Abstract
Pure ammonium diyidrogen phosphate and L-alanine doped ammonium diyidrogen phosphate crystals were grown from aqueous solutions by natural evaporation process. The grown crystals are characterized by Fourier Transform Infrared spectroscopy, Energy Dispersive X-ray, UV-visible spectroscopy and differential thermal analysis. Crystal structure has been studied by powder X-ray diffraction. Pure and doped crystals both possessed tetragonal structure. The optical transparency is found to increase with the increase of doping concentration in the grown crystals and band gap energies of all crystals have been calculated at their cut off frequencies. It is found that the optical band gap increases with doping concentrations. D.C.electrical conductivity of grown crystals along the growth axis was carried out at temperatures ranging from 35-140°C by the conventional two-probe method. The conductivity of the crystals increases with temperature and also increases with the L-alanine concentration. The decomposition temperatures and weight loss have been estimated from the Thermo Gravimetric Analysis and Differential Thermal Analysis and hardness was found from the Vicker’s microhardness measurement.
Highlights
Ammonium dihydrogen phosphate (NH4H2PO4) is an inorganic, piezoelectric, antiferro-electric and nonlinear optical material
The grown crystals are characterized by Fourier Transform Infrared spectroscopy, Energy Dispersive X-ray, UV-visible spectroscopy and differential thermal analysis
The decomposition temperatures and weight loss have been estimated from the Thermo Gravimetric Analysis and Differential Thermal Analysis and hardness was found from the Vicker’s microhardness measurement
Summary
Ammonium dihydrogen phosphate (NH4H2PO4) is an inorganic, piezoelectric, antiferro-electric and nonlinear optical material. It is well known for its diverse uses as electro-optic modulator, harmonic generators and parametric generators [1]. Several new complexes incorporating the amino acid L-alanine have been crystallized and their structural, optical and thermal properties have been investigated [11,12,13,14]. It was reported that the addition of some of the amino acids as dopant enhances the nonlinear optical and piezoelectric properties of inorganic materials [22,23]. Characterizations of Pure and L-alanine Doped Ammonium Dihydrogen Phosphate Crystals complex crystals with improved NLO properties. The grown crystals were characterized by FT-IR, EDX, XRD, D.C. electrical and TGA/DTA analysis and Vicker’s microhardness and compared all these results with pure ADP crystal
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