Effect of L-Valine on the growth and characterization of Sodium Acid Phthalate (SAP) single crystals

• Pure and L-Valine doped SAP single crystal have been grown by slow evaporation method.
• Vibrational bands were analyzed by FTIR spectra.
• Thermal stability and melting point increased in L-Valine doped SAP crystal.
• Mechanical stability and SHG efficiency increased due to doping.
• The doping enhances the optical applications of L-Valine doped SAP crystal.

Undoped and amino acid doped good quality single crystals of Sodium Acid Phthalate crystals (SAP) were grown by slow evaporation solution growth technique which are semiorganic in nature. The effect of amino acid (L-Valine) dopant on the growth and the properties of SAP single crystal was investigated. The single crystal X-ray diffraction studies and FT-IR studies were carried out to identify the crystal structure and the presence of functional groups in undoped and L-Valine doped SAP crystals. The transparent nature of the grown crystal was observed using UV–Visible spectrum. The thermal decomposition of the doped SAP crystals was investigated by thermo gravimetric analysis (TGA) and differential thermal analysis (DTA). The enhancement in the NLO property of the undoped and L-Valine doped SAP crystals using KDP crystal as a reference was studied using SHG measurements. Vickers micro hardness measurements are used for the study of mechanical strength of the grown crystals.

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