Dielectric Dispersion in CuO Doped ZnF2–PbO–TeO2 Glasses

Abstract

Dielectric constant e', loss tan δ and conductivity σ of 45ZnF 2 -9PbO-(46 - x) TeO 2 -xCuO glasses (with x values ranging from 0.2 to 0.6) are studied as a function of frequency in the range 10 2 to 10 7 Hz and in the temperature range 30 to 200 °C. All these glasses are found to exhibit dipolar relaxation effects. The variation in e' and tan δ with frequency and temperature are observed to be strongly dependent on the concentration of CuO. The observed relaxation effects are described by Classius-Mossotti Debye relation with a set of relaxation times. The possible nature of relaxing dipoles is discussed.