XAS structural characterization of La1xAxCoO3 doped with calcium and barium as a function of temperature

Detalhes bibliográficos
Autor(a) principal: Melo, Marcus Antônio de Freitas
Data de Publicação: 2017
Outros Autores: Gomes, Washington C.M., Melo, Dulce Maria de Araújo, Pimentel, Washington C., Marinho, Érika Pinto, Nasar, Ricardo Silveira
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRN
Texto Completo: https://repositorio.ufrn.br/handle/123456789/45286
Resumo: The temperature dependence of La0.8Ba0.2CoO3 and La0.8Ca0.2CoO3 perovskite structures was investigated, and the LaCoO3 structure was analyzed at room temperature. These materials were characterized by X-ray absorption spectroscopy (XAS) at the cobalt K-edge, and both the X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) data were analyzed. The correlated Einstein model was used in the EXAFS data analysis. These materials were prepared by the combustion method. The structures of LaCoO3 at room temperature and of the Ca2+- and Ba2+-doped samples in the temperature range of 50 K–298 K the CoO6 octahedron have a distorted monoclinic I2/a symmetry. However, the Ba2+-doped sample the CoO6 octahedron has a slightly distorted rhombohedral R-3c symmetry at 50 K, 220 K and 260 K. The La0.8Ca0.2CoO3 structure does not vary much with temperature and has a more distorted Co octahedron and higher local thermal disorder
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spelling Melo, Marcus Antônio de FreitasGomes, Washington C.M.Melo, Dulce Maria de AraújoPimentel, Washington C.Marinho, Érika PintoNasar, Ricardo Silveira2021-12-08T17:49:23Z2021-12-08T17:49:23Z2017-06-20GOMES, W. C.M.; MELO, D. M. A.; PIMENTEL, P. M.; MARINHO, E. P.; MELO, M. A. F.; NASAR, R. S.. XAS structural characterization of La 1−x A x CoO 3 doped with calcium and barium as a function of temperature. CHEMICAL PHYSICS, v. 490, p. 67-74, 2017. Disponível em: https://www.sciencedirect.com/science/article/pii/S0301010416307674. Acesso em: 13 out 2021. https://doi.org/10.1016/j.chemphys.2017.04.0080301-0104https://repositorio.ufrn.br/handle/123456789/4528610.1016/j.chemphys.2017.04.008ElsevierX-ray absorption spectroscopyLaCoO3La0.8Ba0.2CoO3Spin-state transitionCombustion methodLa0.8Ca0.2CoO3XAS structural characterization of La1xAxCoO3 doped with calcium and barium as a function of temperatureinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleThe temperature dependence of La0.8Ba0.2CoO3 and La0.8Ca0.2CoO3 perovskite structures was investigated, and the LaCoO3 structure was analyzed at room temperature. These materials were characterized by X-ray absorption spectroscopy (XAS) at the cobalt K-edge, and both the X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) data were analyzed. The correlated Einstein model was used in the EXAFS data analysis. These materials were prepared by the combustion method. The structures of LaCoO3 at room temperature and of the Ca2+- and Ba2+-doped samples in the temperature range of 50 K–298 K the CoO6 octahedron have a distorted monoclinic I2/a symmetry. However, the Ba2+-doped sample the CoO6 octahedron has a slightly distorted rhombohedral R-3c symmetry at 50 K, 220 K and 260 K. The La0.8Ca0.2CoO3 structure does not vary much with temperature and has a more distorted Co octahedron and higher local thermal disorderengreponame: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/123456789/45286/2/license_rdf4d2950bda3d176f570a9f8b328dfbbefMD52LICENSElicense.txtlicense.txttext/plain; charset=utf-81484https://repositorio.ufrn.br/bitstream/123456789/45286/3/license.txte9597aa2854d128fd968be5edc8a28d9MD53123456789/452862023-02-01 17:23:48.19oai:https://repositorio.ufrn.br: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Repositório de PublicaçõesPUBhttp://repositorio.ufrn.br/oai/opendoar:2023-02-01T20:23:48Repositório Institucional da UFRN - Universidade Federal do Rio Grande do Norte (UFRN)false
dc.title.pt_BR.fl_str_mv XAS structural characterization of La1xAxCoO3 doped with calcium and barium as a function of temperature
title XAS structural characterization of La1xAxCoO3 doped with calcium and barium as a function of temperature
spellingShingle XAS structural characterization of La1xAxCoO3 doped with calcium and barium as a function of temperature
Melo, Marcus Antônio de Freitas
X-ray absorption spectroscopy
LaCoO3
La0.8Ba0.2CoO3
Spin-state transition
Combustion method
La0.8Ca0.2CoO3
title_short XAS structural characterization of La1xAxCoO3 doped with calcium and barium as a function of temperature
title_full XAS structural characterization of La1xAxCoO3 doped with calcium and barium as a function of temperature
title_fullStr XAS structural characterization of La1xAxCoO3 doped with calcium and barium as a function of temperature
title_full_unstemmed XAS structural characterization of La1xAxCoO3 doped with calcium and barium as a function of temperature
title_sort XAS structural characterization of La1xAxCoO3 doped with calcium and barium as a function of temperature
author Melo, Marcus Antônio de Freitas
author_facet Melo, Marcus Antônio de Freitas
Gomes, Washington C.M.
