Elastic Anomaly of Glass Transitions in Lithium Silicate

概要

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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 $T_{\text{g}}$. 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 $T_{\text{g}}$ 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 $T_{\text{g}}$. Crystallization temperature decreases with increasing lithium oxide concentration.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2005-09-15