Glass Transitions and Elastic Properties of Lithium Borate Glasses over a Wide Composition Range Studied by Micro-Brillouin Scattering

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The elastic properties of lithium borate glasses, denoted by the composition formula $x$Li2O$\cdot$($100 - x$)B2O3 where $x$ is the molar concentration in mol %, have been investigated over a wide composition range $6 \leq x \leq 52$ mol % by micro-Brillouin scattering. From the observed values of the longitudinal and transverse sound velocities, the elastic constants such as longitudinal modulus, shear modulus, Young’s modulus, and Poisson’s ratio have been determined. The elastic constants have shown a strong composition dependence due to the variation of intermediate structural units. The temperature dependences of the longitudinal sound velocity and absorption coefficient of 44Li2O$\cdot$56B2O3 clearly show the anomalies at the glass transition and crystallization temperatures.
2008-05-25