ABSTRACT Single crystal of lithium potassium sulphate, a nonlinear optical material, was grown from aqua solution by slow evapo- ration method at room temperature. The cell parameters were estimated by single crystal X-ray diffraction analysis. The optical transmittance of the crystal was recorded using the UV-Vis-NIR spectrophotometer and the optical band gap was calculated using this method. The second harmonic generation efficiency was measured by Kurtz and Perry powder technique and the phase-matching property was confirmed. The hardness of the material was measured by Vicker’s hardness test.
Cite this paper
G. Pasupathi and P. Philominathan, "Growth, Structural, optical and hardness studies of lithium potassium sulphate single crystals – an inorganic NLO material," Journal of Minerals and Materials Characterization and Engineering, Vol. 11 No. 9, 2012, pp. 904-907. doi: 10.4236/jmmce.2012.119086.
 K. C. Zhang and X. M. Wang, “Structure Sensitive Properties of KTP-Type Crystals,” Chinese Science Bulletin, Vol. 46, No. 24, 2001, pp. 2028-2036.
S. M. Ravi Kumar, N. Melikechi, S. Selvakumar and P. Sagayaraj, “Crystal Growth and Characterization of NLO Single Crystals Cd(IO3)2,” Journal of Crystal Growth, Vol. 311, No. 2, 2009, pp. 337-334.
R. Robert, C. Justin Raj, S. Krishnan and S. Jerome Das, “Growth, Theoretical and Optical Studies on Potassium Dihydrogen Orthophosphate (KDP) Single Crystals by Modified Sankaranarayanan and Ramasamy (mSR) Me- thod,” Physica B: Condensed Matter Physics, Vol. 405, No.1, 2010, pp. 20-24.
M. Karppinnen, J. O. Lundgren and R. Liminga, “Structure of Pyroelectric Lithium Potassium Sulphate, LiKSO4,” Acta Crystallographica Section C, Vol. 39, 1983, pp. 34- 38. doi:10.1107/S0108270183003509
M. A. Pimenta, S. L. V. Vierira, F. O. V. Letelier, N. L. Speziali and M. S. Dantas, “Ionic Conductivity in
LiK0.9Na0.1SO4 Single Crystals,” Solid State Communications, Vol. 82, No. 10, 1992, pp. 758-757.
A. Lunden, J. O. Thomas, “High Conductivity Solid State Conductors: Recent Trends and Applications,” Word Scientific, Singapore City, 1986.
H. K. Liu, M. L. Hu W. S. Tse, D. P. Wong and S. J. Lin, “Raman Studies of Low Temperature Phase Transition in LiKSO4,” Chinese Journal of Physics, Vol. 36, No. 3, 1998, pp. 542-548.
A. A. El-Fadl, M. A. Gaffar and M. H. Omar, “Absorption Spectra and Optical Parameters of Lithium-Potas- sium Sulphate Single Crystals,” Physica B, Vol. 269, No. 3-4, 1999, pp. 403-408.
S. K. Kurtz and T.T Perry, “A Second Harmonic Analyzer for the Detection of Non-Centrosymmetry,” Journal of Applied Physics, Vol. 39, 1968, pp. 145-158.
R. L. Sutherland, “Handbook of Nonlinear Optics,” 2nd Edition, Dekker, New York, 2003.
M. Kiguchi, M. Kato, M. Okunak and Y. Taniguchi, “New Method of Measuring Second Harmonic Generation Efficiecny Using Powder Crystals,” Applied Physics Letters, Vol. 60, No. 16, 1992, pp. 1933-1935.
A. Sonoc, M. Samoc and P. N. Prasad, “Second-Har- monic Generation in the Crystalline Complex Antimony Triiodide—Sulfur,” Journal of Optical Society of Ametica B, Vol. 9, No. 10, 1992, pp. 1819-1824.
B. W. Mott, “Micro-Indentation Hardness Testing,” Butterworths, London, 1956.
J. H. Westbrook, “Flow in Rock Salt Structure,” Report 58-RL 2033 of the GE Research Laboratory, USA, 1958.
N. A. Ashby, Journal of Nuclear Engineering, Vol. 6, 1951, p. 33.
K. K. Rao and D. B. Sirdeshmukh, “Microhardness and Interatomic Binding in Some Cubic Crystals,” Bulletin of Materials Science, Vol. 5, No. 5, 1983, pp. 449-452.
E. M. Onitsch, Mikroskopia, Vol. 2, 1947, p. 131.
M. Hanneman, Metallurgia Manchu, Vol. 23, 1941, p. 135.