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Abstract

An organic NLO material viz., mono-urea oxalic acid (MUOA) crystal was synthesized and grown as the single crystal by slow  vaporation
technique using the double distilled water as the solvent. The grown crystal was transparent, colourless and the size of the crystal was about 14 mm × 17 mm × 7 mm obtained within a period of 30 days. The grown crystal was subjected to various studies like XRD, microhardness, linear optical studies, SHG studies and Z-scan studies. The mono-urea oxalic acid crystals crystallize in monoclinic  structure with a centrosymmetric space group. This crystal gives out SHG emission even though it is a centrosymmetric crystal. The  mechanical parameters like hardness, work hardening coefficient, yield strength and stiffness constant were evaluated. UV-visible  spectrum was recorded in the wavelength range of 190-1100 nm to find the linear optical parameters like transmittance, band gap, absorption coefficient and extinction coefficient. Third order NLO studies were carried out by Z-scan technique to find non-linear absorption coefficient, nonlinear refractive index and non-linear susceptibility. 

Keywords

Crystal growth Single crystal XRD NLO Transmittance Hardness Z-scan Extinction coefficient Stiffness constant

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Copyright (c) 2018 T. Manju, P. Selvarajan

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