Abstract

The density of glass with a composition of 20Na₂O ∙ 80B₂O₃ (mol %) (glass transition temperature T_g = 450°С) during stabilization in the temperature range 390−424°С and the temperature dependence of the density of the stabilized glass in the range 390–469°С are studied. We aim to study the temperature dependence of the density of stabilized glass d_s lower than the glass transition temperature. The density is determined after quenching the samples at room temperature by hydrostatic weighing in kerosene with an accuracy of ±0.0005 g/cm³. It is found that, in the temperature range 450−420°C, density d_s increases linearly with decreasing temperature. In the range 420−402°C, there is a deviation from the linear dependence d_s(T) towards lower density values. At 390°C, after reaching the stabilized state of the glass, the density obtained is the same as at 402°C. For this glass, the existence of temperature T_s = 402°C (48°C less than T_g) is established, below which the structure of stabilized glass ceases to change.

中文翻译：

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低于玻璃化转变温度的温度下稳定硼酸钠玻璃密度的温度依赖性

摘要

在390-424°С温度范围内稳定期间，组成为20Na ₂ O∙80B ₂ O ₃（mol％）（玻璃化转变温度T _g = 450°С）的玻璃的密度及其密度的温度依赖性研究了390–469°С范围内的稳定玻璃。我们旨在研究低于玻璃化转变温度的稳定玻璃密度d _s的温度依赖性。在室温下通过在煤油中进行静水称量以±0.0005 g / cm ³的精度对样品进行淬火后确定密度。发现在450-420°C的温度范围内，密度d _s随着温度降低线性增加。在420-402°C范围内，线性相关性d _s（T）向较低的密度值存在偏差。在390℃下，在达到玻璃的稳定状态后，获得的密度与402℃下的密度相同。对于这种玻璃，确定存在温度T _s = 402°C（比T _g少48°C ），在该温度以下，稳定化的玻璃的结构停止变化。