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Alignment of defect dipoles in polycrystalline ferroelectrics

Publication Type

Journal Article

Authors

Warren, W.L., D. Dimos, G.E. Pike, K. Vanheusden, Ramamoorthy Ramesh

DOI

10.1063/1.115058

Abstract

Using electron paramagnetic resonance (EPR), we show the alignment of defect dipoles along the direction of the spontaneous polarization in polycrystalline BaTiO3 ceramics by subjecting the capacitors to a dc bias at elevated temperatures. The alignment is demonstrated to occur via orientation dependent EPR signals in the polycrystalline perovskite lattice. The alignment of the defect dipoles is found to strongly enhance the light sensitivity of the defects. This observation may have important implications for photorefractive applications.© 1995 American Institute of Physics.

Journal

Applied Physics Letters

Volume

Year of Publication

1995

ISSN

00036951

Notes

cited By 106

Research Areas

Ramesh Lab