Enhancing Magnetic and Magnetotransport Properties by Topotactic Reduction of the Sr 2 Fe 1.33 Mo 0.66 O 6 Double Perovskite

Autores
Lopez, Carlos Alberto; Viola, María del Carmen; Pedregosa, Jose Carmelo; Alonso, José Antonio; Fernández Díaz, María Teresa
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Sr2Fe1.33Mo0.66O6 (alternately written as Sr3Fe2MoO9) perovskite has been prepared in polycrystalline form by thermal treatment, in air, of previously decomposed citrate precursors. This material has been studied by X-ray and neutron powder diffraction (XRPD and NPD), magnetic and transport measurements. At room temperature, the crystal structure is cubic with a = 7.8585(2) Å and V = 485.30(2) Å3, defined in the space group Fm-3m. Magnetic measurements indicate a ferromagnetic ordering below TC = 246 K. As prepared, the sample is an electrical insulator. A topotactic reduction of the stoichiometric sample performed at 600, 700, and 800 °C, in H2/N2 flows, leads to the oxygen-deficient double perovskites, Sr2Fe1.33Mo0.66O6?δ with increasing δ values. The evolution of the crystal structure upon reduction has been studied from XRPD and NPD data. For the sample obtained at 800 °C, exhibiting the largest δ value, the low-temperature evolution from NPD data was investigated between 2 K and 500 K: in all the temperature range the crystal structure is cubic with space group Fmequation imagem; at room temperature a = 7.87060(6) Å and V = 487.555(6) Å3. The magnetic behavior of this reduced sample suggests the presence of ferromagnetic domains characterized by Curie temperatures with TC > 400 K. The conductivity dramatically increases upon H2 reduction. Moreover, this reduced sample exhibits magnetoresistance, as high as 2.5 % at room temp. for H = 5 T. Magnetic and magnetotransport results are consistent with a large component of itinerancy for down-spin Mo t2g electrons, injected through hydrogen reduction.
Fil: Lopez, Carlos Alberto. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Área Química General e Inorgánica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Viola, María del Carmen. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Área Química General e Inorgánica; Argentina
Fil: Pedregosa, Jose Carmelo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Área Química General e Inorgánica; Argentina
Fil: Alonso, José Antonio. Consejo Superior de Investigaciones Científicas; España
Fil: Fernández Díaz, María Teresa. Institut Laue Langevin; Francia
Materia
DOUBLE PEROVSKITE
MAGNETIC PROPERTIES
HIDROGEN REDUCTION
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
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oai:ri.conicet.gov.ar:11336/281030
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Enhancing Magnetic and Magnetotransport Properties by Topotactic Reduction of the Sr 2 Fe 1.33 Mo 0.66 O 6 Double PerovskiteLopez, Carlos AlbertoViola, María del CarmenPedregosa, Jose CarmeloAlonso, José AntonioFernández Díaz, María TeresaDOUBLE PEROVSKITEMAGNETIC PROPERTIESHIDROGEN REDUCTIONhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Sr2Fe1.33Mo0.66O6 (alternately written as Sr3Fe2MoO9) perovskite has been prepared in polycrystalline form by thermal treatment, in air, of previously decomposed citrate precursors. This material has been studied by X-ray and neutron powder diffraction (XRPD and NPD), magnetic and transport measurements. At room temperature, the crystal structure is cubic with a = 7.8585(2) Å and V = 485.30(2) Å3, defined in the space group Fm-3m. Magnetic measurements indicate a ferromagnetic ordering below TC = 246 K. As prepared, the sample is an electrical insulator. A topotactic reduction of the stoichiometric sample performed at 600, 700, and 800 °C, in H2/N2 flows, leads to the oxygen-deficient double perovskites, Sr2Fe1.33Mo0.66O6?δ with increasing δ values. The evolution of the crystal structure upon reduction has been studied from XRPD and NPD data. For the sample obtained at 800 °C, exhibiting the largest δ value, the low-temperature evolution from NPD data was investigated between 2 K and 500 K: in all the temperature range the crystal structure is cubic with space group Fmequation imagem; at room temperature a = 7.87060(6) Å and V = 487.555(6) Å3. The magnetic behavior of this reduced sample suggests the presence of ferromagnetic domains characterized by Curie temperatures with TC > 400 K. The conductivity dramatically increases upon H2 reduction. Moreover, this reduced sample exhibits magnetoresistance, as high as 2.5 % at room temp. for H = 5 T. Magnetic and magnetotransport results are consistent with a large component of itinerancy for down-spin Mo t2g electrons, injected through hydrogen reduction.Fil: Lopez, Carlos Alberto. