Thermodynamic calculations on phase equilibria involving fused salts; Part 2, Solid solutions and application to the olivines

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ID: 295094
1962
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Abstract
A theory is developed for ideal solutions of ionic salts giving Roozeboom Type I phase diagrams, based on the assumption that the mole fraction of an ion in a phase is equal to the number of specified ions present divided by the total number of ions of all species in the phase. When applied to solid solutions of fayalite and forsterite the theory predicts for the components heats of fusion, 25,200 and 29,300 cal mole (super -1) respectively, which differ considerably from the value, 14,000 cal mole (super -1) for each component, calculated by Bowen and Schairer, who assumed ideal behavior for the undissociated molecules. Orr found a calorimetric heat of fusion of 22,000 cal mole (super -1) for fayalite. When applied to solid solutions of Mg ~2~ SiO ~4~ and Mg ~2~ GeO ~4~ , where there is a common cation, the theory predicts that ideal solution theory for undissociated molecules may be used. The data of Ringwood for this system show, however, practically no separation between liquidus and solidus, and do not admit of the calculation of heats of fusion. The behavior of the system Mg ~2~ GeO ~4~ +Fe ~2~ SiO ~4~ with no common ion is predicted. Mg ~2~ SiO ~4~ and Mn ~2~ SiO ~4~ , with a common anion, behave like forsterite and fayalite.
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Authors R. S. Bradley
Journal american journal of science
Year 1962
DOI
10.2475/ajs.260.7.550
URL
https://ajs.scholasticahq.com/article/58930.pdf
Keywords Keywords not found

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