Disordered structures and low temperature dielectric relaxation properties of two misplaced-displacive cubic pyrochlores found in the Bi2O3–MIIO–Nb2O5 (M=Mg, Ni) systems

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dc.contributor.authorNguyen, HBen_AU
dc.contributor.authorNorén, Len_AU
dc.contributor.authorLiu, Yen_AU
dc.contributor.authorWithers, RLen_AU
dc.contributor.authorWei, XYen_AU
dc.contributor.authorElcombe, MMen_AU
dc.date.accessioned2008-04-28T03:58:23Zen_AU
dc.date.accessioned2010-04-30T05:03:01Zen_AU
dc.date.available2008-04-28T03:58:23Zen_AU
dc.date.available2010-04-30T05:03:01Zen_AU
dc.date.issued2007-09en_AU
dc.date.statistics2007-09en_AU
dc.description.abstractThe disordered structures and low temperature dielectric relaxation properties of Bi1.667Mg0.70Nb1.52O7 (BMN) and Bi1.67Ni0.75Nb1.50O7 (BNN) misplaced-displacive cubic pyrochlores found in the Bi2O3–MIIO–Nb2O5 (M=Mg, Ni) systems are reported. As for other recently reported Bi-pyrochlores, the metal ion vacancies are found to be confined to the pyrochlore A site. The B2O6 octahedral sub-structure is found to be fully occupied and well-ordered. Considerable displacive disorder, however, is found associated with the O' A2 tetrahedral sub-structure in both cases. The A-site ions were displaced from Wyckoff position 16d (1/2, 1/2, 1/2) to 96 h (1/2, 1/2-éA, 1/2 + éA while the O' oxygen was shifted from position 8b (3/8, 3/8, 3/8) to Wyckoff position 32e (3/8 + éọ, 3/8 + éọ, 3/8 + éọ). The refined displacement magnitudes off the 16d and 8b sites for the A and O' sites were 0.408 Å/0.423 Å and 0.350 Å/0.369 Å for BMN/BNN, respectively. © 2007, Elsevier Ltd.en_AU
dc.identifier.citationNguyen, H. B., Norén, L., Liu, Y., Withers, R. L., Wei, X. Y., & Elcombe, M. M. (2007). Disordered structures and low temperature dielectric relaxation properties of two misplaced-displacive cubic pyrochlores found in the Bi2O3–MIIO–Nb2O5 (M=Mg, Ni) systems. Journal of Solid State Chemistry, 180(9), 2558-2565. doi:10.1016/j.jssc.2007.07.003en_AU
dc.identifier.govdoc1193en_AU
dc.identifier.issn0022-4596en_AU
dc.identifier.issue9en_AU
dc.identifier.journaltitleJournal of Solid State Chemistryen_AU
dc.identifier.pagination2558-2565en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jssc.2007.07.003en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1129en_AU
dc.identifier.volume180en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectPyrochloreen_AU
dc.subjectRelaxationen_AU
dc.subjectTemperature range 0065-0273 Ken_AU
dc.subjectOrder-disorder modelen_AU
dc.subjectIonsen_AU
dc.subjectOxygenen_AU
dc.titleDisordered structures and low temperature dielectric relaxation properties of two misplaced-displacive cubic pyrochlores found in the Bi2O3–MIIO–Nb2O5 (M=Mg, Ni) systemsen_AU
dc.typeJournal Articleen_AU
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