Oxygen vacancy doping effect on the electrical and magnetic behavior of Ba5-xLaxNb4-x TixO15

Autores
de Paoli, Juan Martin; Carbonio, Raul Ernesto; Sanchez, Rodolfo Daniel
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We report electric and magnetic properties of oxygen deficient Ba5-xLaxNb4-x TixO15-δ phases, which have been prepared by solid-state reaction method followed by a controlled reduction process under hydrogen atmosphere. The extra electrons added by the formation of the oxygen vacancies (δ) introduce localized spins and the magnetic susceptibility can be described by a temperature-independent contribution and a Curie-Weiss term associated to the Ti3+ ion formation. Besides, the experimental resistivity (ρ) data of these four reduced compounds are well described in a wide temperature range with the equation ρ ≈ AT exp (B / T)- 1 / 4, which suggests the presence of small polarons in the system. Although, all samples present electrical insulating behavior, the electrical resistivity decreases four orders of magnitude for intermediate x values. We interpreted this fact as a consequence of the mix between the localized bands of the Nb and Ti ions, which favors the promotion of carriers due to reduction of the band gap.
Fil: de Paoli, Juan Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Carbonio, Raul Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Sanchez, Rodolfo Daniel. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina
Materia
A. Oxides
D. Electrical Conductivity
D. Magnetic Properties
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
OAI Identificador
oai:ri.conicet.gov.ar:11336/68578
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Oxygen vacancy doping effect on the electrical and magnetic behavior of Ba5-xLaxNb4-x TixO15de Paoli, Juan MartinCarbonio, Raul ErnestoSanchez, Rodolfo DanielA. OxidesD. Electrical ConductivityD. Magnetic Propertieshttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1We report electric and magnetic properties of oxygen deficient Ba5-xLaxNb4-x TixO15-δ phases, which have been prepared by solid-state reaction method followed by a controlled reduction process under hydrogen atmosphere. The extra electrons added by the formation of the oxygen vacancies (δ) introduce localized spins and the magnetic susceptibility can be described by a temperature-independent contribution and a Curie-Weiss term associated to the Ti3+ ion formation. Besides, the experimental resistivity (ρ) data of these four reduced compounds are well described in a wide temperature range with the equation ρ ≈ AT exp (B / T)- 1 / 4, which suggests the presence of small polarons in the system. Although, all samples present electrical insulating behavior, the electrical resistivity decreases four orders of magnitude for intermediate x values. We interpreted this fact as a consequence of the mix between the localized bands of the Nb and Ti ions, which favors the promotion of carriers due to reduction of the band gap.Fil: de Paoli, Juan Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Carbonio, Raul Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Sanchez, Rodolfo Daniel. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; ArgentinaPergamon-Elsevier Science Ltd2007-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/68578de Paoli, Juan Martin; Carbonio, Raul Ernesto; Sanchez, Rodolfo Daniel; Oxygen vacancy doping effect on the electrical and magnetic behavior of Ba5-xLaxNb4-x TixO15; Pergamon-Elsevier Science Ltd; Journal of Physics and Chemistry of Solids; 68; 2; 2-2007; 124-1300022-3697CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0022369706004410info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jpcs.2006.09.015info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:56:49Zoai:ri.conicet.gov.ar:11336/68578instacron: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:34982025-09-03 09:56:49.969CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Oxygen vacancy doping effect on the electrical and magnetic behavior of Ba5-xLaxNb4-x TixO15
title Oxygen vacancy doping effect on the electrical and magnetic behavior of Ba5-xLaxNb4-x TixO15
spellingShingle Oxygen vacancy doping effect on the electrical and magnetic behavior of Ba5-xLaxNb4-x TixO15
de Paoli, Juan Martin
A. Oxides
D. Electrical Conductivity
D. Magnetic Properties
title_short Oxygen vacancy doping effect on the electrical and magnetic behavior of Ba5-xLaxNb4-x TixO15
