Nature of potential barrier in (Ca-1/4,Cu-3/4)TiO3 polycrystalline perovskite

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorMarques, VPB
dc.creatorBueno, Paulo Roberto
dc.creatorSimoes, A. Z.
dc.creatorCilense, M.
dc.creatorVarela, José Arana
dc.creatorLongo, Elson
dc.creatorLeite, E. R.
dc.date2014-05-20T14:18:07Z
dc.date2016-10-25T17:40:22Z
dc.date2014-05-20T14:18:07Z
dc.date2016-10-25T17:40:22Z
dc.date2006-01-01
dc.date.accessioned2017-04-05T22:27:17Z
dc.date.available2017-04-05T22:27:17Z
dc.identifierSolid State Communications. Oxford: Pergamon-Elsevier B.V., v. 138, n. 1, p. 1-4, 2006.
dc.identifier0038-1098
dc.identifierhttp://hdl.handle.net/11449/25463
dc.identifierhttp://acervodigital.unesp.br/handle/11449/25463
dc.identifier10.1016/j.ssc.2006.02.001
dc.identifierWOS:000236570300001
dc.identifierhttp://dx.doi.org/10.1016/j.ssc.2006.02.001
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/870344
dc.descriptionThe nonohmic electrical features of (Ca-1/4,Cu-3/4)TiO3 perovskite ceramics, which have very strong gigantic dielectric is believed originate from potential barriers at the grain boundaries. In the present study, we used the admittance and impedance spectroscopy technique to investigate (Ca-1/4,Cu-3/4)TiO3 perovskite ceramics with low nonohmic electrical properties. The study was conducted under two different conditions: on as-sintered ceramics and on ceramics thermally treated in an oxygen-rich atmosphere. The results confirm that thermal treatment in oxygen-rich atmospheres influence the nonohmic properties. Annealing at oxygen-rich atmospheres improve the nonohmic behavior and annealing at oxygen-poor atmospheres decrease the nonohmic properties, a behavior already reported for common metal oxide nonohmic devices and here firstly evidenced for the (Ca-1/4,Cu-3/4)TiO3 perovskite related materials. The results show that oxygen also influences the capacitance values at low frequencies, a behavior that is indicative of the Schottky-type nature of the potential barrier. (c) 2006 Elsevier Ltd. All rights reserved.
dc.languageeng
dc.publisherElsevier B.V.
dc.relationSolid State Communications
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectperovskite
dc.subjectnonohmic devices
dc.subjectdieletric devices
dc.subjectvaristor
dc.titleNature of potential barrier in (Ca-1/4,Cu-3/4)TiO3 polycrystalline perovskite
dc.typeOtro


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