Grain-boundary segregation and precipitates in La2O3 and Pr2O3 doped SnO2 center dot CoO-based varistors

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dc.contributor.authorOliveira, M. M.
dc.contributor.authorSoares, P. C.
dc.contributor.authorBueno, Paulo Roberto [UNESP]
dc.contributor.authorLeite, E. R.
dc.contributor.authorLongo, Elson [UNESP]
dc.contributor.authorVarela, José Arana [UNESP]
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:20:42Z
dc.date.available2014-05-20T15:20:42Z
dc.date.issued2003-10-01
dc.description.abstractStructural heterogeneities in SnO2.CoO-based varistors were analyzed by transmission electron microscopy. In SnO2.CoO-based system doped with La2O3 and Pr2O3 two kinds of precipitate phases at grain boundary region were found. Using energy dispersive spectrometry they were found to be Co2SnO4 and Pr2Sn2O7, presenting a defined crystalline structure. It was also identified that such precipitate phases are mainly located in triple-junctions of the microstructure. HRTEM analysis revealed the existence of other two types of junctions, one as being homo-junctions of SnO2 grains and other due to twin grain boundaries inside the SnO2.CoO grain. The role of these types of junction in the overall nonlinear electrical features is also discussed. (C) 2003 Elsevier B.V. Ltd. All rights reserved.en
dc.description.affiliationUniv Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP, Brazil
dc.description.affiliationUniv Fed Sao Carlos, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Inst Quim, BR-14801907 Araraquara, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Quim, BR-14801907 Araraquara, SP, Brazil
dc.format.extent1875-1880
dc.identifierhttp://dx.doi.org/10.1016/S0955-2219(02)00445-4
dc.identifier.citationJournal of the European Ceramic Society. Oxford: Elsevier B.V., v. 23, n. 11, p. 1875-1880, 2003.
dc.identifier.doi10.1016/S0955-2219(02)00445-4
dc.identifier.issn0955-2219
dc.identifier.lattes0477045906733254
dc.identifier.orcid0000-0003-2827-0208
dc.identifier.urihttp://hdl.handle.net/11449/31947
dc.identifier.wosWOS:000184035500013
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 restrito
dc.sourceWeb of Science
dc.subjectCoOpt
dc.subjectgrain boundariespt
dc.subjectmicrostructure-finalpt
dc.subjectSnO2pt
dc.subjectvaristorspt
dc.titleGrain-boundary segregation and precipitates in La2O3 and Pr2O3 doped SnO2 center dot CoO-based varistorsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes0477045906733254[3]
unesp.author.orcid0000-0003-2827-0208[3]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt
unesp.departmentBioquímica e Tecnologia - IQARpt
unesp.departmentFísico-Química - IQARpt

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Araraquara - IQAR - Instituto de Química