INVESTIGATION OF THE 2ND ULTRASONIC HARMONIC-GENERATION IN SN2P2S6 AND SN2P2SE6 CRYSTALS

被引：13
|
作者：
SAMULIONIS, V [1 ]
VALEVICHIUS, V [1 ]
GRIGAS, J [1 ]
VYSOCHANSKY, YM [1 ]
机构：
[1] UZHGOROD STATE UNIV,DEPT PHYS,UZHGOROD,UKRAINE,USSR
来源：
FERROELECTRICS | 1990年 / 105卷
关键词：
D O I：
10.1080/00150199008224675
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The results of the second longitudinal ultrasonic harmonic measurements in ferroelectric semiconductive Sn2P2S6and Sn2P2Se6crystals in the vicinity of phase transitions are presented for X crystallographic direction. It is shown, that there are unusual anomalies of the second harmonic amplitude at the phase transition region. Such harmonic behaviour is determined by the increase of acoustic nonlinearity and also by the ultrasonic attenuation maximum at the phase transition temperature. The temperature dependences of the nonlinear elastic coefficients for Sn2P2S6and Sn2P2Se6crystals have been calculated using ultrasonic data. The elastic nonlinearity is markedly higher in the temperature interval where an incommensurate phase exists. © 1990, Taylor & Francis Group, LLC. All rights reserved.
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收藏
页码：397 / 402
页数：6
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