Laboratoire de Physico-Chimie des Matériaux Luminescents, Domaine scientifique de la Doua, Université de Lyon, Université Lyon-1, UMR5620 CNRS, Bât. Kastler, 10 rue Ada Byron, 69622 Villeurbanne, France.
J Chem Phys. 2011 Jun 21;134(23):234503. doi: 10.1063/1.3599939.
We present low-frequency Raman scattering of pure GeO(2) glass under pressure up to 4 GPa, corresponding to an elastic transformation. Intensity variation and frequency shift of the boson peak are analysed and compared to the Debye model. The decrease of the boson peak intensity scaled by the Debye energy is correlated to the elastic anomalous properties under pressure up to 1.5 GPa, and interpreted as an elastic homogenisation process at the local scale. We emphasize similarities between a-GeO(2) and a-SiO(2) behavior under pressure, and compare our results to other experiments, numerical studies, and predictions of several models concerning amorphous systems.
我们展示了纯 GeO(2) 玻璃在高达 4 GPa 的压力下的低频 Raman 散射，这对应于弹性转变。分析了声子峰的强度变化和频率位移，并与德拜模型进行了比较。声子峰强度按德拜能标减小的部分与高达 1.5 GPa 压力下的弹性异常性质相关联，并解释为局部尺度上的弹性均匀化过程。我们强调了非晶 a-GeO(2) 和 a-SiO(2) 在压力下的行为之间的相似性，并将我们的结果与其他实验、数值研究以及关于非晶体系的几个模型的预测进行了比较。
