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Title:The Thermodynamics of Highly Solvated Liquid Metal Solutions
Author(s):Alger, Montgomery Meigs
Department / Program:Chemical Engineering
Discipline:Chemical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Engineering, Chemical
Abstract:The activity coefficient of magnesium has been measured in the two ternary systems Mg-Sb-Bi and Mg-Pb-Bi with an electromotive force cell at 1073 K. The large negative deviations from ideal mixing behavior that are observed in the limiting binary magnesium systems were found to carry over into the ternary systems.
The activity coefficient of titanium has been measured with an EMF cell in the three binary liquid mixtures Ti-Bi, Ti-Sb, and Ti-Sn for titanium concentrations less than 15 atomic percent. All three binary titanium mixtures exhibit large negative deviations from ideal mixing behavior.
Chemical theory has been found to be well suited for representing the abrupt changes that are often observed in the activity coefficient and the partial molar enthalpies of the components in systems that are known to form compounds in the solid phase. A chemical model is presented in which the Gibbs energy is given as a function of temperature and composition. The unusually large negative enthalpies of mixing that are observed in compound forming systems are interpreted with the chemical model as being due to highly exothermic compound forming reactions in the liquid phase. Since the number of moles of compound that form in the liquid phase is a function of temperature, a natural temperature dependence of the heat of mixing is built into the model. Through the composition dependence of the Gibbs energy given by the model the stability function for several compound forming systems has been calculated as a function of temperature.
The chemical model has been extended to multicomponent systems and it has been shown that with a knowledge of the thermodynamic data in the limiting binary systems accurate predictions of the activity coefficients in multicomponent systems are possible as a function of temperature and composition.
Issue Date:1982
Type:Text
Description:251 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1982.
URI:http://hdl.handle.net/2142/69726
Other Identifier(s):(UMI)AAI8209538
Date Available in IDEALS:2014-12-15
Date Deposited:1982


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