Investigations on the nucleation kinetics, growth and thermal properties of the organometallic nonlinear optical crystal: Hg(N₂H₄CS)₄Zn(SCN)₄

K.Rajarajan^*, P.Sagayaraj^#@, R.Sankar⁺, and Vetha Potheher^#

^*Department of Physics, R.V.Government Arts College, Chengalpattu-603 001, India

⁺Crystal Growth Centre, Anna University, Chennai-600 025, India

^#Department of Physics, Loyola College, Chennai-600 034, India

Abstract: Single crystals of Tetrathiourea mercury(II) tetrathiocyanato Zinc(II) Hg(N2H4CS)4Zn(SCN)4; (TMTZ) were grown by slow evaporation technique. The solubility of TMTZ was estimated at different temperatures in a mixture solvent of ethanol and water. The induction period was measured for the different supersaturation ratios (S=1.1, 1.2, 1.3 and 1.4). The study reveals that the induction period of TMTZ decreases with increase in supersaturation. The metastable zone width of TMTZ was measured by polythermal method and thereby the zone width suitable for growing bulk size single crystal of TMTZ was estimated to be 35-45˚C. The grown crystals have also been subjected to structural, optical and thermal studies. The TG-DTA and DSC studies show that the sample is stable up to 185.3˚C and there is no water of crystallization below 179 ˚C, which indicates that the sample can be effectively utilized for various device fabrications below 179 ˚C.

^@Corresponding author: Dr.P.Sagayaraj, Reader in Physics, Loyola College, Chennai – 600 034, India Phone: 044-22490490 Fax: 91-44-28231684 Email: [email protected]; [email protected]

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