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https://repositorio.ufrn.br/handle/123456789/31275| Title: | XAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s method |
| Authors: | Melo, Dulce Maria de Araújo Borges, Filipe Martel de Magalhães Ambrósio, Renato Canha Pimentel, Patricia Mendonça Silva Júnior, Carlos Neco da Melo, Marcus Antônio de Freitas |
| Keywords: | XAFSJT;Oxygen desorption;La1−xSrxMnO3±δ catalysts;Defect;Distortion |
| Issue Date: | 20-Mar-2006 |
| Publisher: | Elsevier |
| 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. |
| Portuguese Abstract: | 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. |
| URI: | https://repositorio.ufrn.br/handle/123456789/31275 |
| ISSN: | 0301-0104 |
| Appears in Collections: | CT - DEQ - Artigos publicados em periódicos ECT - Artigos publicados em periódicos IQ - Artigos publicados em periódicos |
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| XafsCharacterization_naotemMartelli_2006.pdf | 273,81 kB | Adobe PDF |  View/Open |
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