Dielectric Behavior of alpha-Ag2WO4 and its Huge Dielectric Loss Tangent

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dc.contributor.authorJacomaci, Natalia [UNESP]
dc.contributor.authorSilva Junior, Euripedes [UNESP]
dc.contributor.authorBorges de Oliveira, Fernando Modesto
dc.contributor.authorLongo, Elson
dc.contributor.authorZaghete, Maria Aparecida [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.date.accessioned2019-10-04T12:15:58Z
dc.date.available2019-10-04T12:15:58Z
dc.date.issued2019-01-01
dc.description.abstractThe microwave-assisted hydrothermal method was used to obtain alpha-Ag2WO4. Rietveld refinement confirmed that alpha-Ag2WO4 is stable in the orthorhombic phase, without secondary phase. However, field-effect scanning electron microscope analysis showed that alpha-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 Ag(2)WO(4 )also were identified. DC measurements exhibited a high capacity of charge storage, nevertheless, with a large loss tangent (0.12 mu C.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.en
dc.description.affiliationUniv Estadual Paulista, UNESP, Inst Quim, BR-14800060 Araraquara, SP, Brazil
dc.description.affiliationUniv Fed Sao Carlos UFSCar, Dept Quim, BR-13565905 Sao Carlos, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, UNESP, Inst Quim, BR-14800060 Araraquara, SP, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdFAPESP: 2013/07296-2
dc.format.extent10
dc.identifierhttp://dx.doi.org/10.1590/1980-5373-MR-2019-0058
dc.identifier.citationMaterials Research-ibero-american Journal Of Materials. Sao Carlos: Univ Fed Sao Carlos, Dept Engenharia Materials, v. 22, n. 4, 10 p., 2019.
dc.identifier.doi10.1590/1980-5373-MR-2019-0058
dc.identifier.fileS1516-14392019000400227.pdf
dc.identifier.issn1516-1439
dc.identifier.scieloS1516-14392019000400227
dc.identifier.urihttp://hdl.handle.net/11449/184691
dc.identifier.wosWOS:000484187700001
dc.language.isoeng
dc.publisherUniv Fed Sao Carlos, Dept Engenharia Materials
dc.relation.ispartofMaterials Research-ibero-american Journal Of Materials
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectSilver tungstate nanorods
dc.subjectdielectric behavior
dc.subjectionic and electronic polarization
dc.titleDielectric Behavior of alpha-Ag2WO4 and its Huge Dielectric Loss Tangenten
dc.typeArtigo
dcterms.rightsHolderUniv Fed Sao Carlos, Dept Engenharia Materials

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