Thermistor behaviour and electric conduction analysis of Ni-doped niobate ferroelectric: the role of multiple beta parameters

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dc.contributor.authorLanfredi, Silvania [UNESP]
dc.contributor.authorPalacio, Gustavo [UNESP]
dc.contributor.authorBellucci, Felipe S. [UNESP]
dc.contributor.authorColin, Claire V.
dc.contributor.authorNobre, Marcos Augusto Lima [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionCNRS
dc.contributor.institutionUniv Grenoble 1
dc.date.accessioned2014-05-20T15:32:21Z
dc.date.available2014-05-20T15:32:21Z
dc.date.issued2012-10-31
dc.description.abstractA new engineered non-stoichiometric niobate ceramic with a tetragonal tungsten bronze (TTB)-type structure is prepared by non-isovalent substitution at the niobium backbone. The compound's formula is KSr2(Ni0.75Nb4.25)O-15 (delta), with space group equal to P4bm (#100), a polar group. Electrical properties of this new ferroelectric-semiconductor ceramic are investigated by impedance spectroscopy in the temperature range from 453 up to 953 K. The curve of the resistance as a function of temperature presents further characteristics of a temperature sensor with a negative temperature coefficient (NTC). At high temperatures, the analysis of electrical parameters shows an NTC behaviour ceramic with three distinct thermistor characteristic parameters, beta. The values of the beta parameter change from 9.82 x 10(3) to 1.29 x 10(4) K, while the temperature coefficient of resistance a changes from -0.047 to -0.023K(-1). The NTC behaviour of KSr2(Ni0.75Nb4.25)O15-delta is compared with the behaviour of some dielectric and other ferroelectric semiconductors. beta dependence with dc or the ac conductivity mechanism and its correlation with beta quality are discussed.en
dc.description.affiliationUniv Estadual Paulista UNESP, FCT, BR-19060900 Presidente Prudente, SP, Brazil
dc.description.affiliationUniv Estadual Paulista UNESP, Inst Biociencias Letras & Ciencias Exatas, Sao Jose do Rio Preto, SP, Brazil
dc.description.affiliationUniv Estadual Paulista UNESP, Fac Ciencias FC, BR-17033360 Bauru, SP, Brazil
dc.description.affiliationCNRS, Inst Neel, F-38042 Grenoble 9, France
dc.description.affiliationUniv Grenoble 1, F-38042 Grenoble 9, France
dc.description.affiliationUnespUniv Estadual Paulista UNESP, FCT, BR-19060900 Presidente Prudente, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista UNESP, Inst Biociencias Letras & Ciencias Exatas, Sao Jose do Rio Preto, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista UNESP, Fac Ciencias FC, BR-17033360 Bauru, SP, Brazil
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipFundação para o Desenvolvimento da UNESP (FUNDUNESP)
dc.description.sponsorshipIdCNPq: 308924//2009-6
dc.description.sponsorshipIdCNPq: 472773/2009-7
dc.description.sponsorshipIdFAPESP: 2001/13421-7
dc.description.sponsorshipIdFAPESP: 2002/05997-9
dc.description.sponsorshipIdFAPESP: 2007/03510-9
dc.format.extent13
dc.identifierhttp://dx.doi.org/10.1088/0022-3727/45/43/435302
dc.identifier.citationJournal of Physics D-applied Physics. Bristol: Iop Publishing Ltd, v. 45, n. 43, p. 13, 2012.
dc.identifier.doi10.1088/0022-3727/45/43/435302
dc.identifier.issn0022-3727
dc.identifier.lattes7201928600704530
dc.identifier.orcid0000-0003-4843-3975
dc.identifier.urihttp://hdl.handle.net/11449/41276
dc.identifier.wosWOS:000310442700011
dc.language.isoeng
dc.publisherIop Publishing Ltd
dc.relation.ispartofJournal of Physics D: Applied Physics
dc.relation.ispartofjcr2.373
dc.relation.ispartofsjr0,717
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleThermistor behaviour and electric conduction analysis of Ni-doped niobate ferroelectric: the role of multiple beta parametersen
dc.typeArtigo
dcterms.licensehttp://iopscience.iop.org/page/copyright
dcterms.rightsHolderIop Publishing Ltd
unesp.author.lattes7201928600704530
unesp.author.orcid0000-0003-4843-3975[5]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências e Tecnologia, Presidente Prudentept
unesp.departmentFísica, Química e Biologia - FCTpt

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