Internal Friction Peak Of The Mixed-Alkali Glass 0.96Li20.0.04Na20.3.0Si02

Internal friction, electrical conductivity and oxygen trace diffusivity were measured in this 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.