Journal ArticleDOI
Thermodynamics and phase relationships of transition metal-sulfur systems: Part III. Thermodynamic properties of the Fe-S liquid phase and the calculation of the Fe-S phase diagram
R. C. Sharma,Y. A. Chang +1 more
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In this article, an associated solution model is applied to describe the thermodynamic behavior of Fe-S liquid, assuming the existence of FeS species in addition to Fe and S in the liquid.Abstract:
An associated solution model is applied to describe the thermodynamic behavior of Fe-S liquid. This model assumes the existence of ‘FeS’ species in addition to Fe and S in the liquid. With two solution parameters for each of the binaries Fe-‘FeS’ and ‘FeS’-S, this model accounts for the compositional dependence of the thermodynamic properties of Fe-S liquid from pure Fe to pure S over a wide range of temperature. The binary Fe-S does not contribute significantly to the excess Gibbs energy of the liquid due to the rather small dissociation constant of ‘FeS’ to Fe and S. Using this model for the liquid phase and a defect thermodynamic model for the pyrrhotite phase, the Fe-S phase diagram is calculated. The calculated diagram is in excellent agreement with the experimental data, accounting for the range of homogeneity of pyrrhotite at all temperatures. Both the thermodynamic and phase diagram data are obtained from the literature.read more
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Geochemistry of mantle–core differentiation at high pressure
Jie Li,Carl B. Agee +1 more
TL;DR: In this paper, it was shown that the absolute and relative abundances of Ni and Co in the Earth's mantle are consistent with alloy-silicate chemical equilibrium at high pressure, indicating that core formation may have taken place in a magma ocean with a depth of 750-1,100 km.
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A two-sublattice model for molten solutions with different tendency for ionization
TL;DR: In this article, a new model based on Temkin's expression for the configurational entropy of mixing is proposed to describe the variation in the thermodynamic properties in a melt as it gradually changes its composition from purely metallic state to complete ionization.
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Geochemical constraints on core formation in the Earth
John H. Jones,Michael J. Drake +1 more
TL;DR: In this paper, experimental data on the partitioning of siderophile and chalcophile elements among metallic and silicate phases may be used to constrain hypotheses of core formation in the Earth.
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High temperature corrosion in energy systems
Robert A. Rapp,John H. Devan,David L. Douglass,Paul C. Nordine,Frederick S. Pettit,David P. Whittle +5 more
TL;DR: The role of grain boundaries in corrosion product scales as short-circuit transport paths for the outward diffusion of metal and the inward ingress of oxygen, sulfur and carbon needs to be clarified.
References
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Book
Selected Values of the Thermodynamic Properties of the Elements
TL;DR: In this paper, methods of evaluation, atomic weights, fundamental constants, symbols and units, general references, and properties of the elements are presented. But they do not specify the properties of elements.
Journal ArticleDOI
Equilibrium relations between pyrrhotite and pyrite from 325 degrees to 743 degrees C
TL;DR: The pyrrhotite solvus that represents the compositions of pyrhotite coexisting in equilibrium with pyrite was determined in the temperature range 325 degrees C to 743 degrees C by experiments conducted in sealed, evacuated, silica glass capsules as mentioned in this paper.