Twin-coupled domain structures in epitaxial relaxor ferroelectric Ba(Zr,Ti)O3 thin films on (001) MgO substrate |
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| Authors: | J. He E.I. Meletis J. Liu G. Collins C.L. Chen |
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| Affiliation: | 1. Department of Material Science and Engineering , University of Texas at Arlington , Arlington, TX 76019, USA;2. Department of Physics and Astronomy , University of Texas at San Antonio , San Antonio, TX 78249, USA |
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| Abstract: | We report the twin-coupled multi-oriented domain structures in the epitaxial BZT20 (20%Zr) films grown on the (001) MgO substrate using pulsed-laser deposition. Transmission electron microscopy shows that the film consists of an epitaxial layer of pseudo-cubic perovskite structure and a nanopillar layer of multi-oriented twin domain structures near the surface. Four types of the twin domains were formed in the nanopillar layers by coherently joining their {111} with the epilayer and aligning their ?110? directions parallel to the ?110? axes of the epilayer. A non-uniform polarization switching behavior was observed due to the formation of such complex structure in the BZT20 films. |
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| Keywords: | TEM epitaxial ferroelectric films domain structures |
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