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http://hdl.handle.net/10773/26439
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DC Field | Value | Language |
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dc.contributor.author | Fabián, Martin | pt_PT |
dc.contributor.author | Arias-Serrano, Blanca I. | pt_PT |
dc.contributor.author | Yaremchenko, Aleksey | pt_PT |
dc.contributor.author | Kolev, Hristo | pt_PT |
dc.contributor.author | Kaňuchová, Mária | pt_PT |
dc.contributor.author | Briančin, Jaroslav | pt_PT |
dc.date.accessioned | 2019-08-27T15:37:06Z | - |
dc.date.issued | 2019 | - |
dc.identifier.issn | 0955-2219 | pt_PT |
dc.identifier.uri | http://hdl.handle.net/10773/26439 | - |
dc.description.abstract | The present work explores mechanosynthesis of lanthanum aluminate-based perovskite ceramics and corresponding effects on ionic-electronic transport properties. La1-xCaxAlO3-δ (x = 0.05-0.20) nanopowders were prepared via one-step high-energy mechanochemical processing. Sintering at 1450°C yielded dense ceramics with submicron grains. As-prepared powders and sintered ceramics were characterized by XRPD, XPS and SEM. Electrochemical studies showed that partial oxygen-ionic conductivity in prepared La1-xCaxAlO3-δ increases with calcium content up to 10 at.% in the lanthanum sublattice and then levels off at ~6×10-3 S/cm at 900°C. La1-xCaxAlO3-δ ceramics are mixed conductors under oxidizing conditions and ionic conductors with negligible contribution of electronic transport in reducing atmospheres. Oxygen-ionic contribution to the total conductivity is 20-68% at 900°C in air and increases with Ca content, with temperature and with reducing p(O2). Impedance spectroscopy results showed however that electrical properties of mechanosynthesized La1-xCaxAlO3-δ ceramics below ~800°C are determined by prevailing grain boundary contribution to the total resistivity. | pt_PT |
dc.description.sponsorship | This work was supported by the Slovak Research and Development Agency APVV (contracts SK-PT-18-0039 and 15-0438) and the Slovak Grand Agency (contract No. 2/0055/19). BIAS and AAY would like to acknowledge financial support by the FCT, Portugal (bilateral project Portugal-Slovakia 2019-2020, project CARBOSTEAM (POCI01-0145-FEDER-032295) and project CICECO-Aveiro Institute of Materials (FCT ref. UID/CTM/50011/2019), financed by national funds through the FCT/MCTES and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement). HK thanks to SAIA, n.o. for financial support within National Scholarship Programme of the Slovak republic (NSP). | pt_PT |
dc.language.iso | eng | pt_PT |
dc.publisher | Elsevier | pt_PT |
dc.relation | CARBOSTEAM (POCI-01-0145-FEDER-032295) | pt_PT |
dc.relation | UID/CTM/50011/2019 | pt_PT |
dc.rights | openAccess | pt_PT |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | pt_PT |
dc.subject | Lanthanum aluminate | pt_PT |
dc.subject | Mechanosynthesis | pt_PT |
dc.subject | Perovskite | pt_PT |
dc.subject | Conductivity | pt_PT |
dc.subject | Solid electrolyte | pt_PT |
dc.title | Ionic and electronic transport in calcium-substituted LaAlO3 perovskites prepared via mechanochemical route | pt_PT |
dc.type | article | pt_PT |
dc.description.version | in publication | pt_PT |
dc.peerreviewed | yes | pt_PT |
degois.publication.title | Journal of the European Ceramic Society | pt_PT |
dc.date.embargo | 2020-07-23 | - |
dc.identifier.doi | 10.1016/j.jeurceramsoc.2019.07.038 | pt_PT |
Appears in Collections: | CICECO - Artigos DEMaC - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Ionic and electronic transport in calcium-substituted.pdf | 1.92 MB | Adobe PDF | View/Open |
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