Experimental and theoretical interpretation of the order/disorder clusters in CeO2:La

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Autor(es): dc.contributorUniversidade Federal de São Carlos (UFSCar)-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorFederal University of Paraiba-
Autor(es): dc.contributorInstitute of Materials Science and Technology (INTEMA)-
Autor(es): dc.creatorRocha, Leandro Silva Rosa-
Autor(es): dc.creatorAparecido Ciola Amoresi, Rafael [UNESP]-
Autor(es): dc.creatorDuarte, Thiago Marinho [UNESP]-
Autor(es): dc.creatorMarana, Naiara Letícia [UNESP]-
Autor(es): dc.creatorSambrano, Julio Ricardo [UNESP]-
Autor(es): dc.creatorAldao, Celso Manuel-
Autor(es): dc.creatorSimões, Alexandre Zirpoli [UNESP]-
Autor(es): dc.creatorPonce, Miguel Adolfo-
Autor(es): dc.creatorLongo, Elson-
Data de aceite: dc.date.accessioned2022-02-22T00:33:40Z-
Data de disponibilização: dc.date.available2022-02-22T00:33:40Z-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-04-30-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.apsusc.2019.145216-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/201484-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/201484-
Descrição: dc.descriptionA spectroscopic study of nanostructured lanthanum-doped cerium oxide samples showed that a mild decrease by 5.3% in the surface concentration of Ce(III) species and, a reduction by 0.2 eV in the so-called energy-gap (EF – Ev) after lanthanum addition was sufficient to create the previously reported significant dual behavior when exposed to carbon monoxide at 653 K. The observed X-ray diffraction patterns indicated the presence of a pure fluorite-type crystalline structure. A higher presence of paramagnetic defects clusters, indicated by electron paramagnetic resonance spectroscopy measurements and confirmed by the X-ray photoelectron spectroscopy, was attributed as being responsible for its dual behavior in a CO(g) atmosphere. Theoretical studies have shown the band structure and density of state of the pure and doped material, illustrating the orbitals that participate in the valence band and conduction band. The addition of a small quantity of La3+ converted some Ce3+ into Ce4+, narrowed the “effective band-gap” by 0.2 eV, and created a singly ionized oxygen vacancy species, thus changing the total electrical resistance and creating its dual behavior. The exposure to a reducing atmosphere such as carbon monoxide resulted in a significant increase in defects and converted some Ce4+ into Ce3+ and vice-versa with oxygen atmosphere exposure.-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionFederal University of Sao Carlos (UFSCar) Department of Chemistry-
Descrição: dc.descriptionSao Paulo State University (UNESP) School of Engineering-
Descrição: dc.descriptionLACOM/INCTMN Federal University of Paraiba-
Descrição: dc.descriptionSao Paulo State University (UNESP) School of Sciences-
Descrição: dc.descriptionInstitute of Materials Science and Technology (INTEMA), Mar del Plata-
Descrição: dc.descriptionSao Paulo State University (UNESP) School of Engineering-
Descrição: dc.descriptionSao Paulo State University (UNESP) School of Sciences-
Idioma: dc.languageen-
Relação: dc.relationApplied Surface Science-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectCarbon monoxide-
Palavras-chave: dc.subjectCerium oxide-
Palavras-chave: dc.subjectDefects-
Palavras-chave: dc.subjectLanthanum-
Palavras-chave: dc.subjectX-ray photoelectron spectroscopy-
Título: dc.titleExperimental and theoretical interpretation of the order/disorder clusters in CeO2:La-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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