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Memorial University - Electronic Theses and Dissertations 4
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Document Description
TitleInvestigation of the effect of uniaxial stress on the elastic properties of Rb4LiH3(SO4)4
AuthorRahman, Mohammad Mahbubur, 1977-
DescriptionThesis (M.Sc.)--Memorial University of Newfoundland, 2009. Physics and Physical Oceanography
Date2009
Paginationxiii, 102 leaves : ill.
SubjectAxial loads; Crystals at low temperatures; Ferroelastic crystals--Elastic properties;
DegreeM.Sc.
Degree GrantorMemorial University of Newfoundland. Dept. of Physics and Physical Oceanography
DisciplinePhysics and Physcial Oceanography
LanguageEng
NotesIncludes bibliographical references (leaves 98-102).
AbstractIn 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.
TypeText
Resource TypeElectronic thesis or dissertation
FormatImage/jpeg; Application/pdf
SourcePaper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifiera3243710
RightsThe 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.
CollectionElectronic Theses and Dissertations
Scanning StatusCompleted
PDF File(10.25 MB) -- http://collections.mun.ca/PDFs/theses/Rahman_MohammadMahbubur.pdf
CONTENTdm file name64784.cpd