48. A Model for the Bulk Mechanical Response of Porous Ceramics Exhibiting a Ferroelectric-to-Antiferroelectric Phase Transition During Hydrostatic Compression

  1. Edgar Lara-Curzio and
  2. Michael J. Readey
  1. Stephen T. Montgomery and
  2. David H. Zeuch

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291191.ch48

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

How to Cite

Montgomery, S. T. and Zeuch, D. H. (2004) A Model for the Bulk Mechanical Response of Porous Ceramics Exhibiting a Ferroelectric-to-Antiferroelectric Phase Transition During Hydrostatic Compression, in 28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4 (eds E. Lara-Curzio and M. J. Readey), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291191.ch48

Author Information

  1. Sandia National Laboratories Albuquerque, NM 87185

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2004

ISBN Information

Print ISBN: 9780470051528

Online ISBN: 9780470291191

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Keywords:

  • tensile behavior;
  • fibre strength;
  • equal load sharing;
  • polymer matrix composites;
  • local load sharing

Summary

At ambient conditions a niobium-doped lead zirconate-titanate composition (PZT 95/5-2Nb) is ferroelectric with a rhombohedral structure, but near the boundary for an antiferroelectric phase having an orthorhombic structure. Applying a hydrostatic pressure of about 0.25 GPa causes the unpoled ceramic to undergo a ferroelectric-to-antiferroelectric polymorphic phase transition with a ∼0.9% reduction of volume. Voids present in the ceramic produce localized inhomogeneity in the stress field resulting in both a spread of the transformation over a range of pressure and a reduction in the applied pressure at the onset of the transformation with increasing material porosity. A model for a porous ceramic exhibiting a ferroelectric-to-antiferroelectric phase transition that explicitly accounts for the influence of porosity on the bulk mechanical response will be described and compared to measurements of pressure versus volume strain for two ceramics with different porosity.