Ceramics-Silikáty 21, (1) 13 - 18 (1977) |
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TEMPERATURE DEPENDENCE OF STANDARD GIBBS ENERGY FOR THE REACTION 2/3 CaCr₂O₄ ↔ 2/3 CaO + 4/3 Cr + O₂
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Havlica Jaromír, Pánek Zdeněk
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Institute of Inorganic Chemistry Slovak Academy of Sciences, 809 34 Bratislava, Dúbravská cesta 5
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Decomposition of calcium chromite was studied in the temperature range of 1473 to 1973 K in an atmosphere of carbon monoxide and carbon dioxide mixed in various proportions. Phase analysis was employed in the evaluation of the temperatures and the corresponding oxygen partial pressures pO₂ at which the first particles of chromium metal arise. The results obtained were used for calculating the standard Gibbs energy ΔG⁰ of the reaction within the above temperature interval. The temperature dependence can be expressed by the following equation: ΔG⁰ = -165.2 x 10-3T + 790.0 [kJmol-1]. |
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