Nanoindentation Based Estimates of Flexoelectric Properties of Piezoelectric Crystals

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dc.contributor.advisorWhite, Kenneth W.
dc.contributor.committeeMemberSharma, Pradeep
dc.contributor.committeeMemberAgrawal, Ashutosh
dc.creatorRobinson, Cody
dc.date.accessioned2017-05-14T02:40:46Z
dc.date.available2017-05-14T02:40:46Z
dc.date.createdMay 2012
dc.date.issued2012-05
dc.date.submittedMay 2012
dc.date.updated2017-05-14T02:40:46Z
dc.description.abstractFlexoelectricity refers to coupling between electric polarization and strain gradients in crystalline dielectrics. Recent work has shown that stiffness data obtained by nanoindentation, combined with an analytical indentation model that predicts size dependent behavior attributable to flexoelectricity, may be used to characterize flexoelectric properties of piezoelectric crystals. In the present work this experimental-analytical method is used and evaluated based on nanoindentation of quartz, lithium niobate, lithium tantalate, lead magnesium niobate - 30% lead titanate, and barium titanate with Berkovich, cone, and cube corner indenters. Flexoelectric properties appear negligible in quartz and are estimated to be on the order of 10^-9C/m to 10^-8C/m in lithium niobate and lithium tantalate, and around 10^-4C/m for barium titanate and PMN-30%PT. The results for quartz agree with previous work, the results for barium titanate conflict, and those for the remaining materials are original and justifiable. Implications of the approach are discussed at length. The methodology in its current state is practical for specific types of dielectric crystals.
dc.description.departmentMechanical Engineering, Department of
dc.format.digitalOriginborn digital
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/10657/1763
dc.language.isoeng
dc.rightsThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).
dc.subjectFlexoelectricity
dc.subjectPiezoelectric
dc.subjectLithium niobate
dc.subjectLiNbO3
dc.subjectLithium tantalate
dc.subjectLiTaO3
dc.subjectQuartz
dc.subjectBarium titanate
dc.subjectBaTiO3
dc.subjectLead magnesium niobate
dc.subjectPMNT
dc.subjectPMN-PT
dc.subjectNanoindentation
dc.subjectFerroelectricity
dc.subjectDielectric
dc.subjectSize effect
dc.titleNanoindentation Based Estimates of Flexoelectric Properties of Piezoelectric Crystals
dc.type.dcmiText
dc.type.genreThesis
thesis.degree.collegeCullen College of Engineering
thesis.degree.departmentMechanical Engineering, Department of
thesis.degree.disciplineMaterials Engineering
thesis.degree.grantorUniversity of Houston
thesis.degree.levelMasters
thesis.degree.nameMaster of Science

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