About the origin of the boson peak in vitreous silica

被引：9
|
作者：
Duval, E [1 ]
Mermet, A [1 ]
Le Parc, R [1 ]
Champagnon, B [1 ]
机构：
[1] Univ Lyon 1, CNRS, Unite Mixte Rech 5620, Lab Phys Chim Mat Luminescents, F-69622 Villeurbanne, France
来源：
PHILOSOPHICAL MAGAZINE | 2004年 / 84卷 / 13-16期
关键词：
D O I：
10.1080/14786430310001644189
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The long-standing issue of the boson peak in vitreous silica is revised in the light of new considerations about its nanometric structure. The shoulder at 7.5 nm(-1) that is visible in the structure factor of vitreous silica is an indication that there exists a quasiperiodicity with a period close to 1 nm. Using the results obtained earlier by inelastic X-ray scattering, it is deduced that the boson peak observed by inelastic light or neutron scattering in vitreous silica corresponds to a van Hove singularity associated with the Brillouin zone limit of a transverse acoustic band. This Brillouin zone is related to the quasiperiodicity revealed by the 7.5 nm(-1) correlation peak.
引用
收藏
页码：1433 / 1436
页数：4
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