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Single crystals of potassium p-nitrophenolate dihydrate (NPK·2H 2 O) have been grown successfully using the isothermal solvent evaporation technique. It is a new semiorganic nonlinear optical crystal, possessing a d eff of about 1.5 times that of lithium niobate and in which the K + ions are bonded to the nitro group instead of bonding with the phenolic O − . Large...
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