Experimental evidence for the unusual damping parameter in L-arginine phosphate monohydrate single crystal

被引：1
作者：
Su, JR [1 ]
Zhu, CF
Zhu, ZG
Xu, D
Yuan, DR
机构：
[1] Acad Sinica, Inst Solid State Phys, Hefei 230031, Peoples R China
[2] USTC, Acad Sinica, Lab Internal Frict & Defects Solids, Beijing, Peoples R China
[3] Shandong Univ, Natl Lab Crystal Mat, Shandong, Peoples R China
来源：
MATERIALS RESEARCH BULLETIN | 2000年 / 35卷 / 06期
关键词：
organic compounds; ultrasonic measurements; acoustical properties; defects;
D O I：
10.1016/S0025-5408(00)00286-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The longitudinal ultrasonic attenuation and velocity of L-arginine phosphate monohydrate (LAP) single crystal were investigated at 11.6, 15, and 30 MHz from 160 to 300 K during heating. An internal friction peak was found in all experiments. The frequency dependence of this peak indicates that it is associated with dislocation resonance damping. Although it is generally believed that the damping parameter B in the vibrating-string model of dislocation damping is approximately proportional to the temperature in metals, our results indicate that in LAP single crystal, parameter B can be expressed as B proportional to tau = me(-n/T), where tau is the relaxation time, T is the temperature, and m and n are positive constants. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：977 / 983
页数：7
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