Structural and Chemical Factors Governing Anion Reactivity in Perovskite Oxides

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dc.contributor.advisorRodriguez, Efrain Een_US
dc.contributor.authorTaylor, Daniel Douglasen_US
dc.contributor.departmentMaterial Science and Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2017-09-13T05:37:09Z
dc.date.available2017-09-13T05:37:09Z
dc.date.issued2017en_US
dc.description.abstractTopochemical reactions - those in which the composition of a material is modified while its overall structure is left largely intact - are the basis of numerous technologies such as battery electrodes and CO2 capture. This dissertation outlines our efforts to understand the underlying chemical and structural factors controlling the outcome of these reactions. With a focus on the anion sublattice in perovskite-type oxides, this research was performed as part of two projects. First, we explored the use of topochemical oxygen removal reactions for the preparation of new functional materials with potential application in next generation computing. Through this effort, we successfully synthesized the first example of ferromagnetic cubic Sr2FeMoO6 suggesting the possibility of raising the magnetic ordering temperature, and therefore the degree of spin polarization, of this material through topochemical treatments. Second, we investigated the ability to use complex transition metal oxides as oxygen storage materials for new chemical-looping technologies. For example, our studies of La(1-x)Sr(x)FeO(3-d) yielded two primary findings -- cycling reaction kinetics are strongly dependent on Sr content and each sample has an envelope of oxygen storage capacity over a set temperature and atmospheric composition. These projects both used advanced diffraction techniques, neutron and synchrotron X-ray, to study the structure of materials in-situ in order to link their structure to their properties. Furthermore, through this research we developed tools for the rapid refinement of large sets of powder diffraction patterns thus speeding up the rate at which the data from high-speed in-situ diffraction experiments can be analyzed and presented.en_US
dc.identifierhttps://doi.org/10.13016/M2J678X2Q
dc.identifier.urihttp://hdl.handle.net/1903/19815
dc.language.isoenen_US
dc.subject.pqcontrolledMaterials Scienceen_US
dc.subject.pqcontrolledChemistryen_US
dc.subject.pqcontrolledChemical engineeringen_US
dc.subject.pquncontrolledChemical-Looping Reactionsen_US
dc.subject.pquncontrolledIn-situ Diffractionen_US
dc.subject.pquncontrolledMethane Reformingen_US
dc.subject.pquncontrolledOxygen Storage Materialsen_US
dc.subject.pquncontrolledPerovskitesen_US
dc.subject.pquncontrolledTopochemical Reactionsen_US
dc.titleStructural and Chemical Factors Governing Anion Reactivity in Perovskite Oxidesen_US
dc.typeDissertationen_US

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