R.B. Pena , T. Deschamps , S. Le Floch , A. Berthelot , E. Romeo , T.R. Cunha , O. Peitl , A.D. Rodrigues , C. Martinet , P.S. Pizani
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引用次数: 0
摘要
在本研究中，我们研究了不同压缩路径对偏硅酸铅（PbSiO3）成分的影响。在室温（冷压缩）和高达 673 K 的高温（热压缩）条件下，玻璃样品在贝尔特压力机中被压缩至 5 GPa。布里渊光谱、拉曼光谱和红外光谱对这组致密化玻璃进行了原位分析，提供了多尺度结构探测。数据集显示，冷压缩时折射率加权纵向声速逐渐减小，热压缩时在约 450 K 时达到最小值。拉曼和红外分析表明，硅酸盐网络的解聚作用在不断增强，这是致密化的一种效应，在温度较高时更为明显。此外，还讨论了压缩处理导致的固有结构改变所带来的不同机械特性。
Cold- and hot-densification of a depolymerized glass: A multiscale vibrational investigation of PbSiO3
In this study, we investigated the effect of different compression routes on the lead metasilicate (PbSiO3) composition. Glass samples were compressed in a Belt press up to 5 GPa at room temperature (cold compression) and high temperatures (hot compression) up to 673 K, both at comparable experimental conditions concerning pressure and temperature gradients and times. The set of densified glasses was analyzed ex-situ by Brillouin, Raman and infrared spectroscopies, providing a multiscale structural probe. The dataset revealed a progressive decrease in the refractive index-weighted longitudinal sound velocities for the cold-compression and a minimum at about 450 K for hot-compression. Raman and infrared analyses indicate increasing depolymerization of the silicate network as an effect of densification, which is more pronounced at higher temperatures. Moreover, distinct mechanical properties are discussed regarding the inherent structural modifications resulting from the compression treatments.
期刊介绍：
The Journal of Non-Crystalline Solids publishes review articles, research papers, and Letters to the Editor on amorphous and glassy materials, including inorganic, organic, polymeric, hybrid and metallic systems. Papers on partially glassy materials, such as glass-ceramics and glass-matrix composites, and papers involving the liquid state are also included in so far as the properties of the liquid are relevant for the formation of the solid.
In all cases the papers must demonstrate both novelty and importance to the field, by way of significant advances in understanding or application of non-crystalline solids; in the case of Letters, a compelling case must also be made for expedited handling.
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