Insight into the order-disorder transition of irradiated pyrochlore solid solutions as potential nuclear waste forms

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dc.contributor.authorChang, Sen_AU
dc.contributor.authorThorogood, GJen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorBrandt, Fen_AU
dc.contributor.authorBosbach, Den_AU
dc.contributor.authorIonescu, Men_AU
dc.contributor.authorSimeone, Den_AU
dc.contributor.authorFinkeldei, SCen_AU
dc.date.accessioned2022-05-05T01:11:51Zen_AU
dc.date.available2022-05-05T01:11:51Zen_AU
dc.date.issued2021-07-07en_AU
dc.date.statistics2022-03-24en_AU
dc.description.abstractPyrochlores (A2B2O7), a common mineral that can uptake large quantities of actinides, are studied as potential nuclear waste forms to immobilize radionuclides. Many have studied pyrochlore solid solutions where different cations on the A or B site are mixed to imitate waste loading of e.g. Pu within the pyrochlore structure. As a response to irradiation or self-irradiation, zirconate (B=Zr) pyrochlores are known to undergo an order/disorder phase transition into a disordered defect fluorite structure while titanate (B=Ti) pyrochlores become amorphous, however the dominating factor towards phase transition of each is unclear in a solid solution. To gain insight into order-disorder processes, the stress and strain of Nd2Zr2O7 and Er2Ti2O7 endmembers and a (ErNd)2(TiZr)2O7 solid solution were examined. Prior and upon irradiation Nd2Zr2O7 and Er2Ti2O7 both showed no strain. With regards to (ErNd)2(TiZr)2O7, it appears that the synthesis method employed was not sufficient to achieve a 50:50 ratio of A and B cations according to the diffraction results. However, the solid solution contained strain while Nd2Zr2O7 and Er2Ti2O7 was strain free. Further synthesis approaches of (ErNd)2(TiZr)2O7 solid solution members are under way to understand the irradiation response of such mixed A and B site pyrochlores.en_AU
dc.identifier.citationChang, S., Thorogood, G. J., Avdeev, M., Brandt, F., Bosbach, D., Ionescu, M., Simeone, D. & Finkeldei, S. C. (2021). Insight into the order-disorder transition of irradiated pyrochlore solid solutions as potential nuclear waste forms. Paper presented at Goldschmidt 2021 Virtual, 4-9 July 2021. Retrieved from: https://2021.goldschmidt.info/goldschmidt/2021/meetingapp.cgi/Paper/8040en_AU
dc.identifier.conferenceenddate9 July 2021en_AU
dc.identifier.conferencenameGoldschmidt 2021en_AU
dc.identifier.conferenceplaceVirtualen_AU
dc.identifier.conferencestartdate4 July 2021en_AU
dc.identifier.urihttps://2021.goldschmidt.info/goldschmidt/2021/meetingapp.cgi/Paper/8040en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13105en_AU
dc.language.isoenen_AU
dc.publisherEuropean Association of Geochemistry and the Geochemical Society (Goldschmidt)en_AU
dc.subjectPyrochloreen_AU
dc.subjectRadioactive wastesen_AU
dc.subjectRadionuclidesen_AU
dc.subjectOrder-disorder transformationsen_AU
dc.subjectFluoriteen_AU
dc.subjectStressesen_AU
dc.subjectNeutron diffractionen_AU
dc.titleInsight into the order-disorder transition of irradiated pyrochlore solid solutions as potential nuclear waste formsen_AU
dc.typeConference Presentationen_AU
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