Crystal chemistry and structures of (Ca,U) titanate pyrochlores

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dc.contributor.authorJames, Men_AU
dc.contributor.authorCarter, MLen_AU
dc.contributor.authorZhang, ZMen_AU
dc.contributor.authorZhang, YJen_AU
dc.contributor.authorWallwork, KSen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorVance, ERen_AU
dc.date.accessioned2010-10-25T23:15:05Zen_AU
dc.date.available2010-10-25T23:15:05Zen_AU
dc.date.issued2010-10-01en_AU
dc.date.statistics2010-10-01en_AU
dc.description.abstractAnalysis of multiphase (Ca,U) titanate pyrochlore samples produced under argon or in air, using laboratory X-ray powder diffraction (XRD) and electron microscopy revealed discrete pyrochlore phase compositions, together with either perovskite or rutile impurities. Investigations of these samples using diffuse reflectance and X-ray photoelectron spectroscopies revealed mixed U4+/U5+ oxidation states for argon-annealed samples and U5+/U6+ oxidation states for air-annealed samples. Single-phase (Ca1.25U4+0.25U5+0.50)Ti2O7 (argon) and (Ca1.40U5+0.60)(Ti1.90U6+0.10)O7 (air) compositions were synthesized and characterized using a combination of synchrotron X-ray and neutron powder diffraction. Severe intensity reduction of hkl odd XRD peaks from the sample produced in air was found to be the result of U6+ sharing the Ti site. The refined crystal structures for both single-phase samples were found to be consistent with the compositions and mixed oxidation states observed by the above spectroscopic measurements. Although the normalized uranium leach rate of the argon-annealed sample was found to be approximately twice that of the air-annealed sample, in 7-day Product Consistency Test the durability of both compounds with respect to leaching by water was found to be excellent. Ca releases were in the range of 0.01–0.03 g/L and U releases were <3 × 10−5 g/L. © 2010, Wiley-Blackwell.en_AU
dc.identifier.citationJames, M., Carter, M. L., Zhang, Z., Zhang, Y., Wallwork, K. S., Avdeev, M., & Vance, E. R. (2010). Crystal chemistry and structures of (Ca,U) titanate pyrochlores. Journal of the American Ceramic Society, 93(10), 3464-3473. doi:10.1111/j.1551-2916.2010.03871.xen_AU
dc.identifier.govdoc2943en_AU
dc.identifier.issn0002-7820en_AU
dc.identifier.issue10en_AU
dc.identifier.journaltitleJournal of the American Ceramic Societyen_AU
dc.identifier.pagination3464-3473en_AU
dc.identifier.urihttp://dx.doi.org/10.1111/j.1551-2916.2010.03871.xen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2763en_AU
dc.identifier.volume93en_AU
dc.language.isoenen_AU
dc.publisherWiley-Blackwellen_AU
dc.subjectTitanatesen_AU
dc.subjectPyrochloreen_AU
dc.subjectElectron microscopyen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectCrystal structureen_AU
dc.subjectArgonen_AU
dc.titleCrystal chemistry and structures of (Ca,U) titanate pyrochloresen_AU
dc.typeJournal Articleen_AU
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