Structural and electrical properties of ZnO varistors containing different spinel phases

dc.contributor.authorBrankovic, Z.
dc.contributor.authorBrankovic, G.
dc.contributor.authorPoleti, D.
dc.contributor.authorVarela, José Arana [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversity of Belgrade
dc.date.accessioned2014-05-20T15:21:21Z
dc.date.available2014-05-20T15:21:21Z
dc.date.issued2001-01-01
dc.description.abstractStructural and electrical properties of ZnO varistors were investigated as a function of spinel composition. Six varistor mixtures differing only in chemical composition of spinel, were prepared by mixing separately synthesized constituent phases (DSCP method). Compositions of constituent phases in sintered samples were investigated by changes of lattice parameters of the phases, as well as by EDS analysis of the constituent phases. It was found that compositions of ZnO, intergranular and spinel phases were partially changed during sintering due to redistribution of additives, that was controlled by starting spinel composition and its stability. Electrical characterization showed significant difference in electrical properties of investigated varistors: nonlinearity coefficients ranging from 22 to 55 and leakage currents differing by the order of magnitude. Activation energies of conduction were obtained from ac impedance spectroscopy measurements. Calculated values of activation energies were in the range 0.61-1.0 eV confirming difference in defect structure of ZnO grain boundaries in varistors containing different spinel phases. (C) 2001 Elsevier B.V. Ltd and Techna S.r.l. All rights reserved.en
dc.description.affiliationUNESP, Inst Quim, BR-14800 Araraquara, SP, Brazil
dc.description.affiliationUniv Belgrade, Fac Technol & Met, Dept Gen & Inorgan Chem, YU-11001 Belgrade, Yugoslavia
dc.description.affiliationUnespUNESP, Inst Quim, BR-14800 Araraquara, SP, Brazil
dc.format.extent115-122
dc.identifierhttp://dx.doi.org/10.1016/S0272-8842(00)00051-1
dc.identifier.citationCeramics International. Oxford: Elsevier B.V., v. 27, n. 1, p. 115-122, 2001.
dc.identifier.doi10.1016/S0272-8842(00)00051-1
dc.identifier.issn0272-8842
dc.identifier.urihttp://hdl.handle.net/11449/32511
dc.identifier.wosWOS:000166552500017
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofCeramics International
dc.relation.ispartofjcr3.057
dc.relation.ispartofsjr0,784
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectX-ray methodpt
dc.subjectelectrical propertiespt
dc.subjectspinelspt
dc.subjectvaristorspt
dc.titleStructural and electrical properties of ZnO varistors containing different spinel phasesen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt
unesp.departmentFísico-Química - IQARpt

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