Ion irradiation of ternary pyrochlore oxides

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dc.contributor.authorLumpkin, GRen_AU
dc.contributor.authorSmith, KLen_AU
dc.contributor.authorBlackford, MGen_AU
dc.contributor.authorWhittle, KRen_AU
dc.contributor.authorHarvey, EJen_AU
dc.contributor.authorRedfern, SATen_AU
dc.contributor.authorZaluzec, NJen_AU
dc.date.accessioned2010-04-07T03:38:58Zen_AU
dc.date.accessioned2010-04-30T05:09:19Zen_AU
dc.date.available2010-04-07T03:38:58Zen_AU
dc.date.available2010-04-30T05:09:19Zen_AU
dc.date.issued2009-07-14en_AU
dc.date.statistics2009-07-14en_AU
dc.description.abstractPolycrystalline synthetic samples of Y2Ti2−xSnxO7 with x = 0.4, 0.8, 1.2, and 1.6, together with Nd2Zr2O7, Nd2Zr1.2Ti0.8O7, and La1.6Y0.4Hf2O7, were irradiated in situ in the intermediate voltage electron microscope (IVEM)-Tandem Facility at Argonne National Laboratory using 1.0 MeV Kr ions at temperatures of 50 to 650 K. Determination of the critical amorphization fluence (Fc) as a function of temperature has revealed a dramatic increase in radiation tolerance with increasing Sn content on the pyrochlore B site. Nonlinear least-squares analysis of the fluence-temperature curves gave critical temperatures (Tc) of 666 ± 4, 335 ± 12, and 251 ± 51 K for the Y2Ti2−xSnxO7 samples with x = 0.4, 0.8, and 1.2, respectively. The sample with x = 1.6 appears to disorder to a defect fluorite structure at a fluence below 1.25 × 1015 ions cm−2 and remains crystalline to 5 × 1015 ions cm−2 at 50 K. Additionally, the critical fluence-temperature response curves were determined for Nd2Zr1.2Ti0.8O7 and La1.6Y0.4Hf2O7, and we obtained Tc values of 685 ± 53 K and 473 ± 52 K, respectively, for these pyrochlores. Nd2Zr2O7 did not become amorphous after a fluence of 2.5 × 1015 ions cm−2 at 50 K, but there is evidence that it may amorphize at a higher fluence, with an estimated Tc of 135 K. The observed Tc results are discussed with respect to the predicted Tc values based upon a previously published empirical model (Lumpkin, G. R.; Pruneda, M.; Rios, S.; Smith, K. L.; Trachenko, K.; Whittle, K. R.; Zaluzec, N. J. J. Solid State Chem. 2007, 180, 1512). In the Y2Ti2−xSnxO7 pyrochlores, Tc appears to be linear with respect to composition, and is linear with respect to rA/rB and x(48f) for all samples investigated herein. © 2009, American Chemical Societyen_AU
dc.identifier.citationLumpkin, G. R., Smith, K. L., Blackford, M. G., Whittle, K. R., Harvey, E. J., Redfern, S. A. T., & Zaluzec, N. J. (2009). Ion irradiation of ternary pyrochlore oxides. Chemistry of Materials, 21(13), 2746-2754. doi:10.1021/cm9003917en_AU
dc.identifier.govdoc1600en_AU
dc.identifier.issn0897-4756en_AU
dc.identifier.issue13en_AU
dc.identifier.journaltitleChemistry of Materialsen_AU
dc.identifier.pagination2746-2754en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/cm9003917en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3080en_AU
dc.identifier.volume21en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectPyrochloreen_AU
dc.subjectIrradiationen_AU
dc.subjectElectron microscopyen_AU
dc.subjectANLen_AU
dc.subjectToleranceen_AU
dc.subjectTemperature rangeen_AU
dc.titleIon irradiation of ternary pyrochlore oxidesen_AU
dc.typeJournal Articleen_AU
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