Thermal conductivity variation in uranium dioxide with gadolinia additions

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dc.contributor.authorQin, MJen_AU
dc.contributor.authorMiddleburgh, SCen_AU
dc.contributor.authorCooper, MWDen_AU
dc.contributor.authorRushton, MJDen_AU
dc.contributor.authorPuide, Men_AU
dc.contributor.authorKuo, EYen_AU
dc.contributor.authorGrimes, RWen_AU
dc.contributor.authorLumpkin, GRen_AU
dc.date.accessioned2022-12-02T04:43:54Zen_AU
dc.date.available2022-12-02T04:43:54Zen_AU
dc.date.issued2020-11en_AU
dc.date.statistics2022-10-25en_AU
dc.description.abstractBy combining experimental observations on Gd doped fuel with a theoretical understanding, the variation in thermal conductivity with Gd concentration and accommodation mechanism has been modelled. Four types of Gd accommodation mechanisms have been studied. In UO2−x, isolated substitutional Gd3+ ions are compensated by oxygen vacancies and {2Gd'u:V"o}x defect clusters. In UO2, isolated substitutional Gd3+ ions are compensated by U5+ ions and {Gd'u:U'u}x defect clusters. The results indicate that defect clusters can be considered as less effective phonon scatterers and therefore result in less thermal conductivity degradation. The thermal conductivity predicted for UO2 with {Gd/u:U'u}x defect clusters is in good agreement with experimental data for UO2 with 5 wt% Gd2O3. This supports the previous theoretical results that Gd is accommodated through defect clusters {Gd'u:U'u}x in UO2 in the presence of excess oxygen. © 2020 Elsevier B.V.en_AU
dc.description.sponsorshipMJDR and SCM are supported by the Sêr Cymru II programme funded through the Welsh European Funding Office (WEFO) under the European Development Fund (ERDF)en_AU
dc.identifier.articlenumber152258en_AU
dc.identifier.citationQin, M. J., Middleburgh, S. C., Cooper, M. W. D., Rushton, M. J. D., Puide, M., Kuo, E. Y., Grimes, R. W. & Lumpkin, G. R. (2020). Thermal conductivity variation in uranium dioxide with gadolinia additions. Journal of Nuclear Materials, 540, 152258. doi:10.1016/j.jnucmat.2020.152258en_AU
dc.identifier.issn0022-3115en_AU
dc.identifier.journaltitleJournal of Nuclear Materialsen_AU
dc.identifier.urihttps://doi.org/10.1016/j.jnucmat.2020.152258en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14128en_AU
dc.identifier.volume540en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectUraniumen_AU
dc.subjectUranium dioxideen_AU
dc.subjectGadoliniumen_AU
dc.subjectRare earthsen_AU
dc.subjectThermal conductivityen_AU
dc.subjectSimulationen_AU
dc.titleThermal conductivity variation in uranium dioxide with gadolinia additionsen_AU
dc.typeJournal Articleen_AU
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