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TitleAn outline of phase equilibrium
AuthorFroese, E
SourceGeological Survey of Canada, Open File 7057, 2013, 12 pages, (Open Access)
PublisherNatural Resources Canada
Mediaon-line; digital
RelatedThis publication is related to Froese, E; (2006). An outline of reaction equilibrium, Geological Survey of Canada, Current Research (Online) no. 2006-H2
File formatpdf
Subjectsgeochemistry; equilibrium; phase equilibria; chemical analysis; chemical processes; thermodynamics; energy; temperature; pressure-temperature conditions
Illustrationsgraphs; plots; ternary diagrams
ProgramTargeted Geoscience Initiative (TGI-4), Methodological Development
Released2013 04 30
AbstractA collection of systems of different composition defines a composition space which can be described by components defined as the minimum number of combinations of elements in fixed proportion required to express the composition of all phases in the considered systems. At stable equilibrium, and at constant pressure and temperature, each system is characterized by a minimum Gibbs energy G. In the space defined by the components n, there exists a minimum surface. If the compositional variation from system to system is continuous, the change of G along the minimum surface can be described in differential form by (formula) where ñi refers to components other ni. Designating the partial molar Gibbs energy of a component as G, and integrating the expression gives (formula) and division by ni leads to (formula) where G is the molar Gibbs energy and X is the mole fraction of a component. A projection of the minimum molar G surface onto the composition base, in terms of X, results in a phase diagram. 3