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Synthesis and characterization of potassium magnesium sulphate hexahydrate crystals
Author(s) -
Dhandapani M.,
Thyagu L.,
Prakash P. Arun,
Amirthaganesan G.,
Kandhaswamy M. A.,
Srinivasan V.
Publication year - 2006
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200510582
Subject(s) - monoclinic crystal system , differential scanning calorimetry , thermogravimetry , fourier transform infrared spectroscopy , differential thermal analysis , thermal decomposition , chemistry , thermal analysis , potassium , analytical chemistry (journal) , magnesium , aqueous solution , infrared spectroscopy , crystal (programming language) , crystallography , crystal structure , nuclear chemistry , inorganic chemistry , thermal , organic chemistry , chemical engineering , diffraction , thermodynamics , programming language , physics , optics , computer science , engineering
Potassium magnesium sulphate hexahydrate (picromerite) was synthesized and single crystals were obtained from saturated aqueous solution by slow evaporation method at room temperature. The crystals were bright, colourless and transparent having well defined external faces. The grown crystals were characterized through Fourier Transform Infrared (FTIR) spectral studies and thermal analysis. The FTIR data were used to assign the characteristic vibrational frequencies of the various chemical bonds in the compound. The compound crystallizes in monoclinic lattice with the space group P2 1 /c. The thermogravimetry (TG) indicates the removal of only two water molecules around 100 °C. A suitable decomposition pattern was formulated based on the percentage weight losses observed in TG of the compound. The results of differential thermal analysis (DTA) conform to the results of TGA. Differential scanning calorimetry (DSC) analysis carried out at high temperature suggests that the occurrence of two phase transitions in the crystal between 140 and 180 °C. When the crystal was cooled below the room temperature up to –170 °C, no thermal anomaly was observed. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)