Glycine Ammonium Sulphate (GAS) is one of the potential materials for nonlinear optical (NLO) applications. Single crystals of GAS with high degree of transparency were grown from aqueous solution of glycine and ammonium sulphate at room temperature by slow evaporation technique. Crystalline nature of the crystals has been studied by XRD analysis. Fourier Transform Infrared (FTIR) studies confirm the presence of functional groups in the grown crystals. The relative Second Harmonic Generation (SHG) efficiency of the grown crystals was measured by Kurtz and Perry Powder technique .UV-visible transmittance spectra showed wide transparency window in visible and near IR region. The real and imaginary parts of impedance and electric modulus were investigated for the GAS crystal as a function of frequency and temperature. The hardness values of the grown sample have been found by Vickers microhardness test.
