Cracks developed during SrTiO3 thin-film preparation from polymeric precursors

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dc.contributor.authorZanetti, S. M.
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.accessioned2014-05-20T15:22:59Z
dc.date.available2014-05-20T15:22:59Z
dc.date.issued1999-05-01
dc.description.abstractStrontium titanate (SrTiO3) thin films were prepared by dip-coating Si(111) single-crystal substrates in citrate solutions of ethylene glycol, considering several citric acid/ethylene glycol (CA/EG) ratios. Measurements of intrinsic viscosity indicate that increasing the amount of EG increases the precursors' polymeric chains and increases the weight loss. After deposition the substrates were dried on a hotplate (approximate to 150 degrees C); this was followed by heat treatment at temperatures ranging from 500 to 700 degrees C using heating and cooling rates of 1 degrees C min(-1). SEM and optical microscopy investigations of the sintered films obtained from different CA/EG ratios indicate that there is a critical thickness above which the films present cracks. This critical thickness for SrTiO3 films deposited on the Si(111) substrate is about 150 nm, Measurements of crack spacing as a function of film thickness indicate that the origin of cracks cannot be explained by the elastic behavior of the film but rather by the viscoelastic relaxation of the film during pyrolysis and sintering. Copyright (C) 1999 John Wiley & Sons, Ltd.en
dc.description.affiliationUniv Fed Sao Carlos, Dept Quim, BR-13560 Sao Carlos, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Inst Quim, BR-14800 Araraquara, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Quim, BR-14800 Araraquara, SP, Brazil
dc.format.extent373-382
dc.identifierhttp://dx.doi.org/10.1002/(SICI)1099-0739(199905)13:5<373
dc.identifier.citationApplied Organometallic Chemistry. W Sussex: John Wiley & Sons Ltd, v. 13, n. 5, p. 373-382, 1999.
dc.identifier.doi10.1002/(SICI)1099-0739(199905)13:5<373
dc.identifier.issn0268-2605
dc.identifier.urihttp://hdl.handle.net/11449/33858
dc.identifier.wosWOS:000080425300005
dc.language.isoeng
dc.publisherWiley-Blackwell
dc.relation.ispartofApplied Organometallic Chemistry
dc.relation.ispartofjcr3.581
dc.relation.ispartofsjr0,586
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectsol gel processpt
dc.subjectthin filmspt
dc.subjectstrontium titanatept
dc.subjectcrackingpt
dc.subjectethylene glycolpt
dc.subjectcitric acidpt
dc.titleCracks developed during SrTiO3 thin-film preparation from polymeric precursorsen
dc.typeArtigo
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dcterms.rightsHolderWiley-Blackwell
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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