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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 >Relationship between viscous dynamics and the configurational thermal expansion coefficient of glass-forming liquids
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Relationship between viscous dynamics and the configurational thermal expansion coefficient of glass-forming liquids

机译：粘滞动力学与玻璃形成液的构型热膨胀系数之间的关系

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摘要

We propose a model to describe the relationship between the viscosity of a glass-forming liquid and its configurational contribution to liquid state thermal expansion. The viscosity of the glass-forming liquids is expressed in terms of three standard parameters: the glass transition temperature (T _g), the liquid fragility index (m), and the extrapolated infinite temperature viscosity (η _∞), which are obtained by fitting of the Mauro-Yue-Ellison-Gupta-Allan (MYEGA) expression to measured viscosity data. The model is tested with experimental data for 41 different glass-forming systems. A good correlation is observed between our model viscosity parameter,h(T_g, m, η _∞), and the configurational coefficient of thermal expansion (i.e., the configurational CTE). Within a given class of glass compositions, the model offers the ability to predict trends in configurational CTE with changes in viscosity parameters. Since viscosity is governed by glass network topology, the model also suggests the role of topological constraints in governing changes in configurational CTE.
机译：我们提出了一个模型来描述玻璃形成液的粘度与其对液态热膨胀的构型贡献之间的关系。玻璃形成液的粘度用以下三个标准参数表示：玻璃化转变温度（T _g），液体脆性指数（m）和外推无限温度粘度（η_∞），这些参数通过将Mauro-Yue-Ellison-Gupta-Allan（MYEGA）表达式与测得的粘度数据进行拟合。该模型已使用41种不同玻璃成型系统的实验数据进行了测试。在我们的模型粘度参数h（T_g，m，η_∞）与热膨胀的组态系数（即组态CTE）之间观察到良好的相关性。在给定的玻璃成分类别中，该模型提供了随着粘度参数的变化预测构型CTE趋势的能力。由于粘度是由玻璃网络拓扑控制的，因此该模型还提出了拓扑约束在控制构型CTE变化中的作用。

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