Ion-irradiation resistance of the orthorhombic Ln2TiO5 (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb and Dy) series

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dc.contributor.authorAughterson, RDen_AU
dc.contributor.authorLumpkin, GRen_AU
dc.contributor.authorIonescu, Men_AU
dc.contributor.authorde los Reyes, Men_AU
dc.contributor.authorGault, Ben_AU
dc.contributor.authorWhittle, KRen_AU
dc.contributor.authorSmith, KLen_AU
dc.contributor.authorCairney, JMen_AU
dc.date.accessioned2017-04-10T06:49:49Zen_AU
dc.date.available2017-04-10T06:49:49Zen_AU
dc.date.issued2015-12-01en_AU
dc.date.statistics2017-04-10en_AU
dc.description.abstractThe response of Ln2TiO5 (where Ln is a lanthanide) compounds exposed to high-energy ions was used to test their suitability for nuclear-based applications, under two different but complementary conditions. Eight samples with nominal stoichiometry Ln2TiO5 (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb and Dy), of orthorhombic (Pnma) structure were irradiated, at various temperatures, with 1 MeV Kr2+ ions in-situ within a transmission electron microscope. In each case, the fluence was increased until a phase transition from crystalline to amorphous was observed, termed critical dose Dc. At certain elevated temperatures, the crystallinity was maintained irrespective of fluence. The critical temperature for maintaining crystallinity, Tc, varied non-uniformly across the series. The Tc was consistently high for La, Pr, Nd and Sm2TiO5 before sequential improvement from Eu to Dy2TiO5 with Tc's dropping from 974 K to 712 K. In addition, bulk Dy2TiO5 was irradiated with 12 MeV Au+ ions at 300 K, 723 K and 823 K and monitored via grazing-incidence X-ray diffraction (GIXRD). At 300 K, only amorphisation is observed, with no transition to other structures, whilst at higher temperatures, specimens retained their original structure. The improved radiation tolerance of compounds containing smaller lanthanides has previously been attributed to their ability to form radiation-induced phase transitions. No such transitions were observed here. © 2017 Elsevier B.V.en_AU
dc.identifier.citationAughterson, R. D., Lumpkin, G., R., Ionescu, M., de los Reyes, M., Gault, B., Whittle, K. R., Smith, K. L., & Cairney, J. M. (2015). Ion-irradiation resistance of the orthorhombic Ln2TiO5 (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb and Dy) series. Journal of Nuclear Materials, 467, 683-691. doi:10.1016/j.jnucmat.2015.10.028en_AU
dc.identifier.govdoc8087en_AU
dc.identifier.issn0022-3115en_AU
dc.identifier.journaltitleJournal of Nuclear Materialsen_AU
dc.identifier.pagination683-691en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jnucmat.2015.10.028en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/8542en_AU
dc.identifier.volume467en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectX-ray diffractionen_AU
dc.subjectIrradiationen_AU
dc.subjectStoichiometryen_AU
dc.subjectRare earthsen_AU
dc.subjectOrthorhombic latticesen_AU
dc.subjectElectron microscopyen_AU
dc.subjectAmorphous stateen_AU
dc.subjectCrystallizationen_AU
dc.subjectPhase transformationsen_AU
dc.titleIon-irradiation resistance of the orthorhombic Ln2TiO5 (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb and Dy) seriesen_AU
dc.typeJournal Articleen_AU
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