Internal friction peak of the mixed-alkali glass 0.96Li_2O centre dot 0.04Na_2O centre dot 3.0SiO_2

摘要

Internal friction, electrical conductivity and oxygen tracer diffusivity were measured of 0.96Li_2O centre dot 0.04Na_2O centre dot 3.0SiO_2 glass.The internal friction curve exhibited a compound peak, which was resolved into its two components: a low-temperature peak and a mixed-alkali 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.