Synthesis and Spectroscopic Characterization of Pure and l -Arginine Doped KDP Crystals
Optically good quality single crystals of pure and l -arginine-doped KDP crystals were grown by a slow evaporation method. The grown crystals were subjected to optical and dielectric studies. The unit cell parameters were calculated by X-ray diffraction.
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arge optical nonlinearity are needed to realize applications in optoelectronics, telecommunication industries, laser technology, and optical storage devices. Potassium dihydrogen phosphate (KDP) is an excellent inorganic nonlinear optical (NLO) material and has a considerable interest among several research workers because of its wide frequency, high efficiency of frequency conversion, and high damage threshold against high power laser. With the aim of improving the SHG efficiency of KDP, researchers have attempted to modify KDP crystals either by doping different type of impurities or by changing the growth conditions [1–9].
K. Indira (*) Department of Physics, Pandian Saraswathi Yadav Engineering College, Sivagangai, India T. Chitravel Department of Physics, Anna University, Madurai Region, India
S. Sathiyamoorthy et al. (eds.), Emerging Trends in Science, Engineering and Technology, Lecture Notes in Mechanical Engineering, DOI: 10.1007/978-81-322-1007-8_58, © Springer India 2012
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K. Indira and T. Chitravel
Most of amino acids possess NLO property; therefore, it is of interest to dope them in KDP crystals. The effects of amino acid on the NLO efficiency of KDP crystals were already published [1–3]. l-arginine is a potential material to produce crystals for nonlinear optical applications [3]. In the present study, l-Arginine doped KDP crystals were grown by slow aqueous solvent evaporation technique [4, 5]. The optical and dielectric behavior of the both pure and l-arginine doped KDP crystals has been studied and discussed in detail.
2 Experiment Commercially available KDP was used for the growth. Without any further purification, KDP was dissolved in double distilled water. After obtaining the saturation, the solution was stirred well for about 3 h, filtered and kept separately for the slow evaporation. Similar procedure was followed for the addition of 0.5 % l-arginine to the saturated solution of KDP. Within 12–15 days, transparent crystal of both pure and L-arginine doped KDP crystals was yielded.
3 Characterization 3.1 X-Ray Diffraction Studies Powder X-ray diffraction studies of pure and l-arginine doped KDP crystals were carried out using XPERT PRO diffractometer with CuKα (λ = 1.5418 Å) radiation. The samples were scanned for 2θ values from 10° to 80° at a rate of 2°/min. Figures 1 and 2 show the powder XRD pattern of the pure and doped KDP crystals. The powder patterns were indexed and the lattice parameter values for the pure and doped KDP crystals were calculated. It is observed that both the pure and doped crystals crystallize in Tetragonal structure. The lattice parameters of the samples are presented in Table 1. There are slight variations in the lattice parameters and cell volume of the pure and doped crystals. These variations are due to the incorporation of l-arginine in the KDP crystal lattice.
3.2 FT-IR Studies The FT-IR spectrum of pure KDP and l-arginine doped KDP crystals has been recorded within the wave number range from 500 to 4,000 cm−1. Pellets with the constituents
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