Phase assemblage and microstructures of Gd2Ti2-xZrxO7 (x = 0.1–0.3) pyrochlore glass-ceramics as potential waste forms for actinide immobilization

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dc.contributor.authorBhuiyan, Aen_AU
dc.contributor.authorWong, Ven_AU
dc.contributor.authorAbraham, JLen_AU
dc.contributor.authorAughterson, RDen_AU
dc.contributor.authorKong, Len_AU
dc.contributor.authorFarzana, Ren_AU
dc.contributor.authorGregg, DJen_AU
dc.contributor.authorSorrell, CCen_AU
dc.contributor.authorZhang, YJen_AU
dc.contributor.authorKoshy, Pen_AU
dc.date.accessioned2025-01-13T00:20:24Zen_AU
dc.date.available2025-01-13T00:20:24Zen_AU
dc.date.issued2021-11-15en_AU
dc.date.statistics2024-10-23en_AU
dc.description.abstractGlass-ceramics (GCs) based on titanate pyrochlores have attracted recent attention as candidate waste forms for actinide immobilization. As zirconate pyrochlore has a superior radiation resistance, it is anticipated that Zr substitution of Ti in titanate pyrochlore GCs would increase their potential for waste form applications. The concept was primarily addressed via the preparation of Gd2Ti2-xZrxO7 (x = 0.1–0.3) GCs to determine the effects of sintering temperature, Zr substitution, and pyrochlore content (50–70 wt%) on the properties of the resultant GCs. XRD and SEM analyses were used to reveal the phase assemblages and microstructures while TEM and Raman spectroscopy were used to analyze the local structures. XRD results confirmed the formation of the targeted pyrochlore as the major phase, with Gd9.33(SiO4)6O2 oxyapatite present as a minor phase. SEM analyses revealed that up to 0.2 formula units of Ti could be substituted by Zr under the processing conditions. The pyrochlore crystallite sizes were largely controlled by the sintering temperature and cooling rate and showed little sensitivity to the glass contents. This work has demonstrated successful substitutions of Ti with Zr in Gd2Ti2O7 GCs as potential waste forms for actinide wastes owing to their superior radiation resistance. © 2021 Elsevier B.V.en_AU
dc.description.sponsorshipThis research was supported by the AINSE Honours scholarship program provided to the lead author and the research work was done at the Nuclear Science and Technology Landmark Infrastructures (NSTLI), Australian Nuclear Science and Technology Organisation (ANSTO) and the University of New South Wales (UNSW Sydney). The authors also thank the Mark Wainwright Analytical Centre for the subsidized use of facilities.en_AU
dc.identifier.articlenumber125058en_AU
dc.identifier.citationBhuiyan, A., Wong, V., Abraham, J. L., Aughterson, R. D., Kong, L., Farzana, R., Gregg, D. J., Sorrell, C. C., Zhang, Y., & Koshy, P. (2021). Phase assemblage and microstructures of Gd2Ti2-xZrxO7 (x = 0.1–0.3) pyrochlore glass-ceramics as potential waste forms for actinide immobilization. Materials Chemistry and Physics, 273, 125058. doi.org/10.1016/j.matchemphys.2021.125058en_AU
dc.identifier.issn0254-0584en_AU
dc.identifier.journaltitleMaterials Chemistry and Physicsen_AU
dc.identifier.urihttps://doi.org/10.1016/j.matchemphys.2021.125058en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15921en_AU
dc.identifier.volume273en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectCeramicsen_AU
dc.subjectWastesen_AU
dc.subjectActinidesen_AU
dc.subjectZirconiumen_AU
dc.subjectTitaniumen_AU
dc.subjectGadoliniumen_AU
dc.subjectTitanatesen_AU
dc.subjectPyrochloreen_AU
dc.subjectNuclear energyen_AU
dc.subjectRadioactive wastesen_AU
dc.subjectRadionuclide migrationen_AU
dc.subjectSynroc processen_AU
dc.subjectPyrochloreen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectSinteringen_AU
dc.titlePhase assemblage and microstructures of Gd2Ti2-xZrxO7 (x = 0.1–0.3) pyrochlore glass-ceramics as potential waste forms for actinide immobilizationen_AU
dc.typeJournal Articleen_AU
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