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dc.contributor.advisorChairperson, Graduate Committee: Yves U. Idzerdaen
dc.contributor.authorKarandi Pool, Vanessa LaVelleen
dc.contributor.otherM. T. Klem, J. Holroyd, T. Harris, E. A. Arenholz, M. Young, T. Douglas, and Y. U. Idzerda were co-authors of the article, 'Site determination of Zn doping in protein encapsulated Zn x Fe 3-x O 4 nanoparticles' in the journal 'Journal of applied physics' which is contained within this thesis.en
dc.contributor.otherM.T. Klem, C. Jolly, E. A. Arenholz, T. Douglas, M. Young, and Y.U. Idzerda were co-authors of the article, 'Site determination and magnetism of Mn doping in protein encapsulated iron oxide nanoparticles' in the journal 'Journal of applied physics' which is contained within this thesis.en
dc.contributor.otherC. Jolly, T. Douglas, E.A. Arenholz, and Y.U. Idzerda were co-authors of the article, 'Orbital moment determination in (Mn xFe 1-x) 3 O 4 nanoparticles' in the journal 'Journal of applied physics' which is contained within this thesis.en
dc.contributor.otherC. Jolly, Y.U. Idzerda, and T. Douglas were co-authors of the article, 'All in the packaging: structural and electronic effects of nanoconfinement on metal oxide nanoparticles' in the journal 'Chemistry of materials' which is contained within this thesis.en
dc.contributor.otherM.T. Klem, C.L. Chorney, E.A. Arenholz and Y.U. Idzerda were co-authors of the article, 'Enhanced magnetism of Fe 3O 4 nanoparticles with Ga doping' in the journal 'Journal of applied physics' which is contained within this thesis.en
dc.contributor.otherM. T. Klem, C.L. Chorney, E. A. Arenholz and Y. U. Idzerda were co-authors of the article, 'Enhanced magnetization in V xFe 3-x O 4 nanoparticles' which is contained within this thesis.en
dc.date.accessioned2013-06-25T18:37:27Z
dc.date.available2013-06-25T18:37:27Z
dc.date.issued2012en
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/1606en
dc.description.abstractThe dopant behavior of spinels has been investigated for over half a century and yet new insight into this class of materials is still being made today. The dominating question has been "Into which site in the spinel structure does the dopant substitute?". In this work, we will explore this question for the nanoparticle regime. Through this work the potential for a relaxation of the normal strains that can arise in a bulk crystal structure is demonstrated in nanoparticles. The hypothesis that this relaxation can lead to unconventional dopant site preferences for dopants in an iron oxide spinel structure is demonstrated. Nanoparticles ranging from 6 nm to 15 nm in diameter have been synthesized with vanadium, manganese, zinc and gallium doped into the iron oxide spinels. The size and structure of the nanoparticles was investigated with transmission electron microscope and X-ray scattering pair distribution functions. The dopant's valence state was investigated with X-ray absorption spectroscopy and the coordination and magnetic properties of the materials were investigated with X-ray magnetic circular dichroism. Alternating current magnetic susceptibility was used to determine the degree of interaction between the particles, and in the case of non-interacting particles, anisotropy energies were extracted. In this study the dopant atoms were found to behave similarly to their bulk counterparts, with the important exception of manganese and vanadium. Manganese doped iron-oxide nanoparticles show clear evidence of crystalline relaxation. Vanadium substituted into the preferred tetrahedral site in the nanoparticle form, unlike the bulk behavior. Both observations are attributed to the accommodating relaxation found in nanoparticles.en
dc.language.isoenen
dc.publisherMontana State University - Bozeman, College of Letters & Scienceen
dc.subject.lcshNanoparticlesen
dc.subject.lcshFerric oxideen
dc.subject.lcshSpinelen
dc.titleUnderstanding dopant site preferences in doped iron oxide nanoparticles : does a relaxed unit cell in nanoparticle alter the site preference within the spinel structure?en
dc.typeDissertationen
dc.rights.holderCopyright 2012 by Vanessa LaVelle Karandi Poolen
thesis.catalog.ckey1943856en
thesis.degree.committeemembersMembers, Graduate Committee: Richard J. Smith; John J. Neumeier; John L. Carlsten; V. Hugo Schmidten
thesis.degree.departmentPhysics.en
thesis.degree.genreDissertationen
thesis.degree.namePhDen
thesis.format.extentfirstpage1en
thesis.format.extentlastpage165en


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