Dielectric Behavior of α-Ag2WO4 and its Huge Dielectric Loss Tangent
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Materials research (São Carlos. Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392019000400227 |
Resumo: | The microwave-assisted hydrothermal method was used to obtain α-Ag2WO4. Rietveld refinement confirmed that α-Ag2WO4 is stable in the orthorhombic phase, without secondary phase. However, field-effect scanning electron microscope analysis showed that α-Ag2WO4 nanorods surfaces contain silver nanoparticles, confirmed by the X-ray photoelectron spectroscopy by the peak observed at 374.39 eV. In addition to metallic Ag, other Ag oxidation states were also observed on the surface. Hence, Ag (I) as Ag2O and Ag (I) as Ag2WO4 also were identified. DC measurements exhibited a high capacity of charge storage, nevertheless, with a large loss tangent (0.12 µC.cm-2.V-1) and no residual polarization for the voltage range between -100 V and +100 V. AC measurements at frequencies less than 275 Hz, revealed that ionic polarization is dominant, whereas at frequencies higher than 275 Hz, the electronic behavior predominates. The potential of electromagnetic energy conversion in thermal was observed from loss tangent analysis. |
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Dielectric Behavior of α-Ag2WO4 and its Huge Dielectric Loss Tangentsilver tungstate nanorodsdielectric behaviorionic and electronic polarizationThe microwave-assisted hydrothermal method was used to obtain α-Ag2WO4. Rietveld refinement confirmed that α-Ag2WO4 is stable in the orthorhombic phase, without secondary phase. However, field-effect scanning electron microscope analysis showed that α-Ag2WO4 nanorods surfaces contain silver nanoparticles, confirmed by the X-ray photoelectron spectroscopy by the peak observed at 374.39 eV. In addition to metallic Ag, other Ag oxidation states were also observed on the surface. Hence, Ag (I) as Ag2O and Ag (I) as Ag2WO4 also were identified. DC measurements exhibited a high capacity of charge storage, nevertheless, with a large loss tangent (0.12 µC.cm-2.V-1) and no residual polarization for the voltage range between -100 V and +100 V. AC measurements at frequencies less than 275 Hz, revealed that ionic polarization is dominant, whereas at frequencies higher than 275 Hz, the electronic behavior predominates. The potential of electromagnetic energy conversion in thermal was observed from loss tangent analysis.ABM, ABC, ABPol2019-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392019000400227Materials Research v.22 n.4 2019reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/1980-5373-mr-2019-0058info:eu-repo/semantics/openAccessJacomaci,NataliaSilva Junior,EuripedesOliveira,Fernando Modesto Borges deLongo,ElsonZaghete,Maria Aparecidaeng2019-08-30T00:00:00Zoai:scielo:S1516-14392019000400227Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2019-08-30T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.none.fl_str_mv |
Dielectric Behavior of α-Ag2WO4 and its Huge Dielectric Loss Tangent |
title |
Dielectric Behavior of α-Ag2WO4 and its Huge Dielectric Loss Tangent |
spellingShingle |
Dielectric Behavior of α-Ag2WO4 and its Huge Dielectric Loss Tangent Jacomaci,Natalia silver tungstate nanorods dielectric behavior ionic and electronic polarization |
title_short |
Dielectric Behavior of α-Ag2WO4 and its Huge Dielectric Loss Tangent |
title_full |
Dielectric Behavior of α-Ag2WO4 and its Huge Dielectric Loss Tangent |
title_fullStr |
Dielectric Behavior of α-Ag2WO4 and its Huge Dielectric Loss Tangent |
title_full_unstemmed |
Dielectric Behavior of α-Ag2WO4 and its Huge Dielectric Loss Tangent |
title_sort |
Dielectric Behavior of α-Ag2WO4 and its Huge Dielectric Loss Tangent |
author |
Jacomaci,Natalia |
author_facet |
Jacomaci,Natalia Silva Junior,Euripedes Oliveira,Fernando Modesto Borges de Longo,Elson Zaghete,Maria Aparecida |
author_role |
author |
author2 |
Silva Junior,Euripedes Oliveira,Fernando Modesto Borges de Longo,Elson Zaghete,Maria Aparecida |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Jacomaci,Natalia Silva Junior,Euripedes Oliveira,Fernando Modesto Borges de Longo,Elson Zaghete,Maria Aparecida |
dc.subject.por.fl_str_mv |
silver tungstate nanorods dielectric behavior ionic and electronic polarization |
topic |
silver tungstate nanorods dielectric behavior ionic and electronic polarization |
description |
The microwave-assisted hydrothermal method was used to obtain α-Ag2WO4. Rietveld refinement confirmed that α-Ag2WO4 is stable in the orthorhombic phase, without secondary phase. However, field-effect scanning electron microscope analysis showed that α-Ag2WO4 nanorods surfaces contain silver nanoparticles, confirmed by the X-ray photoelectron spectroscopy by the peak observed at 374.39 eV. In addition to metallic Ag, other Ag oxidation states were also observed on the surface. Hence, Ag (I) as Ag2O and Ag (I) as Ag2WO4 also were identified. DC measurements exhibited a high capacity of charge storage, nevertheless, with a large loss tangent (0.12 µC.cm-2.V-1) and no residual polarization for the voltage range between -100 V and +100 V. AC measurements at frequencies less than 275 Hz, revealed that ionic polarization is dominant, whereas at frequencies higher than 275 Hz, the electronic behavior predominates. The potential of electromagnetic energy conversion in thermal was observed from loss tangent analysis. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392019000400227 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392019000400227 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/1980-5373-mr-2019-0058 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
ABM, ABC, ABPol |
publisher.none.fl_str_mv |
ABM, ABC, ABPol |
dc.source.none.fl_str_mv |
Materials Research v.22 n.4 2019 reponame:Materials research (São Carlos. Online) instname:Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL |
instname_str |
Universidade Federal de São Carlos (UFSCAR) |
instacron_str |
ABM ABC ABPOL |
institution |
ABM ABC ABPOL |
reponame_str |
Materials research (São Carlos. Online) |
collection |
Materials research (São Carlos. Online) |
repository.name.fl_str_mv |
Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR) |
repository.mail.fl_str_mv |
dedz@power.ufscar.br |
_version_ |
1754212674937290752 |