Thermal decomposition of potassium cobalt hexacyanoferrate(II) |
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Authors: | J. Lehto S. Haukka |
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Affiliation: | University of Helsinki, Department of Radiochemistry, Unioninkatu 35, 00170 Helsinki Finland Technical Research Centre of Finland, Concrete and Silicate Laboratory, Betonimiehenkuja 5, 02150 Espoo Finland University of Helsinki, Department of Physics, Siltavuorenpenger 20 D, 00170 Helsinki Finland |
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Abstract: | Potassium cobalt hexacyanoferrate(II), K2CoFe(CN)6 · 1.4H2O, loses its water when heated up to 170°C, and the anhydrous compound begins to decompose above 230°C. The cyanide groups are evaporated off in the temperature range 230–350°C, and the solid products thus formed are K2CO3, Fe2O3, Co3O4 and CoFe2O4. In the range 550–900°C, the cobalt-containing compounds become CoO, and K2CO3 probably partly decomposes to K2O, so that the product mixture at 900°C is K2CO3/K2O, Fe2O3 and CoO. Above this temperature, K2CO3 decomposes to K2O. |
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