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

Detalhes bibliográficos
Autor(a) principal: Melo, Dulce Maria de Araújo
Data de Publicação: 2006
Outros Autores: Borges, Filipe Martel de Magalhães, Ambrósio, Renato Canha, Pimentel, Patricia Mendonça, Silva Júnior, Carlos Neco da, Melo, Marcus Antônio de Freitas
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRN
Texto Completo: https://repositorio.ufrn.br/handle/123456789/31275
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.
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spelling Melo, Dulce Maria de AraújoBorges, Filipe Martel de MagalhãesAmbrósio, Renato CanhaPimentel, Patricia MendonçaSilva Júnior, Carlos Neco daMelo, Marcus Antônio de Freitas2021-01-19T13:32:55Z2021-01-19T13:32:55Z2006-03-20MELO, 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.2005.09.008.0301-0104https://repositorio.ufrn.br/handle/123456789/3127510.1016/j.chemphys.2005.09.008ElsevierXAFSJTOxygen desorptionLa1−xSrxMnO3±δ catalystsDefectDistortionXAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s methodinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleXAFS 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.engreponame:Repositório Institucional da UFRNinstname:Universidade Federal do Rio Grande do Norte (UFRN)instacron:UFRNinfo:eu-repo/semantics/openAccessCC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8914https://repositorio.ufrn.br/bitstream/123456789/31275/2/license_rdf4d2950bda3d176f570a9f8b328dfbbefMD52LICENSElicense.txtlicense.txttext/plain; charset=utf-81484https://repositorio.ufrn.br/bitstream/123456789/31275/3/license.txte9597aa2854d128fd968be5edc8a28d9MD53TEXTXafsCharacterization_naotemMartelli_2006.pdf.txtXafsCharacterization_naotemMartelli_2006.pdf.txtExtracted texttext/plain37742https://repositorio.ufrn.br/bitstream/123456789/31275/4/XafsCharacterization_naotemMartelli_2006.pdf.txtb302325e73caff2bcdec7eea8d5a38daMD54THUMBNAILXafsCharacterization_naotemMartelli_2006.pdf.jpgXafsCharacterization_naotemMartelli_2006.pdf.jpgGenerated Thumbnailimage/jpeg1748https://repositorio.ufrn.br/bitstream/123456789/31275/5/XafsCharacterization_naotemMartelli_2006.pdf.jpg4e558897753ece2d674eed0dd3ad5666MD55123456789/312752023-02-01 17:23:19.597oai:https://repositorio.ufrn.br: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Repositório de PublicaçõesPUBhttp://repositorio.ufrn.br/oai/opendoar:2023-02-01T20:23:19Repositório Institucional da UFRN - Universidade Federal do Rio Grande do Norte (UFRN)false
dc.title.pt_BR.fl_str_mv XAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s method
title XAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s method
spellingShingle XAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s method
Melo, Dulce Maria de Araújo
XAFSJT
Oxygen desorption
La1−xSrxMnO3±δ catalysts
Defect
Distortion
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
author Melo, Dulce Maria de Araújo
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_role author
author2 Borges, Filipe Martel de Magalhães
Ambrósio, Renato Canha
Pimentel, Patricia Mendonça
Silva Júnior, Carlos Neco da
Melo, Marcus Antônio de Freitas
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv 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
dc.subject.por.fl_str_mv XAFSJT
Oxygen desorption
La1−xSrxMnO3±δ catalysts
Defect
Distortion
topic XAFSJT
Oxygen desorption
La1−xSrxMnO3±δ catalysts
Defect
Distortion
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.
publishDate 2006
dc.date.issued.fl_str_mv 2006-03-20
dc.date.accessioned.fl_str_mv 2021-01-19T13:32:55Z
dc.date.available.fl_str_mv 2021-01-19T13:32:55Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.citation.fl_str_mv 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.
dc.identifier.uri.fl_str_mv https://repositorio.ufrn.br/handle/123456789/31275
dc.identifier.issn.none.fl_str_mv 0301-0104
dc.identifier.doi.none.fl_str_mv 10.1016/j.chemphys.2005.09.008
identifier_str_mv 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
10.1016/j.chemphys.2005.09.008
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