lonic conductivity of Li2O-B2O3-Li2SO4 glasses

Abstract

Electrical conductivity and Raman spectra were measured and glass-forming region was determined in the Li2O-B2O3-Li2SO4 glass system. The relation between conductivity and composition was discussed on the basis of the glass structure. Conductivity rapidly increased with addition of Li2SO4 up to 20 mol%. Maximum conductivity was obtained in the metaborate compositions containing a larger amount of Li2SO4, and minimum activation energy at the composition of metaborate with a modest amount of Li2SO4. The glasses containing a large amount of Li2O or Li2SO4 had higher activation energies. The activation energy change with Li2O/B2O3 ratio may be explained from the viewpoint of borate structure. But the reason for the activation energy change with Li2SO4 addition in a metaborate composition has not yet been clarified.