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The Gibbs Energy Basis and Construction of Melting Point Diagrams in Binary Systems
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Abstract
Melting point diagrams for binary systems are classified into types depending on the extent of miscibility in the liquid and solid states and the existence of maximum or minimum temperatures. The presence of intercomponent compounds or of polymorphism of the components is excluded. Quantitatively, the diagrams are determined mostly by the melting points of the components, their enthalpies of fusion, and the extent of the deviations from ideality of the liquid and solid solutions as expressed by the excess Gibbs energies or activity coefficients of the components. For simplicity, with little sacrifice of accuracy, most of the liquid and solid solutions are treated as regular ( only one parameter being needed to express the deviations from ideality) and the excess entropies of mixing assumed to be zero. Given such data one can, for each type, determine the corresponding diagram. The detailed procedures for doing so are illustrated, and the necessary data for fifteen real and fictitious examples of the various types are provided for further exercise.
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Keywords (Audience):
Graduate Education / ResearchKeywords (Domain):
Physical ChemistryKeywords (Subject):
Phases / Phase Transitions / DiagramsCiting Articles
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This article has been cited by 1 ACS Journal articles (1 most recent appear below).
The Gibbs Energy Basis and Construction of Boiling Point Diagrams in Binary Systems
Norman O. SmithJournal of Chemical Education2004 81 (3), 419The Gibbs Energy Basis and Construction of Boiling Point Diagrams in Binary Systems
Norman O. SmithJournal of Chemical Education2004 81 (3), 419Following an earlier paper (J. Chem. Educ. 1997, 74, 1080-1084) on binary melting point diagrams, a method of constructing boiling point diagrams for each of the kinds of behavior of binary miscible liquid pairs (those without an azeotrope, those with a ...
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- Received: August 03, 2009
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