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http://hdl.handle.net/10773/19408
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DC Field | Value | Language |
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dc.contributor.author | Carvalho, Ricardo G. | pt |
dc.contributor.author | Kovalevsky, Andrei V. | pt |
dc.contributor.author | Lufaso, Michael W. | pt |
dc.contributor.author | Silva, Rui F. | pt |
dc.contributor.author | Costa, Florinda M. | pt |
dc.contributor.author | Figueiredo, Filipe M. | pt |
dc.date.accessioned | 2017-12-07T19:11:44Z | - |
dc.date.issued | 2014 | pt |
dc.identifier.issn | 0167-2738 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/19408 | - |
dc.description.abstract | The properties of directionally solidified eutectic (DSE) zirconia-mullite composites are presented. These materials combine two oxide ion conductors in eutectic microstructures stable over broad temperature (570-1415 degrees C) and PO2 (10(-20) to 10(5) Pa) ranges, which are pertinent for their application as high temperature (>1200 degrees C) solid electrolytes, e.g. in Nernstian sensors. X-ray diffraction and scanning electron microscopy/energy dispersive spectroscopy results reveal a composite structure comprising eutectic crystals of mullite and zirconia, and an intergranular amorphous phase rich in Al-Y-Si-O. The amorphous phase is crystallised upon annealing at 1400 degrees C, and the resulting composites have a composition close to the nominal eutectic consisting of 79 vol.% mullite and 21 vol.% zirconia. The electrical conductivity of these materials is rationalized in terms of percolation, fraction and properties of each phase, attaining values in excess of 0.01 S/cm at 1370 degrees C and displaying Arrhenius behaviour with activation energy of 70 kJ/mol. The broad electrolytic domain of these solid electrolytes is demonstrated by conductivity measurements carried out from 600 degrees C to 1370 degrees C in O2, air, Ar and 10%H-2 + 90%N-2 atmospheres. (C) 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/COMPETE/132936/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F64891%2F2009/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | ELECTRICAL-CONDUCTIVITY | pt |
dc.subject | STABILIZED ZIRCONIA | pt |
dc.subject | PHYSICAL-PROPERTIES | pt |
dc.subject | COMPOSITES | pt |
dc.subject | MICROSTRUCTURE | pt |
dc.subject | OXIDE | pt |
dc.subject | DIFFRACTION | pt |
dc.subject | FIBERS | pt |
dc.subject | SINGLE | pt |
dc.title | Ionic conductivity of directionally solidified zirconia-mullite eutectics | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 45 | pt |
degois.publication.lastPage | 51 | pt |
degois.publication.title | SOLID STATE IONICS | pt |
degois.publication.volume | 256 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1016/j.ssi.2013.12.033 | pt |
dc.identifier.doi | 10.1016/j.ssi.2013.12.033 | pt |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Ionic conductivity of directionally solidified zirconia-mullite eutectics_10.1016j.ssi.2013.12.033.pdf | 1.17 MB | Adobe PDF |
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