Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/9769
Title: Pyrochlore glass‐ceramics fabricated via both sintering and hot isostatic pressing for minor actinide immobilization
Authors: Zhang, Y
Zhang, Z
Wei, T
Kong, L
Kim, YJ
Gregg, DJ
Keywords: Pyrochlore
Glass
Ceramics
Hot pressing
Crystallization
Raman spectroscopy
Leaching
X-ray diffraction
Issue Date: 19-Mar-2020
Publisher: John Wiley & Sons, Inc.
Citation: Zhang, 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.17119
Abstract: Pyrochlore 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.
Gov't Doc #: 9988
URI: https://doi.org/10.1111/jace.17119
http://apo.ansto.gov.au/dspace/handle/10238/9769
ISSN: 0002-7820
Appears in Collections:Journal Articles

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