Effect of Mg2+ substitution on structural, dielectric, and transport properties of l-tartaric acid-nicotinamide organic crystals

Single crystals of organic nonlinear optical material of pure and Mg2+ substituted l-tartaric acid-nicotinamide (LTN) were successfully grown by slow evaporation method at room temperature. The grown crystals have been subjected to single crystal X-ray diffraction to determine the unit cell dimensions and morphology. Powder XRD analysis confirms the structure and change in lattice parameter values for the doped crystals. The mode of vibration of different molecular groups present in LTN was identified by FTIR spectral analysis. The presence of magnesium in LTN crystals were confirmed by atomic absorption studies. Non-linear optical studies reveal that the SHG efficiency of the crystals is found to be increased in the presence of magnesium ions. The AC and DC conductivity, and dielectric studies were also carried out and reported for the first time. Dielectric measurements reveal that the dielectric constant of pure and doped crystals decreases with increase of frequency.