Abstract
Single crystals of KDP and DKDP give a strong electro-optical effect at temperatures close to their Curie point. This property is the basis for the use of DKDP as a solid-state light modular for large-screen display devices. However, electrical conductivity hetegeneities in these crystals eventually impair the performances of the devices. The paper reports on a remarkable differentiation in electrical conductivity in polyhedral-shaped regions which result from the interaction of a dislocation line with the boundary between pyramid sectors. A close correlation is established between the lattice dilation and the electrical conductivity differentiation in these polyhedral regions as estimated by plane-wave X-ray topography and electroding decoration techniques. A phenomenological interpretation for both the genesis of the polyhedral and their physical properties is proposed.
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