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dc.contributor.authorFabián, Martinpt_PT
dc.contributor.authorArias-Serrano, Blanca I.pt_PT
dc.contributor.authorYaremchenko, Alekseypt_PT
dc.contributor.authorKolev, Hristopt_PT
dc.contributor.authorKaňuchová, Máriapt_PT
dc.contributor.authorBriančin, Jaroslavpt_PT
dc.description.abstractThe 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.sponsorshipThis 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.relationCARBOSTEAM (POCI-01-0145-FEDER-032295)pt_PT
dc.subjectLanthanum aluminatept_PT
dc.subjectSolid electrolytept_PT
dc.titleIonic and electronic transport in calcium-substituted LaAlO3 perovskites prepared via mechanochemical routept_PT
dc.description.versionin publicationpt_PT
degois.publication.titleJournal of the European Ceramic Societypt_PT
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