ABSTRACT: The single crystals of Urea-Thiourea, a nonlinear optical organic (NLO) material, were grown by slow solvent evaporation technique at 40-45°c temperature. Two solvents viz. Acetone and water were used as solvent. The crystals so obtained were good in size and transparent in visible region of the spectrum. The grown crystals were subjected to different Characterizations such as structural and Optical characterization using XRD, FTIR, and UV spectrophotometer. The XRD results show that crystals are perfectly Crystalline in nature and bears orthorhombic structure. The lattice parameters so calculated from XRD are a=7.62Å, b=8.44Å, c=5.51Å. Fourier transform infrared (FTIR) were recorded to confirm the functional groups. These results indicate that grown crystals have two amide functional group and one carbonyl group. UV visual transmittance studies show that the grown crystals have optical transparency over the entire visible region and the cut-off wavelengths occurs at 201, 252 nm. The optical energy gaps for Urea-Thiourea crystals were found to be 4.2 eV & 3.8 eV, grown using different solvents.
Keywords: Diffraction ,evaporation, ftir, nlo, UV study
[1] Santhanaraghavan, P., Ramasamy, P. (2001). Crystal growth process and method. India, KRU publications.
[2] Achintya, K. Bhowmik, Shida Tan, Ayayi C. Ahyi, J.A. Dharmadhikari,K. Dharmadhikari and D. Mathur, Optic commun. 280, 472 (2007).
[3] G. Ramesh Kumar, S. Gokul Raj, R. Sankar, R. Pandi and R. Jayavel, J. Cryst. Growth. 267,213 (2004).
[4] Madhavan J, Arun S, Thomas P C, Vimalan M, Rajasekar S A, and Sagayaraj P, Cryst. Res. Tech, 2007;42;59-64.
[5] Kal Qui J and lan, mater sci B , 133(2006) 191.
[6] Shah c ,J phys condence matter ,15 (2005) L (669).