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Overview

The transparent nonlinear optical (NLO) single crystal of Sodium Sulphate Tartrate (SST) is grown using the slow evaporation solution technique (SEST). The single-crystal X-ray diffractometer (XRD) study confirms that the grown SST belongs to an orthorhombic crystal system with space group P212121. The crystalline nature and purity of SST are confirmed by the powder XRD technique. The FT-IR and FT-Raman spectrum is recorded to identify the functional groups present in the SST crystal. The lower cutoff wavelength and optical band gap of the grown crystal are determined using transmission spectra and found to be 240 nm and 5.25 eV, respectively. The photoluminescence study confirms the green emission of SST crystal which specifies the grown crystal is well suited for NLO applications. The thermo gravimetric analysis (TGA) and differential thermal analyses (DTA) are used to identify the melting point and the thermal stability of the grown crystals. From the Vickers micro hardness test, the mechanical behavior of the title compound was studied. The second harmonic generation (SHG) efficiency is measured by the Kurtz powder method and it is found to be 1.16 times that of Potassium dihydrogen Phosphates (KDP).

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