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Article
Orientation Dependence of Dielectric and Relaxor Behaviour in Aurivillius Phase BaBi2Nb2O9 Ceramics Prepared by Spark Plasma Sintering
Journal of Materials Science: Materials in Electronics (2006)
  • Haixue Yan, Queen Mary University of London
  • Hongtao Zhang, Queen Mary University of London
  • Rick Ubic, Boise State University
  • Mike Reece, Queen Mary University of London
  • Jing Liu, Stockholm University
  • Zhijian Shen, Stockholm University
Abstract

Grain-oriented Aurivillius phase BaBi2Nb2 O9 ceramics were fabricated using Spark Plasma Sintering (SPS). Their relaxor behaviour was confirmed by a strong frequency dispersion of the dielectric response. The dielectric behaviour has been fitted using different relaxor models. The relaxor parameters are isotropic, while the dielectric constants are highly anisotropic. The piezoelectric constant d 33 is zero perpendicular and parallel to the hot pressing direction, and the P–E response is dominated by losses. The inability to pole the samples at room temperature is consistent with the τ ƒ temperature ( ~ ~115 K) estimated from fitting the experimental data to the Vogel–Fulcher model. This suggests that it may be possible to observe piezoelectric and ferroelectric properties at very low temperatures.

Publication Date
2006
Citation Information
Haixue Yan, Hongtao Zhang, Rick Ubic, Mike Reece, et al.. "Orientation Dependence of Dielectric and Relaxor Behaviour in Aurivillius Phase BaBi2Nb2O9 Ceramics Prepared by Spark Plasma Sintering" Journal of Materials Science: Materials in Electronics Vol. 17 Iss. 9 (2006)
Available at: http://works.bepress.com/rick_ubic/14/