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Etching Studies of Solution-Grown Crystals: (100) Faces of Mixed Crystals of Potassium Dihydrogen Orthophosphate and Ammonium Dihydrogen Orthophosphate (KDP-ADP)

We have critically examined the growth conditions to obtain transparent and moderate single crystals of K1-x (NH4)x H2PO4 over the entire range of composition by several tests. Defect configurations of as-grown mixed crystals have been studied by chemical etch technique with greater details. Various interesting patterns like growth hillocks, pyramids, trisection of boundaries and branching of dislocations were clearly observed on the etched surfaces of mixed crystals. Optical and scanning electron micrographs show a good correspondence between etch pits and dislocations.