Growth and characterization ofa-nickel sulphate hexahydratesingle crystal


Single crystal ofa-nickel sulphate hexahydrate,a-NiSO4.6H2O(a-NSH) is grown from aqueous solution by slow evaporationmethod. Solubility and metastable zone width ofa-NSH are determined from the aqueous solution. The three dimensional structureis elucidated by single crystal X-ray diffraction studies. Thea-NSH crystallizes in the nonecentrosymmetric tetragonal spacegroupP41212. The relative contributions of various intermolecular interactions involved in the crystal structure are quantified usingHirshfeld surface analysis and the decomposed two dimensional fingerprint plots. Fourier transform infrared spectral analysis andVickers microhardness studies are carried out to characterize the grown crystal. Further the grown crystals are characterized usingTGA, DSC, UVeViseNIR and dielectric analysis. The third order nonlinear optical properties are studied by Zescan techniquewith HeeNe laser radiation of wavelength 632.8 nm and the corresponding nonlinear refractive index, absorption coefficient andoptical susceptibility are calculated. Crystalline perfection is assessed by etching studies and laser damage threshold is observed forthe grown crystal.