Crystal Growth, Thermal, Optical, and Dielectric Properties of L-Lysine Doped KDP Crystals

Abstract

Single crystals of pure and various amount of L-lysine doped KDP crystals were grown from aqueous solution. The doping of L-lysine was confirmed by CHN analysis and FT-IR spectroscopy. Powder XRD was carried out to assess the single phase nature of the samples. The effect of doping on thermal stability of the crystals was carried out by TGA and the kinetic and thermodynamic parameters of dehydration were evaluated. It was found that as the amount of doping of amino acid, L-lysine, increased the thermal stability of the grown crystals decreased. However, the second-harmonic generation (SHG) efficiency of Nd :YAG laser and UV-vis spectroscopy studies indicated that as the L-lysine doping increased in KDP crystals the SHG efficiency and optical transmission percentage increased. The dielectric constant and the dielectric loss of L-lysine doped KDP crystals are lower than the pure KDP crystals. Hence L-lysine doped KDP crystals are found to be more beneficial from an application point of view as compared to pure KDP crystals. The results are discussed.

Growth and characterization of L‐alanine doped KDP crystals

“…On the sacrifice of slight the UV-transparency cut-off limit, the L-alanine doping increases the transparency of grown crystals. Similar results have been obtained in the case of doping of L-threonine [21] and L-lysine [22] in KDP. A complex is formed of L-alanine with iron [26], similar potassium complex might have progressively increased the optical transparency of KDP on increasing the doping of L-alanine.…”

“…The behaviour of variation is similar to that of dielectric constant with frequency. This is the normal behaviour observed earlier [22,34]. The dielectric loss is a measure of the energy absorbed by dielectric.…”

“…This also proves that the amino acid has entered the KDP crystal in a doped form. The similar nature was obtained for L-arginine, L-threonine and L-lysine doping in KDP [20][21][22]. The doped crystals possess slightly less thermal stability than the undoped crystals, which is the sacrifice to be given for obtaining higher optical transmission and higher SHG efficiency.…”

“…It has been reported earlier that the doping of amino acid L-arginine [19,20], L-threonine [21] and L-lysine [22] in KDP increases the SHG efficiency of fundamental laser beam. The approach of the present authors is to achieve improvement in optical and NLO properties of KDP crystals without other properties sacrificed much.…”

Influence of organic dopants (L-alanine and L-arginine) on structural, spectroscopic and thermal properties of ammonium dihydrogen phosphate crystal

“…The use of thremogravimetry data to evaluate kinetic parameters of solid state reaction which involves the weight loss of a sample has been widely reported in literature [10][11][12]. The kinetic parameters for dehydration process in pure and amino acids (L-alanine and L-arginine) doped ADP crystals were evaluated by using non-isothermal kinetic relation proposed by Coats et al [13], which is given below: log 10 1…”