XAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s method
| dc.contributor.author | Melo, Dulce Maria de Araújo | |
| dc.contributor.author | Borges, Filipe Martel de Magalhães | |
| dc.contributor.author | Ambrósio, Renato Canha | |
| dc.contributor.author | Pimentel, Patricia Mendonça | |
| dc.contributor.author | Silva Júnior, Carlos Neco da | |
| dc.contributor.author | Melo, Marcus Antônio de Freitas | |
| dc.date.accessioned | 2021-01-19T13:32:55Z | |
| dc.date.available | 2021-01-19T13:32:55Z | |
| dc.date.issued | 2006-03-20 | |
| dc.description.resumo | XAFS 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.citation | MELO, 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.doi | 10.1016/j.chemphys.2005.09.008 | |
| dc.identifier.issn | 0301-0104 | |
| dc.identifier.uri | https://repositorio.ufrn.br/handle/123456789/31275 | |
| dc.language | en | pt_BR |
| dc.publisher | Elsevier | pt_BR |
| dc.subject | XAFSJT | pt_BR |
| dc.subject | Oxygen desorption | pt_BR |
| dc.subject | La1−xSrxMnO3±δ catalysts | pt_BR |
| dc.subject | Defect | pt_BR |
| dc.subject | Distortion | pt_BR |
| dc.title | XAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s method | pt_BR |
| dc.type | article | pt_BR |
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