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

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, whic...

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Principais autores:	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
Formato:	article
Idioma:	English
Publicado em:	Elsevier
Assuntos:	XAFSJT Oxygen desorption La1−xSrxMnO3±δ catalysts Defect Distortion
Endereço do item:	https://repositorio.ufrn.br/handle/123456789/31275
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spelling	ri-123456789-312752023-02-01T20:23:19Z XAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s method 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 XAFSJT Oxygen desorption La1−xSrxMnO3±δ catalysts Defect Distortion 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. 2021-01-19T13:32:55Z 2021-01-19T13:32:55Z 2006-03-20 article 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. 0301-0104 https://repositorio.ufrn.br/handle/123456789/31275 10.1016/j.chemphys.2005.09.008 en Elsevier
institution	Repositório Institucional
collection	RI - UFRN
language	English
topic	XAFSJT Oxygen desorption La1−xSrxMnO3±δ catalysts Defect Distortion
spellingShingle	XAFSJT Oxygen desorption La1−xSrxMnO3±δ catalysts Defect Distortion 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 XAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s method
description	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.
format	article
author	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
author_facet	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
author_sort	Melo, Dulce Maria de Araújo
title	XAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s method
title_short	XAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s method
title_full	XAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s method
title_fullStr	XAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s method
title_full_unstemmed	XAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s method
title_sort	xafs characterization of la1−xsrxmno3±δ catalysts prepared by pechini’s method
publisher	Elsevier
publishDate	2021
url	https://repositorio.ufrn.br/handle/123456789/31275
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XAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s method

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