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Área Química General e Inorgánica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Viola, María del Carmen. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Área Química General e Inorgánica; ArgentinaFil: Pedregosa, Jose Carmelo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Área Química General e Inorgánica; ArgentinaFil: Alonso, José Antonio. Consejo Superior de Investigaciones Científicas; EspañaFil: Fernández Díaz, María Teresa. Institut Laue Langevin; FranciaWiley VCH Verlag2010-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/281030Lopez, Carlos Alberto; Viola, María del Carmen; Pedregosa, Jose Carmelo; Alonso, José Antonio; Fernández Díaz, María Teresa; Enhancing Magnetic and Magnetotransport Properties by Topotactic Reduction of the Sr 2 Fe 1.33 Mo 0.66 O 6 Double Perovskite; Wiley VCH Verlag; European Journal of Inorganic Chemistry; 2010; 26; 7-2010; 4110-41201434-1948CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1002/ejic.201000314info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-02-26T10:25:58Zoai:ri.conicet.gov.ar:11336/281030instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982026-02-26 10:25:58.518CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Enhancing Magnetic and Magnetotransport Properties by Topotactic Reduction of the Sr 2 Fe 1.33 Mo 0.66 O 6 Double Perovskite
title Enhancing Magnetic and Magnetotransport Properties by Topotactic Reduction of the Sr 2 Fe 1.33 Mo 0.66 O 6 Double Perovskite
spellingShingle Enhancing Magnetic and Magnetotransport Properties by Topotactic Reduction of the Sr 2 Fe 1.33 Mo 0.66 O 6 Double Perovskite
Lopez, Carlos Alberto
DOUBLE PEROVSKITE
MAGNETIC PROPERTIES
HIDROGEN REDUCTION
title_short Enhancing Magnetic and Magnetotransport Properties by Topotactic Reduction of the Sr 2 Fe 1.33 Mo 0.66 O 6 Double Perovskite
title_full Enhancing Magnetic and Magnetotransport Properties by Topotactic Reduction of the Sr 2 Fe 1.33 Mo 0.66 O 6 Double Perovskite
title_fullStr Enhancing Magnetic and Magnetotransport Properties by Topotactic Reduction of the Sr 2 Fe 1.33 Mo 0.66 O 6 Double Perovskite
title_full_unstemmed Enhancing Magnetic and Magnetotransport Properties by Topotactic Reduction of the Sr 2 Fe 1.33 Mo 0.66 O 6 Double Perovskite
title_sort Enhancing Magnetic and Magnetotransport Properties by Topotactic Reduction of the Sr 2 Fe 1.33 Mo 0.66 O 6 Double Perovskite
dc.creator.none.fl_str_mv Lopez, Carlos Alberto
Viola, María del Carmen
Pedregosa, Jose Carmelo
Alonso, José Antonio
Fernández Díaz, María Teresa
author Lopez, Carlos Alberto
author_facet Lopez, Carlos Alberto
Viola, María del Carmen
Pedregosa, Jose Carmelo
Alonso, José Antonio
Fernández Díaz, María Teresa
author_role author
author2 Viola, María del Carmen
Pedregosa, Jose Carmelo
Alonso, José Antonio
Fernández Díaz, María Teresa
author2_role author
author
author
author
dc.subject.none.fl_str_mv DOUBLE PEROVSKITE
MAGNETIC PROPERTIES
HIDROGEN REDUCTION
topic DOUBLE PEROVSKITE
MAGNETIC PROPERTIES
HIDROGEN REDUCTION
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Sr2Fe1.33Mo0.66O6 (alternately written as Sr3Fe2MoO9) perovskite has been prepared in polycrystalline form by thermal treatment, in air, of previously decomposed citrate precursors. This material has been studied by X-ray and neutron powder diffraction (XRPD and NPD), magnetic and transport measurements. At room temperature, the crystal structure is cubic with a = 7.8585(2) Å and V = 485.30(2) Å3, defined in the space group Fm-3m. Magnetic measurements indicate a ferromagnetic ordering below TC = 246 K. As prepared, the sample is an electrical insulator. A topotactic reduction of the stoichiometric sample performed at 600, 700, and 800 °C, in H2/N2 flows, leads to the oxygen-deficient double perovskites, Sr2Fe1.33Mo0.66O6?δ with increasing δ values. The evolution of the crystal structure upon reduction has been studied from XRPD and NPD data. For the sample obtained at 800 °C, exhibiting the largest δ value, the low-temperature evolution from NPD data was investigated between 2 K and 500 K: in all the temperature range the crystal structure is cubic with space group Fmequation imagem; at room temperature a = 7.87060(6) Å and V = 487.555(6) Å3. The magnetic behavior of this reduced sample suggests the presence of ferromagnetic domains characterized by Curie temperatures with TC > 400 K. The conductivity dramatically increases upon H2 reduction. Moreover, this reduced sample exhibits magnetoresistance, as high as 2.5 % at room temp. for H = 5 T. Magnetic and magnetotransport results are consistent with a large component of itinerancy for down-spin Mo t2g electrons, injected through hydrogen reduction.
