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hal.structure.identifierInstitute of Physics
dc.contributor.authorNUZHNYY, Dmitry
hal.structure.identifierInstitute of Physics
dc.contributor.authorPETZELT, Jan
hal.structure.identifierInstitute of Physics
dc.contributor.authorBOVTUN, Viktor
hal.structure.identifierInstitute of Physics
dc.contributor.authorKEMPA, Martin
hal.structure.identifierInstitute of Physics
dc.contributor.authorSAVINOV, Maxim
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorELISSALDE, Catherine
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCHUNG SEU, U-Chan
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMICHAU, Dominique
hal.structure.identifierCentre interuniversitaire de recherche et d'ingénierie des matériaux [CIRIMAT]
dc.contributor.authorESTOURNÈS, Claude
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMAGLIONE, Mario
dc.date.issued2011
dc.description.abstractEnThree types of BaTiO<sub>3</sub> core -- amorphous nanoshell composite ceramics were processed from the same core-shell powder by standard sintering, spark-plasma sintering and two-step sintering techniques and characterized by XRD, HRSEM and broadband dielectric spectroscopy in the frequency range 10<sup>3</sup> - 10<sup>13</sup> Hz including the THz and IR range. The samples differed by porosity and by the amount of interdiffusion from the cores to shells, in correlation with their increasing porosity. The dielectric spectra were also calculated using suitable models based on effective medium approximation. The measurements revealed a strong dielectric dispersion below the THz range, which cannot be explained by the modeling, and whose strength was in correlation with the degree of interdiffusion. It is assigned to an effect of the interdiffusion layers, giving rise to a strong interfacial polarization. It appears that the high-frequency dielectric spectroscopy is an extremely sensitive tool for detection of any gradient layers and sample inhomogeneities even in dielectric materials with negligible conductivity.
dc.language.isoen
dc.subject.enCore-shell nanocomposites
dc.subject.enInfrared and THz spectroscopy
dc.subject.enBarium titanate
dc.subject.enEffective medium approximation
dc.title.enHigh-frequency dielectric spectroscopy of BaTiO<sub>3</sub> core--silica shell nanocomposites : problem of interdiffusion
dc.typeArticle de revue
dc.identifier.doi10.1142/S2010135X11000367
dc.subject.halChimie/Matériaux
dc.identifier.arxiv1111.3738
bordeaux.journalJournal of Advanced Dielectrics
bordeaux.page309-317
bordeaux.volume1
bordeaux.issue3
bordeaux.peerReviewedoui
hal.identifierhal-00618436
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00618436v1
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