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Assessing the oxidation states and structural stability of the Ce analogue of brannerite

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dc.contributor.authorAluri, Esther Rani
dc.contributor.authorBachiu, Lisa
dc.contributor.authorGrosvenor, Andrew
dc.contributor.authorForbes, Scott
dc.contributor.authorGreedan, John
dc.date.accessioned2018-05-02T16:14:53Z
dc.date.available2018-05-02T16:14:53Z
dc.date.issued2017
dc.description.abstractThe Ce‐containing analogue of brannerite (ie, UTi2O6) was previously considered to be stoichio- metric (ie, CeTi2O6); however, it has recently been determined that the material is O deficient. This oxygen‐deficient material has been suggested to be charged balanced by the presence of a minor concentration of Ce3+ or by the A‐site being cation deficient with the Ce oxidation state being 4+. A variety of Ti‐containing oxides (including brannerite) have been investigated as potential nuclear wasteforms, and it is necessary to understand the electronic structure of a proposed nuclear wasteform material as well as how the structure responds to radiation from incorporated waste elements. The radiation resistance of a material can be simulated by ion implantation. The objective of this study was to confirm the Ce oxidation state in the cation‐ and oxygen‐deficient material (ie, Ce0.94Ti2O6 − δ) and to determine how radiation damage affects this material. X‐ray photoelectron spectroscopy (XPS) and X‐ray absorption near‐edge spectros- copy were used to study Ce0.94Ti2O6 − δ before and after being implanted with 2 MeV Au− ions. Analysis of the Ce 3d XPS spectra from the as‐synthesized samples by using a previously developed fitting method has unequivocally shown that Ce adopts both 4+ (major) and 3+ (minor) oxidation states, which was confirmed by examination of magnetic susceptibility data. Analysis of XPS and X‐ray absorption near‐edge spectroscopy spectra from ion‐implanted materials showed that both Ce and Ti were reduced because of radiation damage and that the local coordination environments of the cations are greatly affected by radiation damage.en_US
dc.description.sponsorshipNSERCen_US
dc.identifier.citationSurf Interface Anal. 2017;49:1335–1344.en_US
dc.identifier.urihttp://hdl.handle.net/10388/8559
dc.language.isoenen_US
dc.publisherWileyen_US
dc.subjectbranneriteen_US
dc.subjection implantationen_US
dc.subjectmagnetic susceptibilityen_US
dc.subjectnuclear wasteform,en_US
dc.subjectXANESen_US
dc.subjectXPSen_US
dc.subjectXRDen_US
dc.titleAssessing the oxidation states and structural stability of the Ce analogue of branneriteen_US
dc.typeArticleen_US

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