Dielectric properties of some berate glasses

The dielectric constant, epsilon', and the dielectric loss, epsilon ", for some selected lead berate glasses within the frequency band 10(5) to 10(7) Hz and the temperature range (20 similar to 50)degreesC were measured. The dielectric dispersion and the dielectric loss absorption bands were observed. the relaxation time, the activation enthalpy and entropy change of the dielectric relaxation were calculated. The results obtained were discussed and correlated to the internal network structure of the glasses studied.