STRUCTURAL, MECHANICAL, OPTICAL, THERMAL, ELECTRICAL STUDIES OF A NONLINEAR OPTICAL SINGLE CRYSTAL: GAMMA GLYCINE USING LITHIUM BROMIDE AS AN ADDITIVE

Single crystals of gamma glycine, an organic nonlinear optical material were grown by slow evaporation method from aqueous solutions of lithium bromide. Good optical quality single crystals were grown within a period of 3 weeks. The grown crystals were colorless and transparent. The solubility of the grown crystals has been estimated for various temperatures. The XRD study reveals that the grown crystal crystallizes in the hexagonal crystal system and corresponding lattice parameters were determined.The reflection planes of the sample were confirmed by the powder X-ray diffraction study and diffraction peaks were indexed. Fourier transform infrared (FTIR) study was used to confirm the presence of various functional groups in the grown crystal. The optical spectral analysis of the grown crystal has been performed by UV-Vis-NIR spectroscopy and the band gap energy was found out.Second harmonic generation (SHG) for the materials of this work was confirmed using Nd:YAG laser. The thermal stability of the crystal was studied by thermo gravimetric analysis (TGA) and differential thermal analysis (DTA).The dielectric constant and the dielectric loss were measured for varying frequencies under different temperatures. The impedance measurements were performed as a function of temperature