Abstract
Pure potassium dihydrogen phosphate (KDP) crystals and KDP doped with L-alanine have been grown by slow evaporation technique at room temperature. Grown crystals have been characterized using powder X-ray diffraction, (XRD), Energy Dispersive X-ray spectroscopy (EDX) and Fourier Transform Infrared spectroscopy (FTIR). The presence of L-alanine into pure KDP crystal was confirmed by FTIR and EDX spectra. Crystal structure has been studied by XRD. Pure KDP and L-alanine doped KDP crystals both possessed tetragonal structure. The transparency is found to increase with the increase of doping concentrations of the grown crystals as observed by UV-Vis spectra. A.C. electrical conductivity of grown crystals along the growth axis was carried out at various temperatures ranging from 35?C - 400?C. Dielectric constant and dielectric losses are measured as a function of temperature and this study reveals the contribution of space charge polarization. Crystal defects and surface morphology are studied by dissolution solvent technique and reveals the step growth mechanism for both pure and doped crystals.
Highlights
The demand for high quality large size KDP single crystal increases due to its application as frequency conversion crystal in inertial confinement fusion [1,2]
L-arginine and L-alanine with KDP crystals were studied by FT-IR by Muley et al [5]
The authors confirmed the interaction between KDP and organic amino acid by additional peaks corresponds to the functional groups of L-arginine and L-alanine
Summary
The demand for high quality large size KDP single crystal increases due to its application as frequency conversion crystal in inertial confinement fusion [1,2]. Kumaresan et al [11] has reported the thermal dielectric properties of amino acids such as L-glutamic acid, L-histidine and L-valine doped KDP crystals. They found improved NLO properties of the KDP crystal and modifications in the structural, optical, mechanical, and electrical properties, too. Kumaresan et al [13] has reported the effect of metal ion and amino acid doping on the optical properties of KDP crystal. Suresh Kumar and Rajendrababu [6] studied the effects of L-arginine, L-histidine and glycine on the growth of KDP single crystals and observed that addition of amino acid enhances transparency, thermal stability and NLO efficiency of KDP crystals. The grown crystals were characterized by FT-IR, EDX, XRD, A.C. electrical conductivity, dielectric constant, and dielectric loss, etch pits and compared all these results with pure KDP crystal
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