119928 20240319081018.0 doi 10.1016/j.jssc.2022.123525 sideral 130718 ART-2022-130718 eng Orera, Alodia Universidad de Zaragoza (orcid)0000-0001-8751-0983 Eutectic ceramics of the CeO2 – ZrO2 – MgO system produced by laser-assisted directional solidification 2022 Access copy available to the general public Unrestricted Oxide eutectics have great potentiality as structural or functional materials, owing to the outstanding properties derived from the eutectic microstructure. Among them, the eutectic of the ZrO2 – MgO system is particularly noteworthy because of the unusual combination of thermomechanical, optical and electrical properties. In a recent application, Zr1-δMgδO2-δ – MgO eutectic oxides have been used to produce porous supports for molten-carbonate based CO2 separation membranes. Here we explore composite ceramic oxides of the CexZr1-xO2 – MgO (x ​≤ ​0.5) system with eutectic microstructure, with the motivation that incorporating cerium may enhance the CO2 permeation properties. Eutectic composites with different cerium content are produced by a laser-assisted directional solidification technique at variable solidification rate, v. In all cases the composite bicrystal consists of two phases, MgO and a fluorite-like (CexZr1-x)1-yMgyO2-y phase. A purely fibrilar microstructure is found for x ​≥ ​0.3 ​at v ​= ​25 ​mm/h, with MgO fibres embedded within the fluorite-like matrix. The MgO mol% in the eutectic composites decreases from ∼53% for x ​= ​0 to ∼48% for x ​= ​0.5. X-ray and Raman results evidence long-range ordering in a quasi-tetragonal monoclinic symmetry for x ​= ​0.5. Impedance spectroscopy results are consistent with a change from ionic to mainly electronic conductivity when the atmosphere is changed from air or Ar to 5%H2–Ar. info:eu-repo/grantAgreement/ES/DGA/T02-20R info:eu-repo/grantAgreement/ES/MCINN/AEI/RYC2018-025553-I info:eu-repo/grantAgreement/ES/MCINN/FEDER/PID2019-107106RB-C32 info:eu-repo/grantAgreement/ES/MCINN/FEDER/PID2021-124863OB-I00 info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 3.3 2022 CHEMISTRY, INORGANIC & NUCLEAR 13 / 42 = 0.31 2022 Q2 T1 CHEMISTRY, PHYSICAL 88 / 161 = 0.547 2022 Q3 T2 0.58 2022 Ceramics and Composites 2022 Q2 Condensed Matter Physics 2022 Q2 Physical and Theoretical Chemistry 2022 Q2 Inorganic Chemistry 2022 Q2 Materials Chemistry 2022 Q2 Electronic, Optical and Magnetic Materials 2022 Q2 5.6 2022 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Oliete, Patricia B. Universidad de Zaragoza (orcid)0000-0003-3480-398X Merino, Rosa I. (orcid)0000-0003-0747-405X Sanjuán, María Luisa (orcid)0000-0002-5793-2058 5001 065 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Cienc.Mater. Ingen.Metal. 315 (2022), 123525 [9 pp] J. solid state chem. JOURNAL OF SOLID STATE CHEMISTRY 0022-4596 2297607 http://zaguan.unizar.es/record/119928/files/texto_completo.pdf Versión publicada 2587320 http://zaguan.unizar.es/record/119928/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:119928 articulos driver 2024-03-18-15:52:35 ARTICLE