High-frequency dielectric spectroscopy of BaTiO<sub>3</sub> core--silica shell nanocomposites : problem of interdiffusion
hal.structure.identifier | Institute of Physics | |
dc.contributor.author | NUZHNYY, Dmitry | |
hal.structure.identifier | Institute of Physics | |
dc.contributor.author | PETZELT, Jan | |
hal.structure.identifier | Institute of Physics | |
dc.contributor.author | BOVTUN, Viktor | |
hal.structure.identifier | Institute of Physics | |
dc.contributor.author | KEMPA, Martin | |
hal.structure.identifier | Institute of Physics | |
dc.contributor.author | SAVINOV, Maxim | |
hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
dc.contributor.author | ELISSALDE, Catherine | |
hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
dc.contributor.author | CHUNG SEU, U-Chan | |
hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
dc.contributor.author | MICHAU, Dominique | |
hal.structure.identifier | Centre interuniversitaire de recherche et d'ingénierie des matériaux [CIRIMAT] | |
dc.contributor.author | ESTOURNÈS, Claude | |
hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
dc.contributor.author | MAGLIONE, Mario | |
dc.date.issued | 2011 | |
dc.description.abstractEn | Three 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.iso | en | |
dc.subject.en | Core-shell nanocomposites | |
dc.subject.en | Infrared and THz spectroscopy | |
dc.subject.en | Barium titanate | |
dc.subject.en | Effective medium approximation | |
dc.title.en | High-frequency dielectric spectroscopy of BaTiO<sub>3</sub> core--silica shell nanocomposites : problem of interdiffusion | |
dc.type | Article de revue | |
dc.identifier.doi | 10.1142/S2010135X11000367 | |
dc.subject.hal | Chimie/Matériaux | |
dc.identifier.arxiv | 1111.3738 | |
bordeaux.journal | Journal of Advanced Dielectrics | |
bordeaux.page | 309-317 | |
bordeaux.volume | 1 | |
bordeaux.issue | 3 | |
bordeaux.peerReviewed | oui | |
hal.identifier | hal-00618436 | |
hal.version | 1 | |
hal.popular | non | |
hal.audience | Internationale | |
hal.origin.link | https://hal.archives-ouvertes.fr//hal-00618436v1 | |
bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Advanced%20Dielectrics&rft.date=2011&rft.volume=1&rft.issue=3&rft.spage=309-317&rft.epage=309-317&rft.au=NUZHNYY,%20Dmitry&PETZELT,%20Jan&BOVTUN,%20Viktor&KEMPA,%20Martin&SAVINOV,%20Maxim&rft.genre=article |
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