Cation-Network Interactions in Binary Alkali Metal Borate Glasses. A Far-Infrared Study

Article abstract of DOI:10.1021/j100306a058

The far-infrared spectra of compositions probing the glass-forming regions of all five binary alkali metal borate systems χM2O.(1-χ)B2O3 (0<χ0.25.One distribution of cation sites has been observed for the lower alkali metal content Rb and Cs glasses.The fractions of cations in the two different network sites have also been evaluated.The squares of the frequencies of the cation-motion bands were found to vary linearly with composition, and exhibit kinks at χ ca. 0.20, for all but the Cs glasses.This behavior was explained on the basis of the network structural changes known to occur at this composition.