Chapter 5. The Formation Mechanism for Dendritic Phase(S) in BaTiO3 Ceramcs

  1. Waltraud M. Kriven and
  2. Hua-Tay Lin
  1. X. Xu and
  2. G. E. Hilmas

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294826.ch5

27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: B: Ceramic Engineering and Science Proceedings, Volume 24, Issue 4

27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: B: Ceramic Engineering and Science Proceedings, Volume 24, Issue 4

How to Cite

Xu, X. and Hilmas, G. E. (2003) The Formation Mechanism for Dendritic Phase(S) in BaTiO3 Ceramcs, in 27th Annual Cocoa Beach Conference on Advanced Ceramics and Composites: B: Ceramic Engineering and Science Proceedings, Volume 24, Issue 4 (eds W. M. Kriven and H.-T. Lin), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294826.ch5

Author Information

  1. University of Missouri-Rolla, 225 McNutt Hall, Rolla, MO 65401

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2003

ISBN Information

Print ISBN: 9780470375846

Online ISBN: 9780470294826

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Keywords:

  • dendritic;
  • ceramics;
  • dielectrics;
  • densification;
  • abnormal grain

Summary

The formation mechanism for a dendritic phase in BaTiO3 ceramics was investigated. Results show that the needle-like Ba6Ti17O40 only appeared at sintering temperatures above the eutectic point in TiO2 excess BaTiO3. The dendritic phases in BaTiO3 only occur with the presence of both Nb5+ dopant and an excess of TiO2. The composition of the dendritic phase is close to Ba6Ti17O40 and Ba6Ti14Nb2O39 based on EDS analysis. Both the Ba6Ti17O40 and the Ba6Ti14Nb2O39 phases are linear dielectrics with low dielectric constants of 59 and 57, respectively.