Crystallization of Zinc Sulphate Single Crystals and Its Structural, Thermal and Optical Characterization

Journal of Bangladesh Academy of Sciences, Vol. 35, No. 2, 203-210, 2011

CRYSTALLIZATION OF ZINC SULPHATE SINGLE CRYSTALS AND ITS STRUCTURAL, THERMAL AND OPTICAL CHARACTERIZATION J.K. SAHA AND J. PODDER* Department of Physics, Bangladesh University of Engineering and Technology, Dhaka-1000, Bangladesh ABSTRACT
Zinc sulphate (ZnSO4.7H 2O), an inorganic material has been crystallized by an isothermal evaporation method. ZnSO 4.7H2O is highly soluble in water and the solubility is found to be increased almost linearly with the increase of temperature. At room temperature around 34C, the solubility was found to be 92.41 gm/50 ml. The FT-IR spectroscopy was performed on pure zinc sulphate crystals to identify the presence of functional groups. The grown crystals have been subjected to powder X-ray diffraction to determine the unit cell dimensions and the crystal structure. The lattice parameters are found to be, a = 9.9810 Å, b = 7.2500 Å and c = 24.2800 Å, respectively. The values were in good agreement with those of the reported values. The TGA and DTA study revealed that the grown crystals have good thermal stability. The UV-vis spectrum showed that the material has wide optical transparency in the Ultra-violet region.

Key words: Isothermal evaporation, Crystatization, Zine sulphate, Structural characterization INTRODUCTION Zinc Sulphate Heptahydrate (ZSHH) possesses wide range of applications in the field of telecommunication, solar systems for solar energy storage, coagulation bath for rayon and optical information storage devices. The search for new frequency conversion materials over the past decade has led to the discovery of many organic materials with high nonlinear susceptibilities. However, their often inadequate transparency, poor optical quality, and lack of robustness, low laser damage threshold and inability to grow into large size have impeded the use of single crystal in various devices. Recent interest is centered on inorganic crystals because

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