Growth and Characterization of Thiourea–Barium Chloride Crystal

D Shyamala, S Thangavel, K Gomathi

Abstract


Organic crystals are being extensively studied due to their nonlinear optical (NLO) coefficients being often larger than those of inorganic materials. Thiourea is one of the useful crystals for generating UV radiation by frequency doubling and mixing, as it is transparent down to 200 nm. In this project, the growth and characterization of two-component organic–inorganic system of thiourea–barium chloride (TBC) is presented. The crystals have been grown by solution growth technique at room temperature. The lattice parameters of the grown crystals were determined by single crystal X-ray diffraction. The powder X-ray diffraction pattern has been recorded. The transmittance spectrum of the crystals in the UV–Vis region has been obtained. The frequency assignments of the FTIR spectrum are presented. The dielectric measurements for the crystals were carried out in the range 50 Hz to 0.5 MHz. The complex impedance plot of the crystal has been studied. The complex impedance plots were described using a Cole-Cole relaxation. Thermo gravimetric analysis (TGA) and differential scanning calorimetry (DSC) studies were done to assess the thermal stability of the grown crystals. The Broido, Coat-Redfern, and Horowitz-Metzger methods are used to calculate the activation energies from the thermal decomposition of thiourea–barium chloride.

Keywords


thiourea–barium chloride, thermogravimetric analysis, dielectric constant, activation energy.

References


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