Multiferroic Bismuth Ferrite-Lead Titanate and Iron-Gallium Crystalline Solutions: Structure-Property Investigations

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dc.contributor.authorWang, Naigangen
dc.contributor.committeechairViehland, Dwight D.en
dc.contributor.committeememberReynolds, William T. Jr.en
dc.contributor.committeememberLi, Jie-Fangen
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2014-03-14T20:40:57Zen
dc.date.adate2005-07-20en
dc.date.available2014-03-14T20:40:57Zen
dc.date.issued2005-05-17en
dc.date.rdate2005-07-20en
dc.date.sdate2005-07-01en
dc.description.abstractRecently, multiferroics-defined as materials with coexistence of at least two of the ferroelectric, ferroelastic and ferromagnetic effects-have attracted enormous research activities. In this thesis, the structure and properties of multiferrioic BiFeO3-x%PbTiO3 and Fe-x%Ga crystalline solutions were investigated. First, the results show that modified BiFeO3-PbTiO3 based ceramics have significantly enhanced multiferroic properties, relative to BiFeO3 single crystals. The data reveal: (i) a dramatic increase in the induced polarization; and (ii) the establishment of a remnant magnetization by a breaking of the translational invariance of a long-period cycloidal spin structure, via substituent effects. In addition, temperature dependent magnetic permeability investigations of BiFeO3-xPbTiO3 crystalline solutions have shown that aliovalent La substitution results in a significant increase in the permeability. Second, room temperature high-resolution neutron and x-ray diffraction studies have been performed on Fe-x%Ga crystals for 12<x<25at%. It has been observed that the structures of both Fe-12%Ga and Fe-25%Ga are tetragonal; however, near the phase boundary between them, an averaged-cubic structure was identified. In addition, an unusual splitting along the transverse direction indicates that the crystals are structurally inhomogeneous.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-07012005-173326en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07012005-173326/en
dc.identifier.urihttp://hdl.handle.net/10919/33854en
dc.publisherVirginia Techen
dc.relation.haspartThesis-naigang-wang.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectMultiferroicen
dc.subjectBismuth ferriteen
dc.subjectIron galliumen
dc.subjectFerroen
dc.titleMultiferroic Bismuth Ferrite-Lead Titanate and Iron-Gallium Crystalline Solutions: Structure-Property Investigationsen
dc.typeThesisen
thesis.degree.disciplineMaterials Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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