Electrical conductivity and dielectric properties of Sr doped M-type barium hexaferrite BaFe12O19
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/105438 https://doi.org/10.1039/d0ra09465j |
Resumo: | The Raman results showed that the intensity of the resonance band remains unchanged in Ba1 xSrxFe12O19 compared to the undoped compound (x ¼ 0) indicating that the polarizability did not change during the vibrations. The particle sizes, observed by TEM, are reduced from 228 nm to 176 nm with doping. Electrical conductance measurements show that all samples present semiconductor-like behaviors. The Maxwell–Wagner model explains why the alternating electrical conductivity of the samples doped with Sr is lower compared to that of the undoped sample. The Correlated Barrier Hopping (CBH) model dominates the conduction process for the BaFe12O19 sample, whereas the No overlapping Small Polaron Tunneling (NSPT) model dominates the conduction process for the Ba0.5Sr0.5- Fe12O19 sample. For SrFe12O19 the conduction is dominated by the NSPT model at temperatures below 240 K and by the CBH model above 240 K. The BaFe12O19 compound exhibits a giant dielectric constant (3 0) whose values reached 104 at low frequencies. This value is reduced to 150 in the Sr-doped hexaferrite. |
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Electrical conductivity and dielectric properties of Sr doped M-type barium hexaferrite BaFe12O19The Raman results showed that the intensity of the resonance band remains unchanged in Ba1 xSrxFe12O19 compared to the undoped compound (x ¼ 0) indicating that the polarizability did not change during the vibrations. The particle sizes, observed by TEM, are reduced from 228 nm to 176 nm with doping. Electrical conductance measurements show that all samples present semiconductor-like behaviors. The Maxwell–Wagner model explains why the alternating electrical conductivity of the samples doped with Sr is lower compared to that of the undoped sample. The Correlated Barrier Hopping (CBH) model dominates the conduction process for the BaFe12O19 sample, whereas the No overlapping Small Polaron Tunneling (NSPT) model dominates the conduction process for the Ba0.5Sr0.5- Fe12O19 sample. For SrFe12O19 the conduction is dominated by the NSPT model at temperatures below 240 K and by the CBH model above 240 K. The BaFe12O19 compound exhibits a giant dielectric constant (3 0) whose values reached 104 at low frequencies. This value is reduced to 150 in the Sr-doped hexaferrite.Royal Society of Chemistry2021-01-04info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/105438http://hdl.handle.net/10316/105438https://doi.org/10.1039/d0ra09465jeng354241232046-2069Marouani, Y.Massoudi, J.Noumi, M.Benali, A.Dhahri, E.Sanguino, P.Graça, M. P. F.Valente, M. A.Costa, B. F. O.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-02-28T10:13:47Zoai:estudogeral.uc.pt:10316/105438Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:22:00.440157Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Electrical conductivity and dielectric properties of Sr doped M-type barium hexaferrite BaFe12O19 |
title |
Electrical conductivity and dielectric properties of Sr doped M-type barium hexaferrite BaFe12O19 |
spellingShingle |
Electrical conductivity and dielectric properties of Sr doped M-type barium hexaferrite BaFe12O19 Marouani, Y. |
title_short |
Electrical conductivity and dielectric properties of Sr doped M-type barium hexaferrite BaFe12O19 |
title_full |
Electrical conductivity and dielectric properties of Sr doped M-type barium hexaferrite BaFe12O19 |
title_fullStr |
Electrical conductivity and dielectric properties of Sr doped M-type barium hexaferrite BaFe12O19 |
title_full_unstemmed |
Electrical conductivity and dielectric properties of Sr doped M-type barium hexaferrite BaFe12O19 |
title_sort |
Electrical conductivity and dielectric properties of Sr doped M-type barium hexaferrite BaFe12O19 |
author |
Marouani, Y. |
author_facet |
Marouani, Y. Massoudi, J. Noumi, M. Benali, A. Dhahri, E. Sanguino, P. Graça, M. P. F. Valente, M. A. Costa, B. F. O. |
author_role |
author |
author2 |
Massoudi, J. Noumi, M. Benali, A. Dhahri, E. Sanguino, P. Graça, M. P. F. Valente, M. A. Costa, B. F. O. |
author2_role |
author author author author author author author author |
dc.contributor.author.fl_str_mv |
Marouani, Y. Massoudi, J. Noumi, M. Benali, A. Dhahri, E. Sanguino, P. Graça, M. P. F. Valente, M. A. Costa, B. F. O. |
description |
The Raman results showed that the intensity of the resonance band remains unchanged in Ba1 xSrxFe12O19 compared to the undoped compound (x ¼ 0) indicating that the polarizability did not change during the vibrations. The particle sizes, observed by TEM, are reduced from 228 nm to 176 nm with doping. Electrical conductance measurements show that all samples present semiconductor-like behaviors. The Maxwell–Wagner model explains why the alternating electrical conductivity of the samples doped with Sr is lower compared to that of the undoped sample. The Correlated Barrier Hopping (CBH) model dominates the conduction process for the BaFe12O19 sample, whereas the No overlapping Small Polaron Tunneling (NSPT) model dominates the conduction process for the Ba0.5Sr0.5- Fe12O19 sample. For SrFe12O19 the conduction is dominated by the NSPT model at temperatures below 240 K and by the CBH model above 240 K. The BaFe12O19 compound exhibits a giant dielectric constant (3 0) whose values reached 104 at low frequencies. This value is reduced to 150 in the Sr-doped hexaferrite. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-01-04 |
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.uri.fl_str_mv |
http://hdl.handle.net/10316/105438 http://hdl.handle.net/10316/105438 https://doi.org/10.1039/d0ra09465j |
url |
http://hdl.handle.net/10316/105438 https://doi.org/10.1039/d0ra09465j |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
35424123 2046-2069 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Royal Society of Chemistry |
publisher.none.fl_str_mv |
Royal Society of Chemistry |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799134110205083648 |