Melo, Dulce Maria de Araújo
Pimentel, Washington C.
Marinho, Érika Pinto
Nasar, Ricardo Silveira
author_role author
author2 Gomes, Washington C.M.
Melo, Dulce Maria de Araújo
Pimentel, Washington C.
Marinho, Érika Pinto
Nasar, Ricardo Silveira
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Melo, Marcus Antônio de Freitas
Gomes, Washington C.M.
Melo, Dulce Maria de Araújo
Pimentel, Washington C.
Marinho, Érika Pinto
Nasar, Ricardo Silveira
dc.subject.por.fl_str_mv X-ray absorption spectroscopy
LaCoO3
La0.8Ba0.2CoO3
Spin-state transition
Combustion method
La0.8Ca0.2CoO3
topic X-ray absorption spectroscopy
LaCoO3
La0.8Ba0.2CoO3
Spin-state transition
Combustion method
La0.8Ca0.2CoO3
description The temperature dependence of La0.8Ba0.2CoO3 and La0.8Ca0.2CoO3 perovskite structures was investigated, and the LaCoO3 structure was analyzed at room temperature. These materials were characterized by X-ray absorption spectroscopy (XAS) at the cobalt K-edge, and both the X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) data were analyzed. The correlated Einstein model was used in the EXAFS data analysis. These materials were prepared by the combustion method. The structures of LaCoO3 at room temperature and of the Ca2+- and Ba2+-doped samples in the temperature range of 50 K–298 K the CoO6 octahedron have a distorted monoclinic I2/a symmetry. However, the Ba2+-doped sample the CoO6 octahedron has a slightly distorted rhombohedral R-3c symmetry at 50 K, 220 K and 260 K. The La0.8Ca0.2CoO3 structure does not vary much with temperature and has a more distorted Co octahedron and higher local thermal disorder
publishDate 2017
dc.date.issued.fl_str_mv 2017-06-20
dc.date.accessioned.fl_str_mv 2021-12-08T17:49:23Z
dc.date.available.fl_str_mv 2021-12-08T17:49:23Z
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 GOMES, W. C.M.; MELO, D. M. A.; PIMENTEL, P. M.; MARINHO, E. P.; MELO, M. A. F.; NASAR, R. S.. XAS structural characterization of La 1−x A x CoO 3 doped with calcium and barium as a function of temperature. CHEMICAL PHYSICS, v. 490, p. 67-74, 2017. Disponível em: https://www.sciencedirect.com/science/article/pii/S0301010416307674. Acesso em: 13 out 2021. https://doi.org/10.1016/j.chemphys.2017.04.008
dc.identifier.uri.fl_str_mv https://repositorio.ufrn.br/handle/123456789/45286
dc.identifier.issn.none.fl_str_mv 0301-0104
dc.identifier.doi.none.fl_str_mv 10.1016/j.chemphys.2017.04.008
identifier_str_mv GOMES, W. C.M.; MELO, D. M. A.; PIMENTEL, P. M.; MARINHO, E. P.; MELO, M. A. F.; NASAR, R. S.. XAS structural characterization of La 1−x A x CoO 3 doped with calcium and barium as a function of temperature. CHEMICAL PHYSICS, v. 490, p. 67-74, 2017. Disponível em: https://www.sciencedirect.com/science/article/pii/S0301010416307674. Acesso em: 13 out 2021. https://doi.org/10.1016/j.chemphys.2017.04.008
0301-0104
10.1016/j.chemphys.2017.04.008
url https://repositorio.ufrn.br/handle/123456789/45286
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFRN
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