Internal friction peak of the mixed-alkali glass 0.96Li2O∙0.04Na2O∙3.0SiO2

Abstract

Internal friction, electrical conductivity and oxygen tracer diffusivity were measured of 0.96Li2O∙0.04Na2O∙3.0SiO2 glass. The internal friction curve exhibited a compound peak, which was resolved into its two components: a low-temperature peak and a mixedalkali peak, whose activation energies were determined. These values were then compared with the activation energies of electrical conductivity and oxygen tracer diffusivity. Results show that, in agreement with earlier findings, the low-temperature peak is due to the movement of alkali ions. Results also suggest that the mixed-alkali peak is due to the movement of nonbridging oxygen ions.