Investigation of the effect of uniaxial stress on the elastic properties of rubidium lithium hydride...

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" Investigation of the effect of uniaxial stress on the elastic properties of rubidium lithium hydride sulfate "
Mohammad Mahbubur Rahman

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	53970
Doc. No	:	TL23924
Call number	:	‭MR57457‬
Main Entry	:	Mohammad Mahbubur Rahman
Title & Author	:	Investigation of the effect of uniaxial stress on the elastic properties of rubidium lithium hydride sulfate\ Mohammad Mahbubur Rahman
College	:	Memorial University of Newfoundland (Canada)
Date	:	2009
Degree	:	M.Sc.
student score	:	2009
Page No	:	117
Abstract	:	In this project, ultrasonic measurements have been used in order to observe the influence of uniaxial stress on the elastic properties of the ferroelastic compound Rb4LiH3 (SO4) 4. The experimental results are compared to predictions derived from a Landau model. In the experiment, uniaxial stresses either along [100] or [010] direction have been applied using two piezo-actuators mounted on opposite faces of the crystal. The temperature and pressure ranges for this investigation are 100–150K and 0–0.27 kbar, respectively. Throughout the investigation, it has been observed that in the absence of stress, the sound velocity along the x and z-axes shows a distinct step-like variation in the vicinity of the transition temperature, Tc = 134 K. The amplitude of the step-like variation is found to decrease with the application of a uniaxial stress. We believe that this is principally due to a reconfiguration of the domain distribution into the ferroelastic phase. This is supported by our Landau model which predicts no large variation over this pressure range.
Subject	:	Pure sciences; Low Temperature Physics; Condensed matter physics; 0598:Low Temperature Physics; 0611:Condensed matter physics
Added Entry	:	Memorial University of Newfoundland (Canada)