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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:'s_method. Acesso em: 24 nov. 2020.
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.
ISSN: 0301-0104
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ECT - Artigos publicados em periódicos
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