Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/20033
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DC Field | Value | Language |
---|---|---|
dc.contributor.author | Patrakeev, M. V. | pt |
dc.contributor.author | Markov, A. A. | pt |
dc.contributor.author | Shalaeva, E. V. | pt |
dc.contributor.author | Tyutyunnik, A. P. | pt |
dc.contributor.author | Tsipis, E. V. | pt |
dc.contributor.author | Waerenborgh, J. C. | pt |
dc.contributor.author | Kharton, V. V. | pt |
dc.contributor.author | Leonidov, I. A. | pt |
dc.contributor.author | Kozhevnikov, V. L. | pt |
dc.date.accessioned | 2017-12-07T19:33:12Z | - |
dc.date.issued | 2013 | pt |
dc.identifier.issn | 0167-2738 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/20033 | - |
dc.description.abstract | The electrical conductivity of SSrFe0.67Ta0.33O3 (-) (delta) measured in the oxygen partial pressure range from 10-2 to 0.5 atm at 700-950 degrees C, exhibits an anomalous and reversible increase in moderately reducing atmospheres, substantially contributed by oxygen ion transport. The coulometric titration studies in combination with the electron and X-ray diffraction analyses show that this trend correlates with the separation of oxygen-deficient disordered cubic perovskite and Ta-rich double perovskite domains of nanometer-scale size. Mossbauer spectroscopy demonstrated that the predominant state of iron cations in the vicinity of this transition is trivalent Further reduction leads to the formation of Fe2+ states responsible for increasing n-type electronic conductivity, whilst no traces of wustite or oxygen vacancy-ordered brownmillerite phases were detected. The ion conduction in partially reduced SrFe0.67Ta0.33O3 (-) (delta) is significantly higher compared to SrFe0.7Ta0.3O3 (-) (delta) and SrFe0.6Ta0.4O3 (-) (delta) under similar conditions, which may indicate an important role of the interfacial boundary enlarged due to the perovskite phase separation. 0 2013 Elsevier B.V. All rights reserved. | pt |
dc.language.iso | eng | pt |
dc.publisher | ELSEVIER SCIENCE BV | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876-PPCDTI/114561/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F28629%2F2006/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F88938%2F2012/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/COMPETE/132936/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | OXYGEN NONSTOICHIOMETRY | pt |
dc.subject | MOSSBAUER-SPECTROSCOPY | pt |
dc.subject | MIXED CONDUCTIVITY | pt |
dc.subject | PEROVSKITE | pt |
dc.subject | TEMPERATURE | pt |
dc.subject | TRANSPORT | pt |
dc.subject | OXIDATION | pt |
dc.subject | FERRITES | pt |
dc.subject | VALENCES | pt |
dc.subject | OXIDES | pt |
dc.title | Phase separation-promoted ion conduction in SrFe0.67Ta0.33O3 (-) (delta) ceramics | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 17 | pt |
degois.publication.lastPage | 22 | pt |
degois.publication.title | SOLID STATE IONICS | pt |
degois.publication.volume | 244 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1016/j.ssi.2013.05.001 | pt |
dc.identifier.doi | 10.1016/j.ssi.2013.05.001 | pt |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Phase separation-promoted ion conduction in SrFe0.67Ta0.33O3 (-) (delta) ceramics_10.1016j.ssi.2013.05.001.pdf | 513.3 kB | Adobe PDF |
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