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Proceedings Paper

Mechanics of large electrostriction in ferroelectrics
Author(s): Eric N. Burcsu; Guruswaminaidu Ravichandran; Kaushik Bhattacharya
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Paper Abstract

The complex arrangement of domains observed in ferroelectric crystals is a consequence of multiple energy minima of the crystal free energy density. Since the total energy is a sum of the free energy, and electrical and mechanical work, switching between the different energetically equivalent domain states can be achieved by both electrical and mechanical means. For many ferroelectric materials, this result in an electrostrictive phenomenon resulting from domain switching. In the current study, the electrostrictive behavior of single crystal ferroelectric perovskites has been investigated experimentally. Experiments have been performed in which a crystal of barium titanate is exposed to a constant compressive stress and an oscillating electric field and global deformation is measured. The combined electromechanical loading result in a cycle of stress and electric field induced 90 degree domain switching. The domain switching cycle result in a measurable strain response theoretically limited by the crystallographic unit cell dimensions. Induced strains of more than 0.8 percent have been measured in barium titanate. Larger strains of up to 5 percent are predicted for other materials of the same class.

Paper Details

Date Published: 14 June 2000
PDF: 9 pages
Proc. SPIE 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics, (14 June 2000); doi: 10.1117/12.388214
Show Author Affiliations
Eric N. Burcsu, California Institute of Technology (United States)
Guruswaminaidu Ravichandran, California Institute of Technology (United States)
Kaushik Bhattacharya, California Institute of Technology (United States)

Published in SPIE Proceedings Vol. 3992:
Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics
Christopher S. Lynch, Editor(s)

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