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Publicação:
Effect of oxidizing and reducing atmospheres on the electrical properties of dense SnO2-based varistors

dc.contributor.authorSantos, MRC
dc.contributor.authorBueno, Paulo Roberto [UNESP]
dc.contributor.authorLongo, Elson [UNESP]
dc.contributor.authorVarela, José Arana [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.date.accessioned2014-05-20T15:21:21Z
dc.date.available2014-05-20T15:21:21Z
dc.date.issued2001-02-01
dc.description.abstractThe SnO2 based varistor systems recently presented in the literature appear to have a promising potential in commercial applications. Experimental evidence shows that there is a dependence of nonlinear constant values with thermal treatment under different atmospheres. Thermal treatments in oxygen and nitrogen rich atmospheres at 900 degreesC prove this dependence, indicating that the nonlinear constant values are significantly lower when the material is submitted to a nitrogen atmosphere. Moreover, electrical properties can be restored when the varistor is subjected to thermal treatment at the same temperature in an oxygen atmosphere, indicating that the mechanism seems to be reversible. This paper discusses this behavior focusing in the grain boundary region. Ta2O5 mol% concentrations are also analyzed and the results indicate an optimum Ta2O5 concentration of 0.05 mol% for the electrical properties (alpha = 44 and E-B = 6150 V cm(-1)). (C) 2001 Elsevier B.V. Ltd. All rights reserved.en
dc.description.affiliationUNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationUFSCar, Dept Quim, LIEC, BR-13565905 Sao Carlos, SP, Brazil
dc.description.affiliationUnespUNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil
dc.format.extent161-167
dc.identifierhttp://dx.doi.org/10.1016/S0955-2219(00)00177-1
dc.identifier.citationJournal of the European Ceramic Society. Oxford: Elsevier B.V., v. 21, n. 2, p. 161-167, 2001.
dc.identifier.doi10.1016/S0955-2219(00)00177-1
dc.identifier.issn0955-2219
dc.identifier.lattes0477045906733254
dc.identifier.orcid0000-0003-2827-0208
dc.identifier.urihttp://hdl.handle.net/11449/32510
dc.identifier.wosWOS:000166551300008
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal of the European Ceramic Society
dc.relation.ispartofjcr3.794
dc.relation.ispartofsjr1,068
dc.rights.accessRightsAcesso restritopt
dc.sourceWeb of Science
dc.subjectelectrical propertiespt
dc.subjectgrain boundariespt
dc.subjectSnO2pt
dc.subjectTa2O5pt
dc.subjectvaristorspt
dc.titleEffect of oxidizing and reducing atmospheres on the electrical properties of dense SnO2-based varistorsen
dc.typeArtigopt
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
dspace.entity.typePublication
relation.isOrgUnitOfPublicationbc74a1ce-4c4c-4dad-8378-83962d76c4fd
relation.isOrgUnitOfPublication.latestForDiscoverybc74a1ce-4c4c-4dad-8378-83962d76c4fd
unesp.author.lattes0477045906733254[2]
unesp.author.orcid0000-0003-2827-0208[2]
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Química, Araraquarapt
unesp.departmentBioquímica e Tecnologia - IQARpt
unesp.departmentFísico-Química - IQARpt

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