Abstract
In-situ white-beam synchrotron radiation topographic observations under an electric field have been made on KTiOPO4 family crystals. The investigation shows a strong enhancement of diffracted intensity of hkl reflections (l ≠ 0) and the topographic extinction contrast, when the field is applied along the polar axis. Doped and undoped samples with grown-in defects are studied in detail. It is believed that the movement of K+ ions driven by the field leads to a local accumulation of charges and the lattice distortion. All the field-related phenomena appear to be related to the one-dimensional ionic conductance.
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