Abstract
L-asparagine potassium nitrate was prepared and crystallized in the form of a single crystal by the slow evaporation solution growth method. The obtained crystal was colourless, brilliant, and transparent with well-defined facets, which suggested high purity. Synthesis was performed in a 1:1 molar ratio of L-asparagine and potassium nitrate, and the process of crystal growth was monitored carefully for 15 days. Elemental analysis revealed the anticipated stoichiometric composition of the compound. X-ray diffraction analysis showed sharp, well-defined Bragg peaks, establishing the crystalline nature of the material and determining it to have an orthorhombic crystal system. The optical behavior of the crystal was investigated using UV–visible (UV-vis) spectroscopy, which revealed good transparency in the visible range with a cutoff wavelength of approximately 250 nm, indicating its suitability for optical applications. The bandgap energy was calculated to be 4.7 eV. Fourier transform infrared (FTIR) spectroscopy was employed to determine different functional groups, with characteristic absorption bands representing O-H, N-H, and C=O stretching vibrations, establishing the molecular structure. The Non-Linear Optical (NLO) characteristics of the synthesized compound were studied by the Kurtz and Perry powder method, which indicated that the SecondHarmonic Generation (SHG) efficiency of the compound was 0.68 times greater than that of potassium dihydrogen phosphate (KDP), a reference NLO material. These results indicate that L-asparagine potassium nitrate is a good candidate for optoelectronic and photonic device applications.
Keywords: Elemental Analyses, Optical Properties, Potassium Dihydrogen Phosphate, Structural Features.