12. Effect of A-Site Substitutions on the Microstructure and Dielectric Properties of Bismuth Sodium Titanate-Based Ceramics Exhibiting Morphotropic Phase Boundary

  1. Sheng Yao,
  2. Bruce Tuttle,
  3. Clive Randall and
  4. Dwight Viehland
  1. R. Vintila,
  2. G. Mendoza-Suarez,
  3. J. A. Kozinski and
  4. R. A. L. Drew

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291252.ch12

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

Vintila, R., Mendoza-Suarez, G., Kozinski, J. A. and Drew, R. A. L. (2005) Effect of A-Site Substitutions on the Microstructure and Dielectric Properties of Bismuth Sodium Titanate-Based Ceramics Exhibiting Morphotropic Phase Boundary, 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.ch12

Author Information

  1. McGill University, 3610 University St. Montreal, Quebec, H3A2B2

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:

  • microstructure;
  • substituting;
  • permittivity;
  • tetragonal;
  • antiferroelectric

Summary

This study reports on the microstructure and dielectric properties of calcium and strontium solid solutions in bismuth-sodium-titanate (BNT) ceramics with composition Cax(Bi0.5Na0.5)1-xTiO3 and Sry(Bi0.5Na0.5)1-yTiO3, which exhibit morphotropic phase boundaries. The results showed, that the best dielectric properties in the high temperature region were obtained for × = 0.05 and y = 0.27 near room temperature. All the ceramic compositions exhibited a single-phase perovskite structure. Strontium additions lowered both the antiferoelectric phase transition temperature and Curie point. Further, substituting bismuth with lanthanum on the A site in both BNT-CT and BNT-ST systems yielded lower smaller grain size and lower dielectric loss, of BNT-based ceramics.