Abstract
Brillouin spectra of lithium silicate glasses with various lithium oxide concentrations have been investigated over a wide temperature range. The room-temperature elastic constants increase significantly with increasing lithium oxide concentration. This indicates that rigidity increases with lithium oxide concentration. From the temperature dependence of the longitudinal elastic modulus, it was found that the rigidity decreases on heating, faster with a high lithium content. The rate of decrease becomes significantly larger above the glass transition temperature Tg. This is related to the disruption of network bonds, suppressing the rigidity of the melt structures on heating. The increased lithium oxide concentration leads to a faster degradation in the network structure. The Tg of lithium silicate glasses was determined. The increased fragility with increased lithium oxide concentration reflects the significant decrease in longitudinal elastic modulus with temperatures above Tg. Crystallization temperature decreases with increasing lithium oxide concentration.
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