000097331 001__ 97331
000097331 005__ 20210507081950.0
000097331 0247_ $$2doi$$a10.1002/jrs.5797
000097331 0248_ $$2sideral$$a115971
000097331 037__ $$aART-2019-115971
000097331 041__ $$aeng
000097331 100__ $$0(orcid)0000-0003-3480-398X$$aOliete, Patricia B.$$uUniversidad de Zaragoza
000097331 245__ $$aSpectroscopic insight into the interplay between structural disorder and oxidation degree in melt-grown Ce0.5Zr0.5O2-y compounds
000097331 260__ $$c2019
000097331 5060_ $$aAccess copy available to the general public$$fUnrestricted
000097331 5203_ $$aThe oxygen storage capacity of CexZr1-xO2-y compounds arises from the mixed-valent character of cerium, which makes the system sensitive to external factors such as temperature and oxygen partial pressure through their influence in the Ce valence, cation ordering and oxygen content. In this work, we analyze the phase relations in Ce0.5Zr0.5O2-y compounds fabricated by the laser floating zone technique in either oxidising or reducing atmosphere. Chemical, structural, and microstructural properties are studied by X-ray diffraction, thermogravimetry, scanning electron microscopy (energy dispersive X-ray and electron backscatter diffraction), and Raman spectroscopy. The latter proves to be determinant to discriminate between phases arising from subtle variations of atomic distribution that are hardly distinguished by X-ray diffraction or energy dispersive X-ray analyses. Cation disordered, fluorite-like phases are obtained when processing is performed in air, whereas cation-ordered, pyrochlore-related phases are formed when processing in Ar+5%H2 atmosphere. Processing in a low but non-negligible pO2 yields, besides the pyrochlore and fluorite-like phases, an intermediate state with partial disorder that may be relevant for catalysis applications. The vibrational Raman spectrum of the Ce2Zr2O7 pyrochlore has been fully interpreted through polarisation measurements at room and low temperature. Bands arising from crystal field transitions within the ground and first excited multiplets of Ce3+ ions are also identified. The electronic Raman spectrum is found to be a sensitive probe of the degree of cation and oxygen order in these compounds.
000097331 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/MAT2016-77769-R
000097331 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000097331 590__ $$a2.0$$b2019
000097331 591__ $$aSPECTROSCOPY$$b19 / 42 = 0.452$$c2019$$dQ2$$eT2
000097331 592__ $$a0.759$$b2019
000097331 593__ $$aSpectroscopy$$c2019$$dQ2
000097331 593__ $$aMaterials Science (miscellaneous)$$c2019$$dQ2
000097331 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000097331 700__ $$0(orcid)0000-0001-8751-0983$$aOrera, Alodia$$uUniversidad de Zaragoza
000097331 700__ $$0(orcid)0000-0002-5793-2058$$aSanjuán, María Luisa$$uUniversidad de Zaragoza
000097331 7102_ $$15001$$2065$$aUniversidad de Zaragoza$$bDpto. Ciencia Tecnol.Mater.Fl.$$cÁrea Cienc.Mater. Ingen.Metal.
000097331 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada
000097331 773__ $$g51, 3 (2019), 514-527$$pJ. Raman spectrosc.$$tJOURNAL OF RAMAN SPECTROSCOPY$$x0377-0486
000097331 8564_ $$s1928149$$uhttps://zaguan.unizar.es/record/97331/files/texto_completo.pdf$$yPostprint
000097331 8564_ $$s144572$$uhttps://zaguan.unizar.es/record/97331/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
000097331 909CO $$ooai:zaguan.unizar.es:97331$$particulos$$pdriver
000097331 951__ $$a2021-05-07-08:11:45
000097331 980__ $$aARTICLE