Abstract
A Na2B4O7 glass sample was prepared by melt quenching technique. The complex dielectric permittivity epsilon*(f, T) has been measured in the frequency range from 10 mHz to1 MHz in the temperature range from room temperature to 300 degrees C. From the dielectric spectra, it is evident that there are at least one dipolar relaxation process occurring between 10(3) Hz - 10(6) Hz. The low frequency realm of the spectrum is dominated by dc conductivity which could be successfully modeled by the 1/omega law. The temperature dependence of the dc conductivity sigma(dc)(T) = sigma(0)e-(EA/kT) is Arrhenius-like with activation energy equals to 0.64 eV. The ac conductivity has been calculated and found to vary with frequency as f(Sac), the exponent S-ac decreases slightly with increasing temperature.