Growth, chemical and structural analysis of glycine potassium iodate (GPI): A new non-linear optical material

Crystals of glycine potassium iodate (GPI) have been grown from aqueous solution by slow evaporation technique at room temperature. The chemical and structural units have been verified and the crystals were found to be thermally stable up to 210 °C. Comparative IR and Raman studies indicate a molecule with lack of center of symmetry. Habit and cleavage faces treated with glacial acetic acid are seen to produce elongated and flat bottom pits. Thermal evaporation reveals the presence of well defined rhombus shaped pits on cleavage faces heated near 80 °C–100 °C. Partial cleavages, moisture, circular features and glide bands have been observed. UV studies show energy band gap of 5.92 eV in addition to the presence of a wide transparency window. An SHG efficiency of 33.81 times that of standard KDP has been recorded using Kurtz and Perry method. Vickers micro hardness measurements indicate work hardening capacity of 7.78 suitable for applications in optoelectronic setup.

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