Urea/thiourea induced crystal growth of ammonium nickel sulfate hexahydrate and characterization studies

Autor: M. Rajasekar, S. C. Mojumdar, G. Bhagavannarayana, Sp. Meenakshisundaram, K. Meena, K. Muthu
Rok vydání: 2014
Předmět:
Zdroj: Journal of Thermal Analysis and Calorimetry. 119:963-968
ISSN: 1588-2926
1388-6150
DOI: 10.1007/s10973-014-4246-9
Popis: Single crystals of ammonium nickel sulfate hexahydrate, (NH4)2Ni(SO4)2·6H2O (ANSH), are grown by conventional slow evaporation solution growth technique at room temperature from an aqueous solution containing an excess of urea/thiourea. Structural analysis by single crystal X-ray diffraction analysis reveals that the crystal belongs to monoclinic system with centrosymmetric space group P21/c and the cell parameters are a = 6.246(2) A, b = 12.45(4) A, c = 9.21(2) A, β = 106.96°. The powder X-ray diffraction and high-resolution X-ray diffraction studies reveal the crystallinity and crystalline perfection of the grown crystal. Optical absorbance spectrum indicates a discontinuous transmission pattern. An increase in dielectric and conductivity parameters with the increase of temperature at all frequencies is observed. Thermal studies reveal that there is no decomposition up to the melting point. Probable mechanism of facile crystal growth of the title compound in the presence of excess urea/thiourea as inducer is analyzed.
Databáze: OpenAIRE
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