Abstract
Different glass samples prepared from Egyptian basalt with different Na2O content according to the composition [(100-x) basalt + x Na2O], where x = 10, 15, up to 35 mol%. The samples mixtures were melted at 1300 degrees C for 2 h. Each sample will be recognized from its sodium to basalt (S/B) ratio. The sample of 0.54 ratio exhibits a slight crystalline phase. As S/B ratio was increased, the density decreased gradually while the molar volume increased, and the pure amorphous nature was confirmed by comparing the experimental and the empirical density and molar volume values. The electrical conductivities, DC and AC, were found to increase as the (S/B) ratio was gradually increase up to 0.33, then the samples showed approximate stable value up to the sample of 0.54 ratio. While the activation energy showed gradual decrease up to 0.33 ratio, then it exhibits nearly a stable value. The activation energy values indicated that all the studied samples behave like semiconductors. It appeared also from the AC conductivity results that the relation of the s-factor with the sample temperature showed that the conduction mechanism of these samples obeys the correlated barrier hopping (CBH) model. The structure of the same samples was studied in our previous work by XRD, FTIR and Mossbauer spectrometer.