000126984 001__ 126984 000126984 005__ 20241125101147.0 000126984 0247_ $$2doi$$a10.1111/jace.19305 000126984 0248_ $$2sideral$$a134342 000126984 037__ $$aART-2023-134342 000126984 041__ $$aeng 000126984 100__ $$aGrima, Lorena 000126984 245__ $$aCeramics with eutectic microstructure in the ZrO2–PrOx system 000126984 260__ $$c2023 000126984 5060_ $$aAccess copy available to the general public$$fUnrestricted 000126984 5203_ $$aPraseodymium oxides present redox properties analogous to those of Ce‐based systems and have been proposed for catalytic applications in combination with CeO2, ZrO2, or both. However, uncertainties remain concerning the nature and redox behavior of Pr‐rich mixtures, especially with ZrO2. Here we study the eutectic composites of the ZrO2–PrOx system, focusing on the sensitivity of their microstructure, phase symmetry, and composition to variations of the processing atmosphere from oxidizing to reducing. Mixed oxides have been produced by a laser‐assisted directional solidification technique in O2, air, N2, or 5%H2(Ar) environment, and the resulting materials have been analyzed by scanning electron microscopy/energy‐dispersive X‐ray spectroscopy, X‐ray diffraction, Raman spectroscopy, and magnetic susceptibility. In air, N2, or 5%H2(Ar) atmosphere, a lamellar, eutectic‐like microstructure forms, the major phase being the one with less Pr content. Both the Pr concentration in each phase as the PrOx molar percentage of the eutectic composites decrease as the atmosphere becomes more reducing. Both eutectic phases are fluorite‐like when processing in air, whereas in N2 or 5%H2(Ar), the phase with high Pr content is of the A‐R2O3 type, and the phase with low Pr content can be described as a fluorite phase containing C‐R2O3‐like short‐range‐ordered regions. The results obtained for samples processed in O2 suggest that for high enough pO2 no eutectic forms, in analogy with the ZrO2–CeO2 system. The evolution of the phase composition and symmetry is discussed in terms of the limited stability of the phases found in the ZrO2–Pr2O3 system, namely, A‐ or C‐R2O3‐like, beyond a certain Pr oxidation degree and oxygen content. 000126984 536__ $$9info:eu-repo/grantAgreement/ES/MCINN/FEDER/PID2021-124863OB-I00$$9info:eu-repo/grantAgreement/ES/MCINN/FEDER/PID2019-107106RB-C32$$9info:eu-repo/grantAgreement/ES/DGA/T02-20R$$9info:eu-repo/grantAgreement/ES/MICINN/FEDER/BES-2017-079683 000126984 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc$$uhttp://creativecommons.org/licenses/by-nc/3.0/es/ 000126984 590__ $$a3.5$$b2023 000126984 592__ $$a0.819$$b2023 000126984 591__ $$aMATERIALS SCIENCE, CERAMICS$$b4 / 31 = 0.129$$c2023$$dQ1$$eT1 000126984 593__ $$aMaterials Chemistry$$c2023$$dQ1 000126984 593__ $$aCeramics and Composites$$c2023$$dQ1 000126984 594__ $$a7.5$$b2023 000126984 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000126984 700__ $$0(orcid)0000-0003-2242-6822$$aPeña, José Ignacio$$uUniversidad de Zaragoza 000126984 700__ $$0(orcid)0000-0002-5793-2058$$aSanjuán, María Luisa 000126984 7102_ $$15001$$2065$$aUniversidad de Zaragoza$$bDpto. Ciencia Tecnol.Mater.Fl.$$cÁrea Cienc.Mater. Ingen.Metal. 000126984 773__ $$g106, 11 (2023), 7098-7108$$pJ. Am. Ceram. Soc.$$tJOURNAL OF THE AMERICAN CERAMIC SOCIETY$$x0002-7820 000126984 8564_ $$s2281207$$uhttps://zaguan.unizar.es/record/126984/files/texto_completo.pdf$$yVersión publicada 000126984 8564_ $$s1960910$$uhttps://zaguan.unizar.es/record/126984/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000126984 909CO $$ooai:zaguan.unizar.es:126984$$particulos$$pdriver 000126984 951__ $$a2024-11-22-12:04:50 000126984 980__ $$aARTICLE