Growth, optical, dielectric, thermal and mechanical properties of pure and Sr(II)-doped L-asparagine monohydrate single crystals.

K. Syed Suresh Babu

Abstract

Single crystal organic nonlinear optical materials of pure and Sr(II)-doped L-asparagine monohydrate (LAM) were successfully grown by slow evaporation method at room temperature. The lattice parameter of the grown crystals was subjected to single crystal X-ray diffraction method. The UV-Vis-NIR spectrum of pure and doped LAM possess a wide optical transmission window of range 230 - 1100 nm. The grown compounds were also characterized by FTIR analysis. The presence of Sr(II) in the grown crystal was confirmed by Inductively-Coupled Plasma (ICP) elemental analysis. The dielectric behaviour of the grown crystals has been studied at room temperature in the frequency range 50 Hz - 5 MHz. Thermal stability of the crystal was also studied by TGA/DTA and DSC analyses. The mechanical strength of the grown crystal has been determined with the aid of Vickers hardness test. The nonlinear optical property of the crystal was tested by Nd:YAG laser source.