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dc.contributor.authorPardo, Lorena-
dc.contributor.authorGarcía, Álvaro-
dc.contributor.authorBrebøl, Klaus-
dc.contributor.authorMercadelli, Elisa-
dc.contributor.authorGalassi, Carmen-
dc.date.accessioned2011-10-07T12:19:24Z-
dc.date.available2011-10-07T12:19:24Z-
dc.date.issued2011-10-07-
dc.identifier.issn0022-3727-
dc.identifier.urihttp://hdl.handle.net/10261/40791-
dc.descriptionCSIC project #201060E069 and supported by the European Network of Excellence (NoE-MIND CE FP6 515757-2)es_ES
dc.description.abstractSubmicron structured (grain size≈500nm), dense (Bi0.5Na0.5)0.96Ba0.04TiO3 ceramics were obtained from sol-gel autocombustion nanopowders by hot-pressing (700-950⁰C) and subsequent recrystallization (1000-1050⁰C). Electromechanical coefficients were obtained by analysis of the resonance spectra of thin disks using Alemany et al. software. The real part of the room temperature set of coefficients of the best performing materials (εσ33=(416 –16 i), d31= (-22.68 + 0.55 i)pC/N-1, kt= 44.5%, kp=21.1% ) can be compared with those of coarse-grained ceramics and d33 (95 pC.N-1) is higher. Shear related coefficients were obtained from thickness poled and length excited plates (εσ11= (402 –89i), d15=(108.3 – 21.4 i) pC.N-1 and k15=39.2%). At the depolarization temperature, Td=153⁰C, the dielectric loss, tanδ(T), of poled samples shows a maximum and the planar resonance virtually vanishes. Shear resonance of thickness-poled plates and weak planar electromechanical resonance are observed above Td. The relaxor behaviour extends up to the isotropization point, Ti=238⁰C. This can be understood as due to the coexistence of the room temperature ferroelectric phase in the stability range of the low temperature non-polar phase at zero field, between Td and Ti.es_ES
dc.language.isoenges_ES
dc.rightsopenAccesses_ES
dc.subjectPiezoelectricityes_ES
dc.subjectPiezoelectricidades_ES
dc.subjectDielectrices_ES
dc.subjectPermitivityes_ES
dc.subjectPermitividades_ES
dc.subjectDieléctricaes_ES
dc.subjectSodiumes_ES
dc.subjectSodioes_ES
dc.subjectBariumes_ES
dc.subjectBarioes_ES
dc.subjectBismutoes_ES
dc.subjectBismuthes_ES
dc.subjectTitanatees_ES
dc.subjectTitanatoes_ES
dc.subjectLead-Freees_ES
dc.subjectVerdees_ES
dc.subjectCeramices_ES
dc.subjectCerámicaes_ES
dc.subjectResonancees_ES
dc.subjectResonanciaes_ES
dc.subjectPhasees_ES
dc.subjectTransitiones_ES
dc.subjectTransiciónes_ES
dc.subjectThermales_ES
dc.subjectDepolinges_ES
dc.subjectDespolarizaciónes_ES
dc.titleEnhanced properties for ultrasonic transduction, phase transitions and thermal depoling in 0.96(Bi0.5Na0.5)TiO3-0.04BaTiO3 submicron structured ceramices_ES
dc.typeartículoes_ES
dc.description.peerreviewedPeer reviewedes_ES
dc.relation.publisherversionhttp://iopscience.iop.org/0022-3727/44/33/335404es_ES
dc.type.coarhttp://purl.org/coar/resource_type/c_6501es_ES
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.openairetypeartículo-
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