Good optical quality single crystal of L-histidine hydrochloride monohydrate (LHC) a novel semi organic NLO material was grown by slow solvent evaporation technique. The crystal was characterized by X-ray diffractometry (XRD), Fourier Transform Infra-red (FTIR), UV-Vis-NIR, TGA, DTA, microhardness and solubility studies. The SHG efficiency is found to be higher than that of KDP crystal. The dielectric constant and dielectric loss of the crystal was studied as function of frequency and the results are discussed. Photoconductivity studies were also carried out which reveals the positive photoconducting properties of the sample.

Ferroelectric domain pattern and piezoresponse (d33) versus DC bias voltage for the BCZT nanocrystalline powder.

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Thiourea has a large dipole moment and has an ability to form extensive network of hydrogen bonds. In the course of our studies on new semiorganic NLO materials, thiourea is selected to combine with nickel chloride. Single crystals of tetrakis thiourea nickel chloride are grown using silica gel. Green transparent crystals of NTC (nickel thiourea chloride) of dimension 8x4x3 mm 3 are grown in a period of 45 days. Single crystal XRD shows that the crystal belongs to body centered tetragonal symmetry class I4. The UV-Vis-NIR spectrum establishes the transmission range to be 300 nm to 2500 nm, with a sharp absorption peak at the red end of the visible region, which is due to the colour of the crystal. Photoconductivity and dielectric studies are also carried out. The mechanical strength of the crystal is estimated by Vickers hardness test. The crystal starts decomposing after about 200°C. Thus, we confirm from our present investigation that NTC is a suitable candidate for NLO applications.

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Single crystals of non-linear optical (NLO) LAHClBr were grown by slow evaporation technique from its aqueous solution. Good optical quality crystals having dimensions up to 12 x 9 x 7 mm 3 were obtained. The lattice parameters and morphology for the grown crystals were determined using single crystal XRD. The crystals were characterized by FT-Raman, optical absorption, thermal (DTA and TGA) and dielectric studies. LAHClBr was found to be thermally stable up to 124.3°C.

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