Sodium sulfanilate dihydrate (SSDH) single crystals grown by conventional slow evaporation and Sankaranarayanan-Ramasamy (SR) method and its comparative characterization analysis

Materials Chemistry and Physics (Impact Factor: 2.26). 01/2011; 132(2-3). DOI: 10.1016/j.matchemphys.2011.12.057


A transparent uniaxial sodium sulfanilate dihydrate (SSDH) single crystal having dimension of 30 mm diameter and 100 mm length was grown by Sankaranarayanan-Ramasamy (SR) method with a growth rate of 1 mm per day. Using an identical solution the conventional crystal grown to a dimension of 12×20×5 mm3 was obtained over a period of 20 days. The crystal structure has been confirmed by single crystal X-ray diffraction measurement. The crystalline perfection of sodium sulfanilate dihydrate crystals grown by conventional and SR method were characterized using chemical etching, laser damage threshold, Vickers microhardness, UV-Vis NIR, birefringence and dielectric analysis. The above study indicates that the crystal quality of the Sankaranarayanan-Ramasamy method grown sodium sulfanilate dihydrate is good compared to conventional method grown crystal. The growth features of inclusions, low angle grain boundaries, twins and cracks have been observed in conventional method grown crystals. The dielectric tensor components for unidirectional grown sodium sulfanilate dihydrate single crystal were evaluated as a function of temperature at 100 Hz frequency.

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