Crystal chemistry and structures of (Ca,U) titanate pyrochlores
dc.contributor.author | James, M | en_AU |
dc.contributor.author | Carter, ML | en_AU |
dc.contributor.author | Zhang, ZM | en_AU |
dc.contributor.author | Zhang, YJ | en_AU |
dc.contributor.author | Wallwork, KS | en_AU |
dc.contributor.author | Avdeev, M | en_AU |
dc.contributor.author | Vance, ER | en_AU |
dc.date.accessioned | 2010-10-25T23:15:05Z | en_AU |
dc.date.available | 2010-10-25T23:15:05Z | en_AU |
dc.date.issued | 2010-10-01 | en_AU |
dc.date.statistics | 2010-10-01 | en_AU |
dc.description.abstract | Analysis 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.citation | James, 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.x | en_AU |
dc.identifier.govdoc | 2943 | en_AU |
dc.identifier.issn | 0002-7820 | en_AU |
dc.identifier.issue | 10 | en_AU |
dc.identifier.journaltitle | Journal of the American Ceramic Society | en_AU |
dc.identifier.pagination | 3464-3473 | en_AU |
dc.identifier.uri | http://dx.doi.org/10.1111/j.1551-2916.2010.03871.x | en_AU |
dc.identifier.uri | http://apo.ansto.gov.au/dspace/handle/10238/2763 | en_AU |
dc.identifier.volume | 93 | en_AU |
dc.language.iso | en | en_AU |
dc.publisher | Wiley-Blackwell | en_AU |
dc.subject | Titanates | en_AU |
dc.subject | Pyrochlore | en_AU |
dc.subject | Electron microscopy | en_AU |
dc.subject | X-ray diffraction | en_AU |
dc.subject | Crystal structure | en_AU |
dc.subject | Argon | en_AU |
dc.title | Crystal chemistry and structures of (Ca,U) titanate pyrochlores | en_AU |
dc.type | Journal Article | en_AU |
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