Improving structural, UV–visible, SHG efficiency, third order nonlinear optical, mechanical, thermal and dielectric properties of ZTC crystal using π-bonded ligand of oxalic acid

Abstract Growth of pure and oxalic acid (OA) added zinc thiourea chloride (ZTC) crystals was achieved by slow evaporation method. The structural parameters of these have been confirmed by single crystal XRD. Incorporation/presence of OA in ZTC crystal was established by EDS. Optical transparency of grown crystals has been evaluated in 200–900 nm region and linear optical constants are examined in visible region using the UV–visible transmittance data. SHG efficiency of OA:ZTC crystal is observed to be 4.51 times that of ZTC crystal tested by Kurtz-Perry method. Z-scan measurement was done at 632.8 nm to confirm the nature of third order nonlinearity of OA:ZTC crystal and third order nonlinear susceptibility (χ(3)), refraction (n2) and absorption coefficient (β) were evaluated. Mechanical behavior of OA:ZTC crystal is investigated using Vicker's microhardness studies. Dielectric properties of crystals were comparatively investigated at different temperature. The thermal stability and melting point of OA doped ZTC crystal material has been determined employing thermogravimetric and differential scanning calorimetric analysis.