Guanidinium trifluoroacetate (GTFA), a semi-organic non-linear optical material with molecular formula C 3 H 6 F 3 N 3 O 2 , has been synthesized at ambient temperature. Second harmonic generation (SHG) efficiency has been observed in this crystal though it crystallizes in centrosymmetric space group. Bulk single crystal of GTFA with a size of 22 x 7 x 2mm 3 is successfully grown by submerged seed solution method. The grown crystals of GTFA have been subjected to various characterization studies such as X-ray diffraction, CHNS, FTIR analysis, UV-Vis spectrum, TGA/DTA, powder SHG test, laser damage threshold and microhardness studies.

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Single crystals of Zinc Tris (thiourea) Sulphate (ZTS) exhibiting high transparency were grown by slow evaporation technique. Single crystal X-ray diffraction analysis reveals that the crystal belongs to orthorhombic system. The optical absorption study reveals the transparency of the crystal and is noticed in the entire visible region and the cut-off wavelength has been found to be 270 nm. The optical band gap was found to be at 3.55 eV. The dependence of extinction co-efficient (K) and the refractive index (n) on the wavelength have been observed. The electrical properties of the grown crystal have also been studied using the Cole-Cole plot.

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