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dc.contributor.authorGhaffari, M.en_US
dc.contributor.authorLiu, T.en_US
dc.contributor.authorHuang H.en_US
dc.contributor.authorTan O.K.en_US
dc.contributor.authorShannon, M.en_US
dc.date.accessioned2016-02-08T09:44:22Z
dc.date.available2016-02-08T09:44:22Z
dc.date.issued2012en_US
dc.identifier.issn0254-0584
dc.identifier.urihttp://hdl.handle.net/11693/21294
dc.description.abstractIn this study, the STF x photocatalyst powder was synthesized with a high temperature solid state reaction. The microstructures and surface of samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The electronic properties and local structure of the perovskite STF x (0 ≤ x ≤ 1) systems were probed by extended X-ray absorption fine structure (EXAFS) spectroscopy. The XPS results revealed that with increasing iron doping, the amount of Fe 3+ and Fe 4+ increased significantly. The X-ray absorption data are discussed in detail with respect to the Fe (Ti) K-edge. The substitution of iron by titanium increased the Ti (Fe)-O first shell disorder factors that can be explained by increasing the oxygen vacancies. Oxygen vacancies or defects act as electron traps, which could capture the photo induced electrons and thus could effectively inhibit the recombination of the photo induced electrons and holes. Moreover due to the substitution of Ti with Fe, lattice shrinkage was observed and the largest derivation from the Gaussian distribution in STF x was from those samples with x = 0.6 and x = 0.8. The substitution of iron by titanium increased the iron valence state, hence the formation of the Jahn-Teller Fe 4+ ion. With increasing iron dopant the [Ti(Fe)-O] ave decreased and bond length of [Ti-O] and the consequent [Ti-O-Ti] increased and this phenomenon affected the photocatalyst and photo degradation properties of material and also decreased its efficiency. © 2012 Elsevier B.V. All rights reserved.en_US
dc.language.isoEnglishen_US
dc.source.titleMaterials Chemistry and Physicsen_US
dc.relation.isversionofhttp://dx.doi.org/10.1016/j.matchemphys.2012.06.037en_US
dc.subjectCatalysten_US
dc.subjectOxygen vacanciesen_US
dc.subjectSrTi (1-x)Fe xO (3-δ)en_US
dc.subjectXAFSen_US
dc.subjectElectrons and holesen_US
dc.subjectEXAFSen_US
dc.subjectExtended X-ray absorption fine structuresen_US
dc.subjectHigh temperature solid-state reactionen_US
dc.subjectIron dopingen_US
dc.subjectIts efficienciesen_US
dc.subjectJahn-Telleren_US
dc.subjectLocal structureen_US
dc.subjectPhoto-induceden_US
dc.subjectTransmission electron microscopy temen_US
dc.subjectValence stateen_US
dc.subjectXAFSen_US
dc.subjectOxygen vacanciesen_US
dc.subjectCatalystsen_US
dc.titleInvestigation of local structure effect and X-ray absorption characteristics (EXAFS) of Fe (Ti) K-edge on photocatalyst properties of SrTi (1-x)Fe xO (3-δ)en_US
dc.typeArticleen_US
dc.departmentDepartment of Electrical and Electronics Engineering
dc.departmentUNAM - Institute of Materials Science and Nanotechnology
dc.citation.spage347en_US
dc.citation.epage357en_US
dc.citation.volumeNumber136en_US
dc.citation.issueNumber2-3en_US
dc.identifier.doi10.1016/j.matchemphys.2012.06.037en_US


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