Determination of thermodynamic properties of (Fe,Mg)-pyroxenes at 1000 K by the emf method

Details Determination of thermodynamic properties of (Fe,Mg)-pyroxenes at 1000 K by the emf method Determination of thermodynamic properties of (Fe,Mg)-pyroxenes at 1000 K by the emf method

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..85..302s&link_type=abstract

Earth and Planetary Science Letters, Volume 85, Issue 1-3, p. 302-310.

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Emf measurements were made on the cell PtFe,(Fe,Mg)xSi2O6,SiO2(ZrO2)0.85(CaO)0.15Fe,FeOPt at 1000 K. Using the present data, the standard free energy of formation of ferrosilite (compound FeSiO3), from the component oxides FeO and SiO2, is calculated to be -6.35 +/- 0.80 kJ/mol. The activity-composition relation for pyroxene solid solution shows that it has a positive deviation from ideality at 1000 K. The present results are compared with the results of other workers. ΔGmix and ΔGex are calculated and plotted against NFeSiO3.

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