Eur. Phys. J. AP
Volume 8, Number 3, December 1999
|Page(s)||225 - 232|
|Published online||15 December 1999|
Focusing effect in X-ray diffraction imaging of LiNbO3 crystals under static electric field
European Synchrotron Radiation Facility, B.P. 220, 38043 Grenoble, France
2 Polish Academy of Sciences, Swietokrzyska 21, 00049 Warszawa, Poland
Corresponding author: email@example.com
Accepted: 12 October 1999
Published online: 15 December 1999
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.
PACS: 77.84.Dy – Niobates, titanates, tantalates, PZT ceramics, etc. / 61.10.-i – X-ray diffraction and scattering / 61.72.Ff – Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.)
© EDP Sciences, 1999
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