Multifaceted studies on thiourea family semiorganic NLO materials: optical and thermal properties
摘要
The nonlinear optical (NLO) materials tris(thiourea) zinc sulphate (ZTS), bis(thiourea) cadmium chloride, and bis(thiourea) zinc acetate (BTZA) were synthesized and single crystals were grown by the slow evaporation technique. The powder XRD pattern was used to identify the crystallinity of the synthesized compound. The unit cell parameters and the morphology of single crystals were determined by single crystal XRD. The FTIR analysis verified the presence of the various functional groups in the synthesized compounds. The optical properties were determined by UV–Vis spectral studies which show wide transparency range (300–900 nm) with lower cutoff wavelength at 260 nm. The photoluminescence spectrum of these materials reveals the maximum emission in the ultraviolet region (380 nm). The TG/DTA analyses were performed to evaluate its thermal stability of the grown crystal and it shows ZTS has high melting point (240 °C). The microhardness study was carried out to find out mechanical strength using Vicker’s hardness test and the work hardening coefficient of BTZA was found to high (4.58). Third-order NLO susceptibility (χ3) was measured in the order of 10−6esu using Z-scan technique.