Volumetric Behavior of Liquid Metals and Alloys (Density)
Lira, Carl Thomas
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https://hdl.handle.net/2142/69769
Description
Title
Volumetric Behavior of Liquid Metals and Alloys (Density)
Author(s)
Lira, Carl Thomas
Issue Date
1986
Department of Study
Chemical Engineering
Discipline
Chemical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Chemical
Abstract
A new relationship between the configurational energy, the valence, and the interatomic distance is presented for liquid metals. The significance of the excess volume of mixtures is discussed, and the importance of thermodynamic modelling including excess volumes is stressed.
The relationship between charge transfer and volumetric changes upon mixing is considered. A new two-fluid mixture model is proposed, which is based upon the internal pressure, ((delta)E/(delta)v)T, and the extension of the concepts of Hildebrand's regular solution theory.
Modelling of the internal pressure of pure metals is considered using a nealy free electron model. The structure is found to be extremely important in the representation of the temperature dependence of the internal pressure.
Thermodynamic modelling of compound-forming systems is reviewed and a new chemical theory model is proposed which has only two adjustable parameters for both chemical and physical interactions. The number of parameter has been reduced significantly by applying the concepts of group contribution theory. Modelling of the excess volumes of compound-forming alloys is also developed using a chemical theory approach.
New experimental measurements are reported for the molar volumes of pure lead and zinc at high temperature, where few literature data exist. The data were obtained using a direct Archimedes' technique.
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