Synthesis of different polymorphic modifications of calcium oxalate by electrodeposition |
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Authors: | Sumy Joseph P Vishnu Kamath |
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Institution: | 1. Department of Chemistry, Central College, Bangalore University, Bangalore, 560 001, India
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Abstract: | Different hydrates of calcium oxalate have been electrodeposited by electrogeneration of acid at the anode from an EDTA-stabilized calcium nitrate bath containing dissolved oxalate ions. The deposition is controlled by varying the bath pH, temperature, and current density. Formation of metastable CaC2O4·2H2O is favored at high current densities at ambient temperature, whereas the thermodynamically stable CaC2O4·H2O is formed at elevated bath temperatures. Both the polymorphs show oriented growth with respect to the substrate normal under different deposition conditions. |
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