Type of Document Master's Thesis Author Wang, Naigang Author's Email Address email@example.com URN etd-07012005-173326 Title Multiferroic Bismuth Ferrite-Lead Titanate and Iron-Gallium Crystalline Solutions: Structure-Property Investigations Degree Master of Science Department Materials Science and Engineering Advisory Committee
Advisor Name Title Viehland, Dwight D. Committee Chair Li, Jie-Fang Committee Member Reynolds, William T. Jr. Committee Member Keywords
- Multiferroic; Bismuth ferrite; Iron gallium; Ferro
Date of Defense 2005-05-17 Availability unrestricted 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
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