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Imaging of Ferroelectric Domains in KTiOPO4 Single Crystals by Synchrotron X-RAY Topography

Published online by Cambridge University Press:  21 February 2011

S. Wang ,
M. Dudley ,
L.K. Cheng ,
J.D. Bierlein  and
W. Bindloss
S. Wang
Affiliation:
Dept. of Materials Science and Engineering, SUNY at Stony Brook, NY 11794-2275
M. Dudley
Affiliation:
Dept. of Materials Science and Engineering, SUNY at Stony Brook, NY 11794-2275
L.K. Cheng
Affiliation:
E.I. du Pont de Nemours & Company, Inc., Experimental Station, Central R&D Dept., P.O. Box 80306, Wilmington, DE 19880-0306
J.D. Bierlein
Affiliation:
E.I. du Pont de Nemours & Company, Inc., Experimental Station, Central R&D Dept., P.O. Box 80306, Wilmington, DE 19880-0306
W. Bindloss
Affiliation:
E.I. du Pont de Nemours & Company, Inc., Experimental Station, Central R&D Dept., P.O. Box 80306, Wilmington, DE 19880-0306
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Abstract

The application of synchrotron white beam X-ray topography to the study of ferroelectric domain structures in hydrothermally grown potassium titanyl phosphate (KTiOPO4: KTP) single crystals is reported. The domain walls can be exclusively imaged on topographs with selected diffraction vectors and X-ray wavelengths, while images of other defects, such as dislocations, inclusions and surface scratches, can be simultaneously made very diffuse. The topographic images correspond well with electrostatic toning images. X-ray topography readily reveals the three dimensional shapes of the domain walls. There are two contributions to domain wall contrast: one is fringe-like which can be interpreted in terms of the dynamical theory of X-ray diffraction, and the other is diffuse strain contrast arising from long range strain associated with the wall. These two contributions can be observed simultaneously or separately depending on the diffraction conditions. The long range strain is thought to be associated with the curvature of the domain walls. It appears that the main components of the displacement field associated with this strain are directed approximately perpendicular to the domain wall.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 310: Symposium N – Ferroelectric Thin Films III , 1993 , 29
Copyright
Copyright © Materials Research Society 1993

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