Fil: Lopez, Carlos Alberto. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Área Química General e Inorgánica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Viola, María del Carmen. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Área Química General e Inorgánica; Argentina
Fil: Pedregosa, Jose Carmelo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Área Química General e Inorgánica; Argentina
Fil: Alonso, José Antonio. Consejo Superior de Investigaciones Científicas; España
Fil: Fernández Díaz, María Teresa. Institut Laue Langevin; Francia
description Sr2Fe1.33Mo0.66O6 (alternately written as Sr3Fe2MoO9) perovskite has been prepared in polycrystalline form by thermal treatment, in air, of previously decomposed citrate precursors. This material has been studied by X-ray and neutron powder diffraction (XRPD and NPD), magnetic and transport measurements. At room temperature, the crystal structure is cubic with a = 7.8585(2) Å and V = 485.30(2) Å3, defined in the space group Fm-3m. Magnetic measurements indicate a ferromagnetic ordering below TC = 246 K. As prepared, the sample is an electrical insulator. A topotactic reduction of the stoichiometric sample performed at 600, 700, and 800 °C, in H2/N2 flows, leads to the oxygen-deficient double perovskites, Sr2Fe1.33Mo0.66O6?δ with increasing δ values. The evolution of the crystal structure upon reduction has been studied from XRPD and NPD data. For the sample obtained at 800 °C, exhibiting the largest δ value, the low-temperature evolution from NPD data was investigated between 2 K and 500 K: in all the temperature range the crystal structure is cubic with space group Fmequation imagem; at room temperature a = 7.87060(6) Å and V = 487.555(6) Å3. The magnetic behavior of this reduced sample suggests the presence of ferromagnetic domains characterized by Curie temperatures with TC > 400 K. The conductivity dramatically increases upon H2 reduction. Moreover, this reduced sample exhibits magnetoresistance, as high as 2.5 % at room temp. for H = 5 T. Magnetic and magnetotransport results are consistent with a large component of itinerancy for down-spin Mo t2g electrons, injected through hydrogen reduction.
publishDate 2010
dc.date.none.fl_str_mv 2010-07
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/281030
Lopez, Carlos Alberto; Viola, María del Carmen; Pedregosa, Jose Carmelo; Alonso, José Antonio; Fernández Díaz, María Teresa; Enhancing Magnetic and Magnetotransport Properties by Topotactic Reduction of the Sr 2 Fe 1.33 Mo 0.66 O 6 Double Perovskite; Wiley VCH Verlag; European Journal of Inorganic Chemistry; 2010; 26; 7-2010; 4110-4120
1434-1948
CONICET Digital
CONICET
url http://hdl.handle.net/11336/281030
identifier_str_mv Lopez, Carlos Alberto; Viola, María del Carmen; Pedregosa, Jose Carmelo; Alonso, José Antonio; Fernández Díaz, María Teresa; Enhancing Magnetic and Magnetotransport Properties by Topotactic Reduction of the Sr 2 Fe 1.33 Mo 0.66 O 6 Double Perovskite; Wiley VCH Verlag; European Journal of Inorganic Chemistry; 2010; 26; 7-2010; 4110-4120
1434-1948
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1002/ejic.201000314
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley VCH Verlag
publisher.none.fl_str_mv Wiley VCH Verlag
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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