Abstract:
Using the X-ray topography method, images of near-surface charge layers in pyroelectric crystal of triglycine sulfate were obtained for the first time. These charge layers were formed by internal field of triglycine sulfate crystal and by applied external electric field along the polar direction [010]. These layers were detected by increase in the integral intensity of X-ray radiation, which indicates the formation of an extinction contrast for the diffraction reflection 060 and much less pronounced changes for 400 reflection. With an increase in the external field strength up to 150 V/mm, an increase in the intensity in these regions and no changes in the center of the crystal were observed, which indicates compensation of the electric field in the volume due to the accumulation of charge carriers in a layer with a thickness of 1 mm. This effect depends on the polarity and is reversible when the external electric field is removed. Application of the field along the non-polar direction [100] does not lead to changes in the topograms.
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