Borophosphate glasses with dopants SrO and Li2O in the composition of 20(B2O3) + 30(P2O5) + (50-x) (SrO) + x (Li2O) where x = 10, 20, 30, 40 and 50 were synthesized by standard melt quenching technique. All the glass samples were annealed to extract the thermal strains presence in it if any, its amorphous nature was evidenced by XRD characterization, density of the as synthesized glass series has been calculated at the ambient temperature using Archimedes’ principle and also its molar volume was estimated. With increase in mole fraction of Li2O, density of the glass samples found deceasing and the molar volume observed to be increasing as per the trends. Using Nernst-Einstein equation, high temperature dc activation energy has been calculated.
One o K107 the basic tasks of solid state theory has been to account for the e -x t r i c a l resistivity of metals. Bardeen /1/ starting from first principles gave a quantitative description of the resistivity of monovalent metals in the high temperature region. Since then many calculations on simple metals have been carried out using the variational approach, notably the work of Ziman /2/, Bailyn /3/, and Hasegawa /4/. In another approach, Greene and Kohn /5/ used a phase shift analysis with the Friedel sum rule to obtain the electron-ion scattering cross-section for calculating the electrical resistivity .of sodium. Here we consider the temperature dependence of the phonon limited electrical resistivity in noble metals caused by scattering of electrons by 1attice.vibrations using the pseudopotential approach /6/. The advantage with this method is that it allows us to take into account the Umklapp processes and coupling to transverse n z e where m is the electronic mass, e tine electronic charge, n the number of electrons per unit volume, and z the valence of the metal.In the weak scattering approximation, using the pseudopotential and simplest trial function, for lattices with cubic symmetry, the relaxation time z for electron scattering by lattice oscillations is given by /8/, e 1) Allahabad-2 11 002. India.
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