Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/20551
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Sherafat, Z. | pt |
dc.contributor.author | Antunes, I. | pt |
dc.contributor.author | Almeida, C. | pt |
dc.contributor.author | Frade, J. R. | pt |
dc.contributor.author | Paydar, M. H. | pt |
dc.contributor.author | Mather, G. C. | pt |
dc.contributor.author | Fagg, D. P. | pt |
dc.date.accessioned | 2017-12-07T19:51:08Z | - |
dc.date.issued | 2014 | pt |
dc.identifier.issn | 1477-9226 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/20551 | - |
dc.description.abstract | The current work assesses the impact of structural differences between stable and metastable ZrO2 precursors on the mechanochemical preparation of BaZrO3. Monoclinic (m-ZrO2) and tetragonal (t-ZrO2) zirconia polymorphs were prepared without stabilizing additives by slow alkaline precipitation. High-energy milling of the individual ZrO2 precursors induced different partial transformations in each case. The as-synthesized m-ZrO2 powders showed partial conversion to the tetragonal polymorph on mechanical activation, reaching about 10% t-ZrO2 after 420 min accompanied by increases in strain. In contrast, the as synthesized t-ZrO2 powders underwent the inverse transformation to the monoclinic phase, producing about 50% m-ZrO2 after 120 min with the liberation of strain. The t-ZrO2 precursor was shown to exhibit the higher reactivity with barium peroxide, yielding significantly earlier formation of barium zirconate under room-temperature mechanosynthesis. The progress of the mechanochemical formation of BaZrO3 has been discussed with respect to the differing behaviour of the ZrO2 precursors upon mechanical activation and associated thermodynamic perspectives. | pt |
dc.language.iso | eng | pt |
dc.publisher | ROYAL SOC CHEMISTRY | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876-PPCDTI/100412/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/5876-PPCDTI/105424/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F76738%2F2011/PT | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/COMPETE/132936/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | DOPED BARIUM ZIRCONATE | pt |
dc.subject | THERMAL-DECOMPOSITION | pt |
dc.subject | STEAM ELECTROLYSIS | pt |
dc.subject | MECHANOCHEMICAL SYNTHESIS | pt |
dc.subject | MICROSTRUCTURAL CHANGES | pt |
dc.subject | PHASE-TRANSFORMATIONS | pt |
dc.subject | MECHANICAL ACTIVATION | pt |
dc.subject | PROTON CONDUCTIVITY | pt |
dc.subject | HYDROGEN-PRODUCTION | pt |
dc.subject | CRYSTALLITE SIZE | pt |
dc.title | Enhanced BaZrO3 mechanosynthesis by the use of metastable ZrO2 precursors | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 9324 | pt |
degois.publication.issue | 24 | pt |
degois.publication.lastPage | 9333 | pt |
degois.publication.title | DALTON TRANSACTIONS | pt |
degois.publication.volume | 43 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1039/c4dt00683f | pt |
dc.identifier.doi | 10.1039/c4dt00683f | pt |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Enhanced BaZrO3 mechanosynthesis by the use of metastable ZrO2 precursors_10.1039c4dt00683f.pdf | 1.07 MB | Adobe PDF |
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