XAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s method

dc.contributor.authorMelo, Dulce Maria de Araújo
dc.contributor.authorBorges, Filipe Martel de Magalhães
dc.contributor.authorAmbrósio, Renato Canha
dc.contributor.authorPimentel, Patricia Mendonça
dc.contributor.authorSilva Júnior, Carlos Neco da
dc.contributor.authorMelo, Marcus Antônio de Freitas
dc.date.accessioned2021-01-19T13:32:55Z
dc.date.available2021-01-19T13:32:55Z
dc.date.issued2006-03-20
dc.description.resumoXAFS experiments at the Mn and Sr K-edges were carried out in order to investigate the short-range arrangement of Mn and Sr sites on La1−xSrxMnO3±δ highly doped perovskites (x = 0, 0.2, 0.4 and 0.6). The Mn K-edge EXAFS spectra show a static Jahn–Teller distortion of the MnO6 for x = 0 and 0.2, which is drastically reduced as x increases. The distortion of perovskite, characterized by the Mn–O–Mn tilt angle, progressively decreases with increasing Sr contents. Sr K-edge results indicated a decrease on the Sr–Mn coordination number upon Sr doping. Based on this and TPD results, a charge compensating mechanism is proposed suggesting a partial Mn oxidation and formation of Mn defect vacancies due to the introduction of Sr.pt_BR
dc.identifier.citationMELO, Dulce M.A.; BORGES, Filipe M.M.; AMBROSIO, Renato C.; PIMENTEL, Patrícia M.; SILVA JÚNIOR, Carlos N. da; MELO, Marcus A.F.. XAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s method. Chemical Physics, [S.L.], v. 322, n. 3, p. 477-484, mar. 2006. Disponível em: https://www.researchgate.net/publication/222741132_XAFS_characterization_of_La1-xSrxMnO3d_catalysts_prepared_by_Pechini's_method. Acesso em: 24 nov. 2020. http://dx.doi.org/10.1016/j.chemphys.2005.09.008.pt_BR
dc.identifier.doi10.1016/j.chemphys.2005.09.008
dc.identifier.issn0301-0104
dc.identifier.urihttps://repositorio.ufrn.br/handle/123456789/31275
dc.languageenpt_BR
dc.publisherElsevierpt_BR
dc.subjectXAFSJTpt_BR
dc.subjectOxygen desorptionpt_BR
dc.subjectLa1−xSrxMnO3±δ catalystspt_BR
dc.subjectDefectpt_BR
dc.subjectDistortionpt_BR
dc.titleXAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s methodpt_BR
dc.typearticlept_BR

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