10. The Effect of Starting Powders on the Giant Dielectric Properties of the Perovskite CaCu3Ti4O12

  1. Sheng Yao,
  2. Bruce Tuttle,
  3. Clive Randall and
  4. Dwight Viehland
  1. Barry Bender and
  2. Ming-Jen Pan

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291252.ch10

Advances in Electronic Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 26, Number 5

Advances in Electronic Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 26, Number 5

How to Cite

Bender, B. and Pan, M.-J. (2005) The Effect of Starting Powders on the Giant Dielectric Properties of the Perovskite CaCu3Ti4O12, in Advances in Electronic Ceramic Materials: Ceramic Engineering and Science Proceedings, Volume 26, Number 5 (eds S. Yao, B. Tuttle, C. Randall and D. Viehland), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291252.ch10

Author Information

  1. U. S. Naval Research Laboratory Code 6351 Washington, DC 20375

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982350

Online ISBN: 9780470291252

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Keywords:

  • significant;
  • capacitors;
  • microstructure;
  • insulating surfaces;
  • microstructure

Summary

Three different starting powders were used to test the effect of sintering time at 1100°C on the dielectric properties of CaCu3Ti4O12. Dielectric properties were correlated with the grain size microstructure using a standard IBLC model. The presence of excess CuO led to discontinuous grain growth with large flat porous grains. CaCu3Ti4O12 when synthesized using anatase as a titania substitute for rutile showed signs of enhanced sintering which reduced the porosity of the large grains resulting in a significant drop in dielectric loss. Room temperature permittivity varied from 10,538 to 368,970 depending on sintering time and starting powder.