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dc.contributor.authorSong, Qingen_US
dc.date.accessioned2006-01-19T21:08:16Z
dc.date.available2006-01-19T21:08:16Z
dc.date.issued2005-08-26en_US
dc.identifier.urihttp://hdl.handle.net/1853/7645
dc.description.abstractSize and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals Qing Song 216 pages Directed by Dr. Z. John Zhang The correlationship between magnetic properties and magnetic couplings is established through the investigations of various cubic spinel ferrite nanocrystals. The results of this thesis contribute to the knowledge of size and shape controlled synthesis of various spinel ferrites and core shell architectured nanocrystals as well as the nanomagnetism in spinel ferrites by systematically investigating the effects of spin orbital coupling, magnetocrystalline anisotropy, exchange coupling, shape and surface anisotropy upon superparamagnetic properties of spinel ferrite nanocrystals. A general synthetic method is developed for size and shape control of metal oxide nanocrystals. The size and shape dependent superparamagnetic properties are discussed. The relationship between spin orbital coupling and magnetocrystalline anisotropy is studied comparatively on variable sizes of spherical CoFe2O4 and Fe3O4 nanocrystals. It also addresses the effect of exchange coupling between magnetic hard phase and soft phase upon magnetic properties in core shell structured spinel ferrite nanocrystals. The role of anisotropic shapes of nanocrystals upon self assembled orientation ordered superstructures are investigated. The effect of thermal stability of molecular precursors upon size controlled synthesis of MnFe2O4 nanocrystals and the size dependent superparamagnetic properties are described.en_US
dc.format.extent15014896 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectSpinel ferriteen_US
dc.subjectSuperparamagnetism
dc.subjectSynthesis
dc.subjectNanocrystals
dc.subjectSize and shape control
dc.subjectSuperlattices
dc.subjectSuperstructures
dc.subject.lcshNanoparticles Magnetic propertiesen_US
dc.subject.lcshSpinel group Magnetic propertiesen_US
dc.subject.lcshFerrites (Magnetic materials)en_US
dc.subject.lcshFerromagnetismen_US
dc.subject.lcshNanocrystalsen_US
dc.titleSize and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystalsen_US
dc.typeDissertationen_US
dc.description.degreePh.D.en_US
dc.contributor.departmentChemistry and Biochemistryen_US
dc.description.advisorCommittee Chair: Zhang, John; Committee Member: Barefield, Kent; Committee Member: El-Sayed, Mostafa; Committee Member: Wang, ZhongLin; Committee Member: Wilkinson, Angusen_US


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