemical composition, non-stoichiometry and admixtures is usually low, because the formed compounds are in-built to the glass skeleton as configurations with saturated bonds