Single Crystals of α–LiIO3 Doped with L–arginine and L–nitroarginine

Abstract

One of the essential crystals for technology is the hexagonal modification of lithium iodate (α–LiIO3), which is endowed with nonlinear optical, pyroelectric, piezoelectric, acousto–optic properties. In recent years, a number of research groups studied physical and physiochemical properties of several single crystals (KDP, ADP, BTCA, ZTC) that were grown in the presence of various amino acids (L–alanine, L–glycine, L–arginine, L–lysine, etc.). In all these studies a positive effect on growth process and crystal quality is described for the amino acids being used as dopants in solutions. Based on the promising results of existing studies, in this work the effect of mixtures of the amino acids L–arginine and L–nitroarginine on α–LiIO3 single crystals is presented. Studies of IR spectrum, UV–Vis transmittance, thermal properties and nonlinear optical activity have shown that the optical quality and physicochemical properties of the crystal were improved in the presence of amino acid dopands. Our data indicates that second harmonic generation activity of the crystals of α–LiIO3 grown with L–arginine and L–nitroarginine dopants is 1.2 times higher than that of pure α–LiIO3.

(H3O)Li2(IO3)3: crystal structure and IR spectrum

“…The solubility of (H 3 O)Li 2 (IO 3 ) 3 was determined at the same pH in aqueous solution. At 33 • C, the solubility of (H 3 O)Li 2 (IO 3 ) 3 is 80 g per 100 ml of water, consistent with the solubility of α-LiIO 3 [24,25].…”

“…By considering the technological application of the material, the growth of α-LiIO 3 was performed in space and investigated by Chen et al [21,22]. In recent years, in our laboratory studies have shown that doping a crystal with potassium permanganate [23] and amino acids [24,25] improves the non-linear optical properties of α-LiIO 3 crystal. The authors [26] have studied the Raman and IR spectra, and measured the low-frequency dielectric behavior and the piezoelectric constant g 33 in a mixture of Li 1− 𝑥 H 𝑥 IO 3 , where x ranges from 0.0 to 0.35.…”

Determination of energy band gap of α-LiIO3 doped with L-Arginine and L-Nitroarginine amino acids using diffuse reflectance spectroscopy

“…%. Detailed description of the doping method is given in [21,22]. The optical measurements were conducted using Agilent Cary 60 spectrometer.…”