CRYSTALLISATION AND CHARACTERISATION OF NOVEL SEMI ORGANIC NON-LINEAR OPTICAL CRYSTAL: GLYCINIUM OXALATE

Nonlinear optical amino acid single crystals of pure glycine and glycinium oxalate crystals were successfully grown by slow evaporation solution growth method. The grown crystals were subjected to different characterization studies in order to test its suitability for device fabrication. X-ray diffraction studies were carried out to examine the lattice parameters and crystallinity nature. The presence of various functional groups and their modes of vibration were identified using Fourier Transform Infrared (FTIR) spectral analysis. Optical spectral studies have been carried out to find the band gap and optical constants of the material. The lower cut off wavelength and the transparency region has been analysed using UV-Vis spectral studies. CHNS studies were used to analysethe elemental compositions of the grown crystals. Mechanical strength of the grown samples were tested by Vickers micro hardness and various parameters like work hardening coefficient, elastic stiffness constant and minimum level of indentation load has been calculated. The method adopted for crystal growth and the results obtained through various characterizations are analysed and interpreted in detail