Computer Science
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45..529w&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 45, Issue 4, pp.529-534
Computer Science
30
Scientific paper
The enthalpies of solution of synthetic Mg 2 SiO 4 -Fe 2 SiO 4 olivine solid solutions have been measured in Pb 2 B 2 O 5 melt at 970 K. The heat of solution of forsterite was found to be 15.62 ± 0.3 kcal mol -1 and that of fayalite 9.39 ± 0.14 kcal mol -1 . Solid solutions between these end-members exhibit small positive deviations from mixing ideality, asymmetric towards the Fe end-member. In terms of the sub-regular solution model, excess enthalpies of intermediate olivine are adequately represented by the equation H xs = 2(1000 + 1000 X Fe ) X Fe X Mg The enthalpies of solution at 970 K are consistent with high temperature phase equilibrium measurements of activity-composition relationships in the olivine series. Excess entropy terms are not needed to relate the phase equilibrium data to the calorimetric data presented here. The enthalpy of solution of FeSiO 3 ferrosilite at 970 K was found to be 4.36 ± 0.10 kcal mol -1 . This value, when taken together with calorimetric measurements on fayalite and quartz, is consistent with phase equilibrium investigations of the reaction: 2 FeSiO 3 = Fe 2 SiO 4 + SiO 2 Ferrosilite Fayalite Quartz These provide a check on the internal consistency of the calorimetric data presented here.
Kleppa O. J.
Wood Bernard J.
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