Brillouin scattering in aluminosilicate glasses and melts up to 2550 K. Temperature and composition effects

Q1 Physics and Astronomy

Journal of Non-Crystalline Solids: X Pub Date : 2022-06-01 DOI:10.1016/j.nocx.2022.100086

Pascal Richet , Alain Polian , Dung Vo-Thanh , Yan Bottinga

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Abstract

Hypersonic sound velocities have been measured by Brillouin scattering for glasses and liquids of the system CaO-MgO-Al₂O₃-SiO₂ (CMAS). Transverse wave velocities are reported for ten samples from 293 up to temperatures ranging from 1000 to 1600 K, depending on composition, and longitudinal velocities for six samples from 293 to the interval 1890–2360 K. For the 13 CMAS compositions, the temperature dependences of acoustic velocities are constant within three temperature intervals: (i) from 293 K to the standard glass transition temperature T_g, (ii) from T_g, to the temperature T_rx of the onset of structural relaxation at the timescale of Brillouin scattering where transverse waves disappear, (iii) and finally above T_rx where only longitudinal waves thus remain observed. The implications of these results for structural relaxation, shear-wave propagation and shear modulus are then discussed.

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铝硅酸盐玻璃中的布里渊散射和熔体高达2550 K。温度和成分效应

用布里渊散射法测量了CaO-MgO-Al2O3-SiO2 (CMAS)体系的玻璃和液体的高超声速。报告了从293到温度范围从1000到1600 K(取决于成分)的10个样品的横波速度，以及从293到1890-2360 K区间的6个样品的纵波速度。对于13种CMAS成分，声速的温度依赖性在三个温度区间内是恒定的:(i)从293 K到标准玻璃化转变温度Tg， (ii)从Tg到布里因散射时间尺度上结构松弛开始的温度Trx，其中横波消失，(iii)最后在Trx以上，因此只观察到纵波。然后讨论了这些结果对结构松弛、剪切波传播和剪切模量的影响。

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