The effective electromechanical moduli of ferroelectric crystals with engineered domain configurations

Jiang Yu Li; Dan Liu

doi:10.1117/12.484074

13 August 2003 The effective electromechanical moduli of ferroelectric crystals with engineered domain configurations

Jiang Yu Li, Dan Liu

Proceedings Volume 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics; (2003) https://doi.org/10.1117/12.484074
Event: Smart Structures and Materials, 2003, San Diego, California, United States

Abstract

We present a micromechanical analysis to explain the enhanced electromechanical properties of ferroelectric single crystals with engineered domain configuration. The theory starts with energy-minimization approach, where all possible energy minimizing domain configurations are characterized as the convex hull of the ferroelectric energy wells, and are constructed by multi-level laminations. The effective electromechanical moduli of ferroelectric single crystal with engineered domain configuration can then be determined exactly by the homogenization theory. Using this approach, we analyzed the engineered domain configuration in tetragonal single crystal BaTiO3 poled in <111> direction, where d33 70% higher than those poled in <001> direction has been demonstrated, consistent with experimental observation. It is also found that the two-variant domain configurations have higher enhancement than three-variant systems, suggesting an optimal domain configuration for the enhanced piezoelectric properties. The theory reveals the fundamental property enhancement mechanism in ferroelectric single crystals with engineered domain configuration, and offers insight on the design and optimization of ferroelectric single crystals with superior functional properties.

Citation Download Citation

Jiang Yu Li and Dan Liu "The effective electromechanical moduli of ferroelectric crystals with engineered domain configurations", Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); https://doi.org/10.1117/12.484074

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