期刊
JOURNAL OF CHEMICAL PHYSICS
卷 135, 期 17, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3656697
关键词
boson systems; Debye temperature; elastic constants; germanium compounds; glass transition; melting point; vibrational states; vitreous state
资金
- European Commission [Rll3-CT-2003-505925]
We report on the observation of a significant softening of the Boson peak (BP) frequency of vitreous GeO2 above the glass transition temperature. The softening reminds a critical trend, with a transition temperature intermediate between the glass transition temperature, T-g, and the melting point. The softening of the BP frequency corresponds to a transition from a region dominated by Debye scaling to a non-Debye one. Below T-g the density of vibrational states varies according to the modification of the elastic continuum medium. Above T-g the relevant softening of the BP modes can be explained by a broadening of the distribution of elastic constants between neighboring atoms, induced by the structural rearrangement. These findings are discussed together with recent experimental and theoretical results on the low frequency vibrations in glasses. (C) 2011 American Institute of Physics. [doi:10.1063/1.3656697]
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