Lanthanum pyrochlores and the effect of yttrium addition in the systems La2-xYxZr2O7 and La2-xYxHf2O7

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dc.contributor.authorWhittle, KRen_AU
dc.contributor.authorCranswick, LMDen_AU
dc.contributor.authorRedfern, SATen_AU
dc.contributor.authorSwainson, IPen_AU
dc.contributor.authorLumpkin, GRen_AU
dc.date.accessioned2010-04-09T01:54:36Zen_AU
dc.date.accessioned2010-04-30T05:09:28Zen_AU
dc.date.available2010-04-09T01:54:36Zen_AU
dc.date.available2010-04-30T05:09:28Zen_AU
dc.date.issued2009-03en_AU
dc.date.statistics2009-03en_AU
dc.description.abstractThe crystal structures of the compounds La2−xYxZr2O7 and La2−xYxHf2O7 with x=0.0, 0.4, 0.8, 1.2, 1.6, and 2.0 have been studied using neutron powder diffraction and electron microscopy to determine the stability fields of the pyrochlore and fluorite solid solutions. The limits of pyrochlore stability in these solid solutions are found to be close to La0.8Y1.2Zr2O7 and La0.4Y1.6Hf2O7, respectively. In both systems the unit cell parameter is found to vary linearly with Y content across those compositions where the pyrochlore phase is stable, as does the x-coordinate of the oxygen atoms on the 48f (x,3/8,3/8) sites. In both systems, linear extrapolations of the pyrochlore data suggest that the disordering is accompanied by a small decrease in the lattice parameter of approximately 0.4%. After the pyrochlore solid solution limit is reached, a sharp change is observed from x~0.41 to 0.375 as the disordered defect fluorite structure is favoured. Electron diffraction patterns illustrate that some short-range order remains in the disordered defect fluorite phases. © 2009, Elsevier Ltd.en_AU
dc.identifier.citationWhittle, K. R., Cranswick, L. M. D., Redfern, S. A. T., Swainson, I. P., & Lumpkin, G. R. (2009). Lanthanum pyrochlores and the effect of yttrium addition in the systems La2-xYxZr2O7 and La2-xYxHf2O7. Journal of Solid State Chemistry, 182(3), 442-450. doi:10.1016/j.jssc.2008.11.008en_AU
dc.identifier.govdoc1610en_AU
dc.identifier.issn0022-4596en_AU
dc.identifier.issue3en_AU
dc.identifier.journaltitleJournal of Solid State Chemistryen_AU
dc.identifier.pagination442-450en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jssc.2008.11.008en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3135en_AU
dc.identifier.volume182en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectCrystal structureen_AU
dc.subjectPyrochloreen_AU
dc.subjectFluoriteen_AU
dc.subjectLanthanumen_AU
dc.subjectYttriumen_AU
dc.subjectDiffractionen_AU
dc.titleLanthanum pyrochlores and the effect of yttrium addition in the systems La2-xYxZr2O7 and La2-xYxHf2O7en_AU
dc.typeJournal Articleen_AU
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