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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Deceleration of surface structural relaxation in chlorine-containing silica glass due to chlorine volatilization
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Deceleration of surface structural relaxation in chlorine-containing silica glass due to chlorine volatilization

机译：氯气挥发导致含氯石英玻璃表面结构松弛的减弱

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摘要

Both surface and bulk fictive temperatures of chlorine-containing silica glass were measured using the IR method, after thermal, mechanical and chemical treatments. A metastable equilibrium state at 1200 degrees C was first established for the glass by heat-treatment and a uniform fictive temperature was observed except for the sample surface created by polishing after the heat-treatment. The densified layer of the polished surface shifted the IR peak wavenumber, making the fictive temperature appear higher than the bulk. During the second heat-treatment at 950 degrees C, the sample with the as-heat-treated surface and uniform fictive temperature of 1200 degrees C developed non-uniform fictive temperature distribution with the bulk fictive temperature becoming lower than the surface fictive temperature. Usually, surface structural relaxation is faster than bulk structural relaxation and the surface fictive temperature becomes lower than the bulk fictive temperature when heat-treated at a lower temperature than the initial fictive temperature. The observed anomalous feature was attributed to chlorine volatilization from the glass surface layer creating a high viscosity surface layer. This conclusion was supported by the diffusion data of chlorine in the glass available in the literature. (c) 2007 Elsevier B.V. All rights reserved.
机译：经过热处理，机械和化学处理后，使用红外法测量了含氯石英玻璃的表面和体积虚拟温度。首先通过热处理在1200℃下建立亚稳态平衡状态，并且观察到均匀的虚拟温度，除了热处理后通过抛光产生的样品表面。抛光表面的致密层移动了IR峰值波数，从而使虚构温度看起来高于整体温度。在950℃的第二次热处理期间，具有被热处理的表面和一致的假想温度为1200℃的样品形成了不均匀的假想温度分布，总体假想温度低于表面假想温度。通常，当在比初始虚拟温度低的温度下进行热处理时，表面结构松弛比整体结构松弛快，并且表面虚拟温度变得低于整体虚拟温度。观察到的异常特征归因于玻璃表面层中的氯挥发，从而形成了高粘度表面层。该结论得到了文献中可用的氯在玻璃中的扩散数据的支持。 （c）2007 Elsevier B.V.保留所有权利。

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