Domain switching in ferroelectric perovskites and applications

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• Professor Kaushik Bhattcharya, CalTech
• Friday 23 January 2009, 14:30-15:00
• LR6, Department of Engineering.

If you have a question about this talk, please contact Ms Helen Gardner.

Mechanics Colloquia, note room - LR6 and time - 2.30pm

This talk will describe recent theoretical and experimental investigations of domain switching in ferroelectric perovskites. The motivation for this work is actuator, sensor and optical applications. We begin with a theoretical model of single crystal materials, and use it to motivate an approach to large strain electrostriction under combined electro-mechanical loads. We describe the experimental set up and results that demonstrate this large strain electrostriction. We generalize the model to recognize the fact that ferroelectric materials are wide-band-gap semiconductors, and discuss its consequences on depletion layers, domain walls and defect diffusion. We then turn to ceramics or polycrystals. We present a theoretical analysis that shows that intergranular constraints against 90 degree domain switching depend on the symmetry of the material. This provides a new insight into the important of compositions in lead titanate zirconate. We close with some new ideas towards constructing tunable photonic devices using ferroelectric perovskites.

This talk is part of the Engineering - Mechanics and Materials Seminar Series series.

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