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Keywords:

  • 77.22.Ch;
  • 77.22.Gm;
  • 77.84.Dy

Abstract

We have developed a novel route to reduce the dielectric loss of CaCu3Ti4O12 (CCTO) material based on the internal-barrier-layer-capacitance (IBLC) model. By the partial La-for-Ca substitution the dielectric loss was suppressed re-markably while the giant dielectric constant still remains. The sample of Ca0.8La0.2Cu3Ti4O12 exhibits a high dielectric con- stant over 3000 and a low dissipation factor below 0.015 at 10 kHz from 180 K to 300 K. The impedance spectroscopy analysis confirms that the decrease of dielectric loss is mainly due to the increase of conductivity in the CCTO grain/subgrain. Our result is expected to be able to promote practical applications. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)