Dynamics of strong and fragile glass formers: Differences and correlation with low-temperature properties.
Dynamics of strong and fragile glass formers: Differences and correlation with low-temperature properties.
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DOI：
10.1103/physrevlett.71.2062
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发表时间：
1993-09
影响因子：
8.6
通讯作者：
Sokolov;Rössler;Kisliuk;Quitmann
中科院分区：
文献类型：
--
作者：
Sokolov;Rössler;Kisliuk;Quitmann
在较宽的温度范围内测量了强、脆性玻璃形成液体的低频拉曼光谱。通过对光谱和文献资料的分析发现，动态结构因子的主要差异在于振动与弛豫贡献的比值：玻璃壁越坚固，该比值越高。结果表明，即使在极低的温度下，这种差异仍然存在，并决定了玻璃的低温异常。讨论了观察到的差异如何影响液体易碎性的一种可能方式。
Low-frequency Raman spectra of strong and fragile glass forming liquids were measured in a wide temperature range. From an analysis of the spectra and literature data it is found that the main difference in the dynamic structure factor is the ratio of vibrational to relaxational contributions: The stronger the glass former the higher this ratio. It is shown that this difference survives even at very low temperatures and determines the low-temperature anomalies of glasses. A possible way how the observed difference influences the fragility of a liquid is discussed.