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dc.contributor.authorMasteghin, Mateus Gallucci [UNESP]
dc.contributor.authorOrlandi, Marcelo Ornaghi [UNESP]
dc.date.accessioned2018-11-28T02:03:08Z
dc.date.available2018-11-28T02:03:08Z
dc.date.issued2016-11-01
dc.identifierhttp://dx.doi.org/10.1590/1980-5373-MR-2016-0210
dc.identifier.citationMaterials Research-ibero-american Journal Of Materials. Sao Carlos: Univ Fed Sao Carlos, Dept Engenharia Materials, v. 19, n. 6, p. 1286-1291, 2016.
dc.identifier.issn1516-1439
dc.identifier.urihttp://hdl.handle.net/11449/165427
dc.description.abstractThis work has focused on the electrical and microstructural properties of Nb2O5-doped SnO2-MnO2 ceramics. The pellets were prepared by solid-state reaction method according to the system (99.5-x) SnO2 - 0.5 MnO2 - (x) Nb2O5, on the following molar ratio x = 0.05; 0.10; 0.15; 0.20 and 0.25. Scanning electron microscopy and electrical measurements (ac and dc) were used to study the materials properties. The results showed that the increase of Nb2O5 content in the SnO2-MnO2 matrix has led to an increase in the varistor properties. A detailed study of the electrical properties of materials was conducted using impedance spectroscopy and the results indicated that Nb2O5 has a tendency to form an electron trapping level near the conduction band. In order to explain these findings, a parallel equivalent circuit model was used to simulate the values of the grain boundary resistance. A close relationship was found between the value of the nonlinear coefficient and the grain boundary resistance for the studied varistors, where both values increased with increasing the amount of Nb2O5, which is important for practical applications.en
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent1286-1291
dc.language.isoeng
dc.publisherUniv Fed Sao Carlos, Dept Engenharia Materials
dc.relation.ispartofMaterials Research-ibero-american Journal Of Materials
dc.sourceWeb of Science
dc.subjectVaristor
dc.subjectTin oxide
dc.subjectElectrical properties
dc.subjectImpedance spectroscopy
dc.titleGrain-Boundary Resistance and Nonlinear Coefficient Correlation for SnO2-Based Varistorsen
dc.typeArtigo
dcterms.rightsHolderUniv Fed Sao Carlos, Dept Engenharia Materials
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.description.affiliationSao Paulo State Univ, Inst Chem, Araraquara, SP, Brazil
dc.description.affiliationUnespSao Paulo State Univ, Inst Chem, Araraquara, SP, Brazil
dc.identifier.doi10.1590/1980-5373-MR-2016-0210
dc.identifier.scieloS1516-14392016000601286
dc.identifier.wosWOS:000391716900008
dc.rights.accessRightsAcesso aberto
dc.description.sponsorshipIdFAPESP: 2013/07296-2
dc.description.sponsorshipIdCNPq: 402297/2013-0
dc.description.sponsorshipIdCNPq: 447760/2014-9
dc.description.sponsorshipIdCNPq: 800733/2014-2
dc.description.sponsorshipIdCNPq: 303542/2015-2
dc.identifier.fileS1516-14392016000601286.pdf
dc.identifier.lattes2305581567093057
unesp.author.lattes2305581567093057
dc.relation.ispartofsjr0,398
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