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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 >Microscopic dynamics and viscous flow in a borosilicate glass-forming liquid
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Microscopic dynamics and viscous flow in a borosilicate glass-forming liquid

机译：硼硅酸盐玻璃形成液中的微观动力学和粘性流

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摘要

The connections between microscopic dynamical processes and macroscopic viscous transport are not well known in multi-component oxide liquids, despite their importance in the glass industry and in the earth sciences. Here, rates of exchange among both silicate and berate network species in an alkali borosilicate liquid are derived from high temperature boron-ll and silicon-29 magic angle spinning nuclear magnetic resonance spectroscopy. About 80 degrees C above the glass transition, exchange rates of both types of units are close to the shear relaxation time calculated from the bulk viscosity. However, at lower temperatures, the silicon exchange rates decouple from the viscosity curve, possibly because of the development of intermediate-range compositional heterogeneities. (C) 1998 Elsevier Science B.V. [References: 23]
机译：尽管微观动力学过程与宏观粘性传输之间的联系在玻璃工业和地球科学中很重要，但在多组分氧化物液体中却鲜为人知。在此，碱金属硼硅酸盐液体中的硅酸盐和贝特酸盐网络物种之间的交换速率来自高温硼II和29硅魔角旋转核磁共振波谱。在玻璃化转变温度之上约80摄氏度，两种类型单元的交换速率均接近于由体积粘度计算得出的剪切松弛时间。但是，在较低的温度下，硅交换速率与粘度曲线会脱钩，这可能是由于中等范围成分异质性的发展所致。 （C）1998 Elsevier Science B.V. [参考：23]

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