Abstract

Glass-forming systems based on GeS_x have a wide practical application. Therefore, their crystallization from supercooled melt was studied in many works, mainly by differential scanning calorimetry and X-ray powder diffraction analysis. Explanation of the experimentally determined crystallization behavior using the thermodynamic method of Gibbs energy minimization enabled one to develop a predictive procedure for identifying the crystallizing phases and the temperature conditions of their separation, depending on the initial composition of the GeS_xBi_0.02 glass (x = 1.25, 1.35, 1.4, and 1.6), and also allowed one to formulate a thermodynamic factor of crystallization resistance of glass. Comparison of the Gibbs energy calculated using the associated solution model with the Gibbs energy values obtained experimentally in the supercooled solution region made it possible to find the standard enthalpy of formation for each glass composition. Finally, the supersaturation to crystallization, which is the basis of the thermodynamic factor of crystallization and is an index of the crystallization resistance of glass, is determined by the difference of the chemical potentials of a component of the glass-forming system in the crystalline state and in the supercooling solution state. The procedure to predict and choose crystallization-resistant glasses promotes technological developments of novel fiber optic light guides.

中文翻译：

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Ge-S-Bi玻璃结晶电阻的热力学分析

摘要

基于 GeS _{x 的}玻璃形成系统具有广泛的实际应用。因此，在许多工作中研究了它们在过冷熔体中的结晶，主要是通过差示扫描量热法和 X 射线粉末衍射分析。使用吉布斯能量最小化的热力学方法对实验确定的结晶行为进行解释，使人们能够开发一种预测程序来识别结晶相和它们分离的温度条件，这取决于 GeS _x Bi _0.02玻璃的初始组成（x= 1.25, 1.35, 1.4, 和 1.6)，并且还允许制定玻璃抗结晶性的热力学因子。将使用相关溶液模型计算的吉布斯能量与在过冷溶液区域通过实验获得的吉布斯能量值进行比较，可以找到每种玻璃组合物的标准形成焓。最后，结晶的过饱和度是结晶热力学因素的基础，是玻璃抗结晶性的指标，由结晶态玻璃形成系统组分的化学势差决定并处于过冷溶液状态。