Pyrochlore glass‐ceramics fabricated via both sintering and hot isostatic pressing for minor actinide immobilization

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dc.contributor.authorZhang, YJen_AU
dc.contributor.authorZhang, ZMen_AU
dc.contributor.authorWei, Ten_AU
dc.contributor.authorKong, Len_AU
dc.contributor.authorKim, YJen_AU
dc.contributor.authorGregg, DJen_AU
dc.date.accessioned2020-09-03T00:48:31Zen_AU
dc.date.available2020-09-03T00:48:31Zen_AU
dc.date.issued2020-03-19en_AU
dc.date.statistics2020-09-01en_AU
dc.description.abstractPyrochlore glass‐ceramics (GCs) have been investigated with samples fabricated via both sintering and hot isostatic pressing (HIPing) of a mixed oxide precursor. It has been demonstrated that sintering at 1200°C in air is necessary to obtain well‐crystallized pyrochlore crystals in a sodium aluminoborosilicate glass through a one‐step controlled cooling. The crystallization, structure, and microstructure of Eu2Ti2O7 pyrochlore as the major phases in residual glass were confirmed with X‐ray diffraction (XRD), scanning electron microscopy‐energy dispersive spectroscopy, transmission electron microscopy, and Raman spectroscopy. The structures of major Eu2Ti2O7 pyrochlore and minor [Eu4.67O(SiO4)3] apatite in both sintered and HIPed samples were refined using synchrotron XRD data. While the processing atmosphere did not appear to affect the cell parameter of the main pyrochlore phase, very small volume expansion (~0.3%) was observed for the minor apatite phase in the HIPed sample. In addition, static leaching of the HIPed sample confirmed that pyrochlore GCs are chemically durable. Overall, pyrochlore GCs prepared via both sintering and HIPing with the Eu partitioning factor of ~23 between ceramics and the residual glass are suitable waste forms for minor actinides with processing chemicals. © 1999-2020 John Wiley & Sons, Inc.en_AU
dc.identifier.citationZhang, Y., Zhang, Z., Wei, T., Kong, L., Kim, Y. J., & Gregg, D. J. (2020). Pyrochlore glass-ceramics fabricated via both sintering and hot isostatic pressing for minor actinide immobilization. Journal of the American Ceramic Society, 103(10), 5470-5479. doi:10.1111/jace.17119en_AU
dc.identifier.govdoc9988en_AU
dc.identifier.issn0002-7820en_AU
dc.identifier.issue10en_AU
dc.identifier.journaltitleJournal of the American Ceramic Societyen_AU
dc.identifier.pagination5470-5479en_AU
dc.identifier.urihttps://doi.org/10.1111/jace.17119en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9769en_AU
dc.identifier.volume103en_AU
dc.language.isoenen_AU
dc.publisherJohn Wiley & Sons, Inc.en_AU
dc.subjectPyrochloreen_AU
dc.subjectGlassen_AU
dc.subjectCeramicsen_AU
dc.subjectHot pressingen_AU
dc.subjectCrystallizationen_AU
dc.subjectRaman spectroscopyen_AU
dc.subjectLeachingen_AU
dc.subjectX-ray diffractionen_AU
dc.titlePyrochlore glass‐ceramics fabricated via both sintering and hot isostatic pressing for minor actinide immobilizationen_AU
dc.typeJournal Articleen_AU
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