Thermochemical Data on Mineral Phases: The System CaO-MgO-Al2O3-SiO2 |
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| Authors: | SAXENA SURENDRA K; CHATTERJEE NILANJAN |
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| Institution: | Department of Geology, Brooklyn College Brooklyn, New York 11210 and Department of Earth and Environmental Sciences, Graduate School, The City University of New York New York, New York 10036 |
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| Abstract: | Thermochemical data on several phases forming in the systemCaO-MgO-Al2O3-SiO2 have been tested for consistency in reproducingexperimental phase equilibrium relationships. Calorimetric dataon enthalpy, entropy and heat capacity have been adjusted withinexperimental errors and new data on some phases have been estimatedusing phase equilibrium data. The consistency of the data inreproducing phase equilibrium relations in the multicomponent-multiphasesystems has been tested by computing phase diagrams using themethod of minimization of total Gibbs free energy. The recentcalorimetric data on most phases can be used without any significantchange except for phases that show cation disorder. Disordercorrections have been added to the heat capacity data on gehlenite,anorthite, spinel and Ca-Tschermak. |
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