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Pyro and Kinetic Studies of Barium Oxalate Crystals Grown in Agar Gel

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Author(s): Paresh V. Dalal | Kishor B. Saraf | Navinchandra G. Shimpi | Navneet R. Shah

Journal: Journal of Crystallization Process and Technology
ISSN 2161-7678

Volume: 02;
Issue: 04;
Start page: 156;
Date: 2012;
Original page

Keywords: Barium Oxalate | Thermo-Gravimetric Analysis | Kinetic Studies | Thermodynamic Parameters

ABSTRACT
Single crystals of barium oxalate have been grown using gel method at ambient temperature. Thermal characteristics and kinetic parameters of barium oxalate crystals were determined by thermo-gravimetric (TG) analysis under non-isothermal heating conditions. The pyrolysis experiments were performed with increasing temperature up-to 600℃ at heating rate of 5℃, 7℃ and 10℃ in nitrogen gas atmosphere. The pyrolysis curve showed that loss of mass took place mainly in the range of 220℃ - 400℃. At higher temperature there was a significant mass loss due to decomposition of oxalates. Ozawa and Coats & Redfern methods were used to determine the apparent activation energies of material degradation. The apparent activation energies for barium oxalate crystals were obtained 187.42 KJ·mol-1 and 185.4 KJ·mol-1 for the respective methods.
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