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Focusing effect in X-ray diffraction imaging of LiNbO3crystals under static electric field

Published online by Cambridge University Press:  15 December 1999

P. Pernot-Rejmánková*
Affiliation:
European Synchrotron Radiation Facility, B.P. 220, 38043 Grenoble, France
W. Laprus
Affiliation:
Polish Academy of Sciences, Swietokrzyska 21, 00049 Warszawa, Poland
J. Baruchel
Affiliation:
European Synchrotron Radiation Facility, B.P. 220, 38043 Grenoble, France
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Abstract

The X-ray diffracted intensity changes considerably when a static electric field is applied perpendicularly to a X- or Y-cut LiNbO3 platelet-shaped crystal. Section diffraction images (topographs) recorded using synchrotron radiation in transmission mode reveal the curvature of the lattice planes under such a field. A theoretical analysis based on the equations of electro-mechanical field in a piezoelectric medium together with chemical etching experiments allows us to explain this effect. Tiny inverted ferroelectric doMayns produced by the applied field exert a strain on the non-inverted bulk leading to the observed curvature of the lattice planes. This approach seems to be valid for other piezoelectric crystals of various symmetry classes.

Keywords

Type
Research Article
Copyright
© EDP Sciences, 1999

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