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Growth and spectroscopic, thermal, dielectric and SHG studies of L- threonine doped KDP crystals

D. J. DAVE1, K. D. PARIKH1, B. B. PAREKH2, M. J. JOSHI1,*

Affiliation

  1. Crystal Growth Laboratory, Department of Physics, Saurashtra University, Rajkot 360 005, India
  2. School of Petroleum Technology, Pandit Deendayal Petroleum University, Gandhinagar – 3820071, India

Abstract

Potassium Dihydrogen Phosphate (KDP) crystals are one of the most popular crystals used for Non-linear Optical (NLO) applications. Most of amino acids also exhibit NLO property; therefore, the effect of doping of one of the amino acids, L – Threonine, in KDP crystals has been investigated. Pure and L – Threonine doped KDP crystals were grown by slow solvent evaporation solution growth technique. For obtaining doped crystal, 0.3 and 0.4 weight percent solutions of L – Threonine was added to aqueous solution of KDP. Good quality transparent crystals were obtained within 8 to 10 days. Doping of amino acid in grown crystals was confirmed by paper chromatography, C H N analysis and FT – IR spectroscopy studies. The powder XRD suggested the single phase nature and the unit cell parameters were not altered due to doping. Thermal stability of the grown crystals was studied by employing TGA. It was observed that on increasing the amount of doping the decomposition of sample occurred slightly at lower temperature than that of the pure KDP crystals. The dielectric constant and the dielectric loss of L-Threonine doped KDP crystals were lower than the pure KDP crystals. Increment in the values of the second harmonic generation (SGH) efficiency was noticed in doped crystals with comparison to the pure KDP crystals. The percentage optical transmission increased with increasing the doping of L- threonine in KDP. It was found that the doping of L – Threonine does not alter the physical properties of KDP by large extent, alike in the case of other amino acids. The results are discussed..

Keywords

Crystal growth, NLO Materials, SHG efficiency, Dielectric study, FT-IR Study, Thermo-gravimetry.

Submitted at: Feb. 10, 2009
Accepted at: May 28, 2009

Citation

D. J. DAVE, K. D. PARIKH, B. B. PAREKH, M. J. JOSHI, Growth and spectroscopic, thermal, dielectric and SHG studies of L- threonine doped KDP crystals, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 5, pp. 602-609 (2009)