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      CaCu3Ti4O12: One-step internal barrier layer capacitor

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      Applied Physics Letters
      AIP Publishing

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          Electroceramics: Characterization by Impedance Spectroscopy

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            High Dielectric Constant in ACu3Ti4O12 and ACu3Ti3FeO12 Phases

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              Optical response of high-dielectric-constant perovskite-related oxide.

              Optical conductivity measurements on the perovskite-related oxide CaCu3Ti4O12 provide a hint of the physics underlying the observed giant dielectric effect in this material. A low-frequency vibration displays anomalous behavior, implying that there is a redistribution of charge within the unit cell at low temperature. At infrared frequencies (terahertz), the value for the dielectric constant is approximately 80 at room temperature, which is far smaller than the value of approximately 10(5) obtained at lower radio frequencies (kilohertz). This discrepancy implies the presence of a strong absorption at very low frequencies due to dipole relaxation. At room temperature, the characteristic relaxation times are fast (less than or approximately 500 nanoseconds) but increase dramatically at low temperature, suggesting that the large change in dielectric constant may be due to a relaxor-like dynamical slowing down of dipolar fluctuations in nanosize domains.
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                Author and article information

                Journal
                Applied Physics Letters
                Appl. Phys. Lett.
                AIP Publishing
                0003-6951
                1077-3118
                March 25 2002
                March 25 2002
                : 80
                : 12
                : 2153-2155
                Article
                10.1063/1.1463211
                6d71f8de-af7c-481f-a888-5fdfbfc37312
                © 2002
                History

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