title_full Oxygen vacancy doping effect on the electrical and magnetic behavior of Ba5-xLaxNb4-x TixO15
title_fullStr Oxygen vacancy doping effect on the electrical and magnetic behavior of Ba5-xLaxNb4-x TixO15
title_full_unstemmed Oxygen vacancy doping effect on the electrical and magnetic behavior of Ba5-xLaxNb4-x TixO15
title_sort Oxygen vacancy doping effect on the electrical and magnetic behavior of Ba5-xLaxNb4-x TixO15
dc.creator.none.fl_str_mv de Paoli, Juan Martin
Carbonio, Raul Ernesto
Sanchez, Rodolfo Daniel
author de Paoli, Juan Martin
author_facet de Paoli, Juan Martin
Carbonio, Raul Ernesto
Sanchez, Rodolfo Daniel
author_role author
author2 Carbonio, Raul Ernesto
Sanchez, Rodolfo Daniel
author2_role author
author
dc.subject.none.fl_str_mv A. Oxides
D. Electrical Conductivity
D. Magnetic Properties
topic A. Oxides
D. Electrical Conductivity
D. Magnetic Properties
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We report electric and magnetic properties of oxygen deficient Ba5-xLaxNb4-x TixO15-δ phases, which have been prepared by solid-state reaction method followed by a controlled reduction process under hydrogen atmosphere. The extra electrons added by the formation of the oxygen vacancies (δ) introduce localized spins and the magnetic susceptibility can be described by a temperature-independent contribution and a Curie-Weiss term associated to the Ti3+ ion formation. Besides, the experimental resistivity (ρ) data of these four reduced compounds are well described in a wide temperature range with the equation ρ ≈ AT exp (B / T)- 1 / 4, which suggests the presence of small polarons in the system. Although, all samples present electrical insulating behavior, the electrical resistivity decreases four orders of magnitude for intermediate x values. We interpreted this fact as a consequence of the mix between the localized bands of the Nb and Ti ions, which favors the promotion of carriers due to reduction of the band gap.
Fil: de Paoli, Juan Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Carbonio, Raul Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Sanchez, Rodolfo Daniel. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina
description We report electric and magnetic properties of oxygen deficient Ba5-xLaxNb4-x TixO15-δ phases, which have been prepared by solid-state reaction method followed by a controlled reduction process under hydrogen atmosphere. The extra electrons added by the formation of the oxygen vacancies (δ) introduce localized spins and the magnetic susceptibility can be described by a temperature-independent contribution and a Curie-Weiss term associated to the Ti3+ ion formation. Besides, the experimental resistivity (ρ) data of these four reduced compounds are well described in a wide temperature range with the equation ρ ≈ AT exp (B / T)- 1 / 4, which suggests the presence of small polarons in the system. Although, all samples present electrical insulating behavior, the electrical resistivity decreases four orders of magnitude for intermediate x values. We interpreted this fact as a consequence of the mix between the localized bands of the Nb and Ti ions, which favors the promotion of carriers due to reduction of the band gap.
publishDate 2007
dc.date.none.fl_str_mv 2007-02
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/11336/68578
de Paoli, Juan Martin; Carbonio, Raul Ernesto; Sanchez, Rodolfo Daniel; Oxygen vacancy doping effect on the electrical and magnetic behavior of Ba5-xLaxNb4-x TixO15; Pergamon-Elsevier Science Ltd; Journal of Physics and Chemistry of Solids; 68; 2; 2-2007; 124-130
0022-3697
CONICET Digital
CONICET
url http://hdl.handle.net/11336/68578
identifier_str_mv de Paoli, Juan Martin; Carbonio, Raul Ernesto; Sanchez, Rodolfo Daniel; Oxygen vacancy doping effect on the electrical and magnetic behavior of Ba5-xLaxNb4-x TixO15; Pergamon-Elsevier Science Ltd; Journal of Physics and Chemistry of Solids; 68; 2; 2-2007; 124-130
0022-3697
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0022369706004410
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jpcs.2006.09.015
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
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
application/pdf
dc.publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
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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score 13.13397

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