At present, we are witnessing a renewed interest in the properties of densified glasses prepared by isobaric cooling of a liquid at elevated pressure. As high-pressure densification emerges as a promising approach in the development of glasses with customized features, understanding and controlling their unique properties represent a contemporary scientific and technological goal. The results presented herein indicate that the applied high-pressure preparation route leads to a glassy state with higher density (∼1%) and a reduced free volume of about 7%. We show that these subtle structural changes remarkably influence the dielectric response and spectral features of β-relaxation in etoricoxib glass. Our study, combining dynamical and structural techniques, reveal that β-relaxation in etoricoxib is extremely sensitive to the variations in molecular packing and can be used to probe the changes in glass density. Such connection is technologically relevant and may advance further progress in the field.

中文翻译：

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玻璃密度的介电特征

目前，我们目睹了人们对通过高压等压冷却液体制备的致密玻璃的特性重新产生兴趣。随着高压致密化成为开发具有定制特征的玻璃的一种有前途的方法，了解和控制其独特的特性代表了当代科学和技术目标。此处呈现的结果表明，应用高压制备途径导致具有更高密度（~1%）和约 7% 减少的自由体积的玻璃态。我们表明，这些细微的结构变化显着影响了依托考昔玻璃中 β-弛豫的介电响应和光谱特征。我们的研究，结合动力和结构技术，揭示 etoricoxib 中的 β-弛豫对分子堆积的变化极为敏感，可用于探测玻璃密度的变化。这种连接在技术上是相关的，可能会推动该领域的进一步发展。