A study on electric properties of heterogeneous copper-containing photochromic glasses

This study is concerned with the electric resistivity, loss tangent, and dielectric constant of copper-halide photochromic glasses (Cu-PCGs), both before and after heat treatment at 500-650{degree}C for 3 to 12 h. Measurements were made in the temperature range 20-450{degree}C at frequencies of 10{sup 3}, 10{sup 5}, and 10{sup 6} Hz. Transport numbers were also determined in order to identify the type of conduction. It is shown that the matrix phase of the glasses in question possesses electrolytic conduction. The dielectric properties of the glasses are independent of chemical conversions in the photosensitive phase and are determined by the properties of the matrix phase of Cu-PCGs.