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Colossal dielectric permittivity of BaTiO3-based nanocrystalline ceramics sintered by spark plasma sintering

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Abstract

In pursuit of high permittivity materials for electronic application, there has been a considerable interest recently in the dielectric properties of various perovskite oxides like calcium copper titanate or lanthanum doped barium titanate. When processed in a particular way, this later material present at ambient temperature and at f = 1 kHz unusual interesting dielectric properties, a so called “colossal” permittivity value up to several 106 with relatively low dielectric losses. Moreover and contrary to what is classically expected and evidenced for this type of materials, no temperature dependence is observed. This behavior is observed in nanopowders based ceramics. An assumption to explain the observed properties is proposed. These results have important technological applications, since these nanoceramics open a new route to the fabrication of very thin dielectric films.

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Acknowledgements

The authors thank Ch. Calmet for the FEG SEM observations, G. Raimbeaux and C. Estournes for the help in the SPS experiments and Ch. Labrugere for the XPS measurements.

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Correspondence to S. Guillemet-Fritsch.

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Valdez-Nava, Z., Guillemet-Fritsch, S., Tenailleau, C. et al. Colossal dielectric permittivity of BaTiO3-based nanocrystalline ceramics sintered by spark plasma sintering. J Electroceram 22, 238–244 (2009). https://doi.org/10.1007/s10832-007-9396-8

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  • DOI: https://doi.org/10.1007/s10832-007-9396-8

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