Thermodynamic mixing behavior of synthetic Ca-Tschermak–diopside pyroxene solid solutions: II. Heat of mixing and activity–composition relationships |
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| Authors: | A Benisek K Etzel L Cemi? |
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| Institution: | 1. Abteilung Mineralogie, Institut für Geowissenschaften, Universit?t Kiel, Olshausenstra?e 40, 24118, Kiel, Germany
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| Abstract: | The heat of mixing for the binary solid solution diopside–Ca-Tschermak was investigated at T = 980 K by lead borate solution calorimetry. A new statistical technique was applied to overcome the problem of using experimental
data of various precisions. A two-parameter Margules model was fitted to the calorimetric data leading to W
CaTs–DiH = 31.3 ± 3.4 kJ mol−1 and W
H
Di–CaTs = 2.4 ± 4.3 kJ mol−1. The results are in good agreement with calorimetric data given in the literature. They agree also with enthalpy data that
were extracted from phase equilibrium experiments. With configurational entropy values taken from the literature, the volume
and the vibrational entropy, presented in Part I of this work, and the enthalpy data of this study, the activity–composition
relationships of the diopside–Ca-Tschermak binary were calculated. |
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| Keywords: | |
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