Memorial University DAI: Investigation of the effect of uniaxial stress on the elastic properties of Rb4LiH3(SO4)4

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Title	Investigation of the effect of uniaxial stress on the elastic properties of Rb4LiH3(SO4)4
Author	Rahman, Mohammad Mahbubur, 1977-
Description	Thesis (M.Sc.)--Memorial University of Newfoundland, 2009. Physics and Physical Oceanography
Date	2009
Pagination	xiii, 102 leaves : ill.
Subject	Axial loads; Crystals at low temperatures; Ferroelastic crystals--Elastic properties;
Degree	M.Sc.
Degree Grantor	Memorial University of Newfoundland. Dept. of Physics and Physical Oceanography
Discipline	Physics and Physcial Oceanography
Language	Eng
Notes	Includes bibliographical references (leaves 98-102).
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 Rb4 LiH3 (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 arc 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.
Type	Text
Resource Type	Electronic thesis or dissertation
Format	Image/jpeg; Application/pdf
Source	Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifier	a3243710
Rights	The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
Collection	Electronic Theses and Dissertations
Scanning Status	Completed
PDF File	(10.25 MB) -- http://collections.mun.ca/PDFs/theses/Rahman_MohammadMahbubur.pdf
CONTENTdm file name	64784.cpd