Crystal Research and Technology
Cryst. Res. Technol. 40, 1155 (2005) - Abstract -

Thermal and infrared studies of calcium malate crystals grown in diffusion limited medium

T. Jini, K. V. Saban, and G. Varghese

Department of Physics, St. Berchmans College, Changanassery, Kerala 686 101, India

Keywords crystal growth, hydro-silica gel, calcium malate-deca hydrate, XRD, FTIR, thermal decomposition
PACS 81.10.Dn, 61.10.Nz, 67.80.Gb, 78.30.-j
DOI 10.1002/crat.200410509

Single crystals of the title compound Ca (C4H5O5)2.10H2O are grown in silica gel using controlled chemical reaction method. Multifaceted single crystals of size up to 8x4x2 mm3 are obtained. Powder X-Ray Diffraction (XRD) pattern of the grown crystal and the Fourier Transform Infra-Red (FTIR) spectrum in the range 400-4000 cm-1 are recorded. The vibrational bands corresponding to different functional groups are assigned. Thermal decomposition stages observed in the Thermo-gravimetric (TG) and Differential Thermal Analysis (DTA) studies are discussed. A six-stage thermal decomposition scheme is proposed for the compound.




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