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Phys. Rev. B 59, 3414 - 3420 (1999)

Dislocation-density changes upon poling of polycrystalline BaTiO3

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Davor Balzar *
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Boulder, Colorado 80303
Department of Physics, University of Colorado, Boulder, Colorado 80309

Hassel Ledbetter
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Boulder, Colorado 80303

Peter W. Stephens
Department of Physics, State University of New York, Stony Brook, New York 11794

Eun Tae Park and Jules L. Routbort
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439

Received 20 May 1998; revised 28 September 1998

We report evidence for a significant increase of bulk dislocation density upon poling of polycrystalline BaTiO3. The synchrotron high-resolution x-ray-diffraction measurements yield a dislocation density on the order of 109/cm2 and an associated strain-energy increase of about 20 kJ/m3. This implies that the application of an external poling field generates defects in the structure and increases the internal stress. Possible consequences in both bulk and thin-film applications include accelerated aging and microcracking.


©1999 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevB.59.3414
DOI: 10.1103/PhysRevB.59.3414
PACS: 61.72.Dd, 77.84.-s, 61.72.Hh, 61.10.-i

* Author to whom correspondence should be addressed. Electronic address: balzar@boulder.nist.gov

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