EFFECTIVE MEDIUM APPROXIMATION FOR VIBRATIONAL EXCITATIONS IN DISORDERED SOLIDS

被引：1
|
作者：
WAGENER, M
SCHIRMACHER, W
机构：
[1] Physik-Department E13, TU München
来源：
JOURNAL OF NON-CRYSTALLINE SOLIDS | 1992年 / 145卷 / 1-3期
关键词：
D O I：
10.1016/S0022-3093(05)80443-0
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：
The effective medium approximation (EMA) was applied to the investigation of the vibrational properties of disordered solids. EMA calculations were performed for models characterized by a continuous distribution of force constants and compared with calculations for a model with fractal topology characterized by a binary distribution of force constants. In all models, a strong derivation from the usual Debye-omega-2 law above a certain frequency omega-1 was found in the vibrational density of states. Experimental results for silica aerogels are used to discuss the relevance of our theory to this type of material.
引用
收藏
页码：136 / 140
页数：5
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