A (3 + 3)-dimensional “hypercubic” oxide-ionic conductor: type ii bi2o3–nb2o5

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dc.contributor.authorLing, CDen_AU
dc.contributor.authorSchmid, Sen_AU
dc.contributor.authorBlanchard, PERen_AU
dc.contributor.authorPetříček, Ven_AU
dc.contributor.authorMcIntyre, GJen_AU
dc.contributor.authorSharma, Nen_AU
dc.contributor.authorMaljuk, Aen_AU
dc.contributor.authorYaremchenko, AAen_AU
dc.contributor.authorKharton, VVen_AU
dc.contributor.authorGutmann, MJen_AU
dc.contributor.authorWithers, RLen_AU
dc.date.accessioned2014-10-01T04:07:40Zen_AU
dc.date.available2014-10-01T04:07:40Zen_AU
dc.date.issued2013-04-09en_AU
dc.date.statistics2014-10-01en_AU
dc.description.abstractThe high-temperature cubic form of bismuth oxide, δ-Bi2O3, is the best intermediate-temperature oxide-ionic conductor known. The most elegant way of stabilizing δ-Bi2O3 to room temperature, while preserving a large part of its conductivity, is by doping with higher valent transition metals to create wide solid-solutions fields with exceedingly rare and complex (3 + 3)-dimensional incommensurately modulated ?hypercubic? structures. These materials remain poorly understood because no such structure has ever been quantitatively solved and refined, due to both the complexity of the problem and a lack of adequate experimental data. We have addressed this by growing a large (centimeter scale) crystal using a novel refluxing floating-zone method, collecting high-quality single-crystal neutron diffraction data, and treating its structure together with X-ray diffraction data within the superspace symmetry formalism. The structure can be understood as an ?inflated? pyrochlore, in which corner-connected NbO6 octahedral chains move smoothly apart to accommodate the solid solution. While some oxide vacancies are ordered into these chains, the rest are distributed throughout a continuous three-dimensional network of wide δ-Bi2O3-like channels, explaining the high oxide-ionic conductivity compared to commensurately modulated phases in the same pseudobinary system. © 2013, American Chemical Society.en_AU
dc.identifier.citationLing, C.D., Schmid, S., Blanchard, P.E.R., Petříček, V., McIntyre, G.J., Sharma, N., Maljuk, A., Yaremchenko, A.A., Kharton, V.V., Gutmann, M., & Withers, R.L. (2013). A (3 + 3)-dimensional “hypercubic” oxide-ionic conductor: type ii bi2o3–nb2o5. Journal of the American Chemical Society, 135(17), 6477-6484. doi:10.1021/ja3109328en_AU
dc.identifier.govdoc5150en_AU
dc.identifier.issn0002-7863en_AU
dc.identifier.issue17en_AU
dc.identifier.journaltitleJournal of the American Chemical Societyen_AU
dc.identifier.pagination6477-6484en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/ja3109328en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5882en_AU
dc.identifier.volume135en_AU
dc.language.isoenen_AU
dc.publisherACS Publicationsen_AU
dc.subjectBismuth oxidesen_AU
dc.subjectThermal conductivityen_AU
dc.subjectTransition elementsen_AU
dc.subjectCrystalsen_AU
dc.subjectZone meltingen_AU
dc.subjectDiffractionen_AU
dc.titleA (3 + 3)-dimensional “hypercubic” oxide-ionic conductor: type ii bi2o3–nb2o5en_AU
dc.typeJournal Articleen_AU
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