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http://hdl.handle.net/10773/19568
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DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ling, Chris D. | pt |
dc.contributor.author | Schmid, Siegbert | pt |
dc.contributor.author | Blanchard, Peter E. R. | pt |
dc.contributor.author | Petricek, Vaclav | pt |
dc.contributor.author | McIntyre, Garry J. | pt |
dc.contributor.author | Sharma, Neeraj | pt |
dc.contributor.author | Maljuk, Andrey | pt |
dc.contributor.author | Yaremchenko, Aleksey A. | pt |
dc.contributor.author | Kharton, Vladislav V. | pt |
dc.contributor.author | Gutmann, Matthias | pt |
dc.contributor.author | Withers, Ray L. | pt |
dc.date.accessioned | 2017-12-07T19:17:08Z | - |
dc.date.issued | 2013 | pt |
dc.identifier.issn | 0002-7863 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/19568 | - |
dc.description.abstract | The high-temperature cubic form of bismuth oxide, delta-Bi2O3, is the best intermediate-temperature oxide-ionic conductor known. The most elegant way of stabilizing delta-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 delta-Bi2O3-like channels, explaining the high oxide-ionic conductivity compared to commensurately modulated phases in the same pseudobinary system. | pt |
dc.language.iso | eng | pt |
dc.publisher | AMER CHEMICAL SOC | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/COMPETE/132936/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | 3-DIMENSIONAL INCOMMENSURATE MODULATION | pt |
dc.subject | NEUTRON POWDER DIFFRACTION | pt |
dc.subject | SOLID-SOLUTION | pt |
dc.subject | FUEL-CELLS | pt |
dc.subject | STRUCTURAL-PROPERTIES | pt |
dc.subject | BISMUTH SESQUIOXIDE | pt |
dc.subject | SUPERSPACE GROUPS | pt |
dc.subject | NODAL SURFACES | pt |
dc.subject | SYSTEM | pt |
dc.subject | PHASE | pt |
dc.title | A (3+3)-Dimensional \"Hypercubic\" Oxide-Ionic Conductor: Type II Bi2O3-Nb2O5 | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 6477 | pt |
degois.publication.issue | 17 | pt |
degois.publication.lastPage | 6484 | pt |
degois.publication.title | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | pt |
degois.publication.volume | 135 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1021/ja3109328 | pt |
dc.identifier.doi | 10.1021/ja3109328 | pt |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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A (3+3)-Dimensional Hypercubic Oxide-Ionic Conductor Type II Bi2O3-Nb2O5_10.1021ja3109328.pdf | 463.89 kB | Adobe PDF |
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