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http://hdl.handle.net/10773/20021
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DC Field | Value | Language |
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dc.contributor.author | Kovalevsky, A. V. | pt |
dc.contributor.author | Populoh, S. | pt |
dc.contributor.author | Patricio, S. G. | pt |
dc.contributor.author | Thiel, P. | pt |
dc.contributor.author | Ferro, M. C. | pt |
dc.contributor.author | Fagg, D. P. | pt |
dc.contributor.author | Frade, J. R. | pt |
dc.contributor.author | Weidenkaff, A. | pt |
dc.date.accessioned | 2017-12-07T19:32:48Z | - |
dc.date.issued | 2015 | pt |
dc.identifier.issn | 1932-7447 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/20021 | - |
dc.description.abstract | Among n-type oxide thermoelectrics, donor-substituted strontium titanates, prepared in highly reducing conditions, show a particularly attractive thermoelectric figure of merit. High electrical conductivity, combined with outstanding redox tolerance and perovskite-phase stability of these materials, also make them prospective candidates for solid oxide fuel cell (SOFC) anode components. This work represents a first attempt to process strontium titanate ceramics with significant W for Ti substitution and to assess their relevant defect chemistry-related aspects and electrical and thermal properties, seeking mainly highly performing oxide thermoelectrics. Combined XRD/XPS/SEM/EDS studies of SrTi1-xWxO3 +/-delta (x = 0.01-0.10), prepared by a conventional solid state route, demonstrated that the maximum solubility of tungsten corresponds to 3-5% mol, depending on firing conditions and other composition changes. Separation of tungsten-containing phases on a submicro- and nanoscale level and formation of core-shell microstructures were confirmed for x >= 0.06, suggesting possibilities for tuning the thermal and electrical conductivities. Titanium cations are substituted predominantly by W6+ and partially by W5+ . High electrical conductivity and the Seebeck coefficient resulted in a maximum power factor of similar to 0.5 mW x m(-1) x K-2 for SrTi0.99W0.01O3 +/-delta; maximum ZT values, observed in the case of x = 0.01-0.06, amounted to 0.18-0.24 at 1173-1273 K. Co-substitution in Sr(Ti,Nb,W)TiO3 +/-delta materials showed good prospects for boosting thermoelectric performance in titanates, predominantly by significant reduction of the thermal conductivity. | pt |
dc.language.iso | eng | pt |
dc.publisher | AMER CHEMICAL SOC | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876/147332/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/COMPETE/132936/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F75943%2F2011/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | NB-DOPED SRTIO3 | pt |
dc.subject | STRONTIUM-TITANATE | pt |
dc.subject | HIGH-TEMPERATURE | pt |
dc.subject | FERROELECTRIC CERAMICS | pt |
dc.subject | ELECTRICAL-PROPERTIES | pt |
dc.subject | TRANSPORT-PROPERTIES | pt |
dc.subject | FUEL-CELLS | pt |
dc.subject | CONDUCTIVITY | pt |
dc.subject | PERFORMANCE | pt |
dc.subject | DEFECT | pt |
dc.title | Design of SrTiO3-Based Thermoelectrics by Tungsten Substitution | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 4466 | pt |
degois.publication.issue | 9 | pt |
degois.publication.lastPage | 4478 | pt |
degois.publication.title | JOURNAL OF PHYSICAL CHEMISTRY C | pt |
degois.publication.volume | 119 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1021/jp510743h | pt |
dc.identifier.doi | 10.1021/jp510743h | pt |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Design of SrTiO3-Based Thermoelectrics by Tungsten Substitution_10.1021jp510743h.pdf | 7.36 MB | Adobe PDF |
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