Colossal permittivity up to 106 at 1 KHz (0.1 < tan δ < 0.7) was achieved on 70 nm Ba0.95La0.05TiO3–x materials. The colossal permittivit value is observed in nanomaterials displaying high concentration of charge carriers and low activation energy interfaces.
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Guillemet-Fritsch et al. (2008) studied this question.
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