Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/39401
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dc.contributor.authorFabián, Martinpt_PT
dc.contributor.authorArias-Serrano, Blanca I.pt_PT
dc.contributor.authorBriančin, Jaroslavpt_PT
dc.contributor.authorYaremchenko, Alekseypt_PT
dc.date.accessioned2023-09-14T16:17:16Z-
dc.date.issued2023-11-25-
dc.identifier.issn0925-8388pt_PT
dc.identifier.urihttp://hdl.handle.net/10773/39401-
dc.description.abstractGadolinium aluminate (GdAlO3) and its calcium-substituted derivates (Gd1-xCaxAlO3-δ; x = 0.05, 0.10 and 0.15) are prepared via one-step mechanochemical processing of simple oxide precursors at ambient temperature. The mechanochemical reaction is accompanied by Gd2O3 phase transformation. The as-prepared and sintered materials are characterized by X-ray diffraction and scanning electron microscopy. Sintering at 1450°C resulted in relatively porous ceramics (with density <90% of theoretical value) except Gd0.85Ca0.15AlO3-δ. The electrical conductivity of the sintered samples was investigated by impedance spectroscopy at 350-1000°C in air. Undoped GdAlO3 ceramics exhibit low conductivity, ~10-6 S/cm at 800°C. Acceptor-type substitution of 5 at.% of gadolinium by calcium results in ~3 orders of magnitude increase in both total and bulk conductivity associated with a substantial enhancement in oxygen-ionic transport. Further doping has a limited effect on the electrical transport properties, and electrical conductivity remains nearly composition-independent in the range x = 0.05-0.15. Grain boundaries are demonstrated to have a significant contribution to the total resistivity of prepared calcium-substituted Gd1-xCaxAlO3-δ ceramics with grain sizes in the range of 1.1-1.5 μm.pt_PT
dc.description.sponsorshipThis work was developed in the scope of bilateral cooperation between Slovakia and Portugal. The research was financed by the Slovak Research and Development Agency (APVV contract No. SK-PT-18-0039 and 19-0526) and by the FCT, Portugal. A.Y. acknowledges financial support within the project CICECO-Aveiro Institute of Materials (UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020) financed by national funds through the FCT/MCTES (PIDDAC).pt_PT
dc.language.isoengpt_PT
dc.publisherElsevierpt_PT
dc.relationinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50011%2F2020/PTpt_PT
dc.relationinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F50011%2F2020/PTpt_PT
dc.relationLA/P/0006/2020pt_PT
dc.rightsembargoedAccesspt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectGadolinium aluminatept_PT
dc.subjectMechanosynthesispt_PT
dc.subjectPhase transformationpt_PT
dc.subjectElectrical conductivitypt_PT
dc.subjectPerovskitept_PT
dc.titleMechanosynthesis and electrical conductivity of undoped and calcium-substituted GdAlO3 perovskitespt_PT
dc.typearticlept_PT
dc.description.versionpublishedpt_PT
dc.peerreviewedyespt_PT
degois.publication.titleJournal of Alloys and Compoundspt_PT
degois.publication.volume965pt_PT
dc.date.embargo2025-11-25-
dc.identifier.doi10.1016/j.jallcom.2023.171374pt_PT
dc.identifier.essn1873-4669pt_PT
dc.identifier.articlenumber171374pt_PT
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DEMaC - Artigos

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