Oxygen diffusion in superconducting oxides

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dc.contributor.authorGrandini, Carlos Roberto [UNESP]
dc.contributor.authorde Albuquerque Gimenez, Juliana Maria [UNESP]
dc.contributor.authorda Silva, Marcos Ribeiro [UNESP]
dc.contributor.authordo Nascimento, Rodney Marcelo [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:26:23Z
dc.date.available2014-05-20T13:26:23Z
dc.date.issued2008-01-01
dc.description.abstractSince the discovery of high-temperature superconductivity of cuprate oxides, it has been clear that it is strongly affected by the oxygen content, which is also a crucial factor to determine other physical properties of high T-c superconductors. Non-stoichiometric (interstitial) oxygen strongly influences the physical properties of various superconducting oxides, in particular by creating conducting holes. It is now ascertained that the amount of holes injected depends not only on the content of interstitial oxygen, but also on its ordering. Rearrangement of the oxygen ordering may occur even below room temperature due to the unusual high mobility of these atoms. This way, mechanical spectroscopy is one of the most adequate techniques for the study of the mobility (diffusion) of oxygen atoms. This technique allows the determination of the jump frequency of an atomic species precisely, regardless of the model or the different possible types of jumps. In order to evaluate the mobility and the effect of oxygen content on these oxides, ceramic samples we prepared and submitted to several oxygen removal cycles alternately with mechanical relaxation measurements. As for SBCO, it was assumed that the peak was due to O(1)-O(5) jumps of oxygen atoms at the chain terminals or in chain fragments in the orthorhombic phase. In the case of BSCCO, the results showed complex anelastic relaxation structures, which were attributed to interstitial oxygen atom jumps between two adjacent CuO planes.en
dc.description.affiliationUNESP, Grp Relaxacoes Anelast, BR-17033360 Bauru, SP, Brazil
dc.description.affiliationUnespUNESP, Grp Relaxacoes Anelast, BR-17033360 Bauru, SP, Brazil
dc.format.extent266-270
dc.identifierhttp://dx.doi.org/10.4028/www.scientific.net/DDF.273-276.266
dc.identifier.citationDiffusion In Solids and Liquids Iii. Stafa-zurich: Trans Tech Publications Ltd, v. 273-276, p. 266-270, 2008.
dc.identifier.doi10.4028/www.scientific.net/DDF.273-276.266
dc.identifier.issn1012-0386
dc.identifier.lattes2949983867418338
dc.identifier.orcid0000-0002-3336-309X
dc.identifier.urihttp://hdl.handle.net/11449/8499
dc.identifier.wosWOS:000254387700046
dc.language.isoeng
dc.publisherTrans Tech Publications Ltd
dc.relation.ispartofDiffusion In Solids and Liquids Iii
dc.relation.ispartofsjr0,129
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectdiffusionen
dc.subjectsuperconducting oxidesen
dc.subjectinterstitial oxygenen
dc.titleOxygen diffusion in superconducting oxidesen
dc.typeTrabalho apresentado em evento
dcterms.licensehttp://www.ttp.net/Downloads.html
dcterms.rightsHolderTrans Tech Publications Ltd
unesp.author.lattes2949983867418338[1]
unesp.author.orcid0000-0002-3336-309X[1]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências, Baurupt
unesp.departmentFísica - FCpt

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