Optical, mechanical and thermal behaviour of Guanidinium Carbonate single crystal

The organic nonlinear optical (NLO) crystals of Guanidinium Carbonate (GC) were grown by the slow evaporation technique. X-ray diffraction studies reveal the tetragonal structure of the grown crystal. The characterization analysis such as powder XRD and Fourier transform infra-red (FTIR) spectral analysis were carried out to find the crystalline nature and the presence of various functional groups in the grown crystal. Further, ultra-violet (UV)–visible spectral analysis, fluorescence study, Differential Thermal Analysis (DTA), Differential Gravimetric Analysis (DGA) and Vickers’ hardness were carried out to understand the crystal's optical, thermal and mechanical properties. The nonlinear optical property was confirmed by Kurtz-powder technique and it was found that the second harmonic generation efficiency of the grown crystal is 0.3 times greater than that of the standard KDP.