Origin of boson peak in glasses: Role of Ioffe-Regel crossover and atomic soft modes

被引：3

作者：

Klinger, Michael I. ^{[1
]}

机构：

[1] Bar Ilan Univ, Dept Phys, IL-52900 Tel Aviv, Israel

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2007年 / 353卷 / 18-21期

关键词：

glasses; nitride glasses; infrared glasses; chalcogenides; oxide glasses; alkali silicates; borates; thermal properties; thermal conductivity;

D O I：

10.1016/j.jnoncrysol.2007.01.050

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A theoretical 'complete soft-mode-dynamics' model of the origin and properties of the boson peak accompanied by a high-frequency sound, observed in glasses of a certain type, is described. The origin is determined by interaction of non-acoustic vibrations with acoustic phonons and a loffe-Regel crossover for their inelastic scattering. The non-acoustic excitations are associated with vibrations of atomic soft-mode 'defects'. Two types of boson peak can be predicted in agreement with experiments. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：1824 / 1827

页数：4

共 47 条

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[42] Boson peak in Sm-Al-Co ternary metallic glasses and its possible structural origin
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[44] High-pressure phenomena in glasses: The role of soft atomic configurations
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[45] Separation of soft-mode and acoustic dynamics in the boson peak of glasses: vast difference in high-pressure effects
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[46] The boson peak of silicate glasses: The role of Si-O, Al-O, and Si-N bonds
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[47] Soft-mode-dynamics model of acoustic-like high-frequency excitations in boson-peak spectra of glasses
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