Thermodynamic description of the Al–Mg–Si system using a new formulation for the temperature dependence of the excess Gibbs energy

2012 ◽  
Vol 527 ◽  
pp. 131-142 ◽  
Author(s):  
Ying Tang ◽  
Yong Du ◽  
Lijun Zhang ◽  
Xiaoming Yuan ◽  
George Kaptay
Keyword(s):  
Gibbs Energy ◽  
Temperature Dependence ◽  
Excess Gibbs Energy ◽  
Thermodynamic Description ◽  
New Formulation

On Temperature Dependence of Excess Gibbs Energy

1999 ◽  
Vol 64 (7) ◽  
pp. 1093-1099 ◽  
Author(s):  
Ivona Malijevská ◽  
Anatol Malijevský
Keyword(s):  
Heat Capacity ◽  
Gibbs Energy ◽  
Temperature Dependence ◽  
Excess Gibbs Energy ◽  
Excess Enthalpy ◽  
Excess Heat Capacity ◽  
Wilson Equation ◽  
Excess Heat ◽  
Energy Excess ◽  
Wilson And Nrtl Equations

Temperature dependence of GE is discussed for three widely used equations linear and nonlinear in parameters. It is shown that the Wilson equation predicts always positive excess heat capacity regardless of values of its parameters. Several temperature modifications of the Redlich-Kister, Wilson and NRTL equations are discussed with respect to the sign of the excess Gibbs energy, excess enthalpy and excess heat capacity.

Excess Enthalpy in the Systems Nitromethane-Water and Methyl tert-Butyl Ether-Water. Employing Data on Excess Enthalpy for Thermodynamic Description of Heterogeneous Systems

1999 ◽  
Vol 64 (9) ◽  
pp. 1393-1411 ◽  
Author(s):  
Karel Řehák ◽  
Josef P. Novák ◽  
Jana Konetzná ◽  
Andreas Heintz ◽  
Petr Voňka ◽  
...  
Keyword(s):  
Gibbs Energy ◽  
Excess Gibbs Energy ◽  
Excess Enthalpy ◽  
Thermodynamic Description ◽  
Heterogeneous Systems ◽  
Methyl Tert Butyl Ether ◽  
Butyl Ether ◽  
Calculation Of Parameters ◽  
Empirical Relations ◽  
Heterogeneous Region

The excess enthalpies measured in nitromethane-water and methyl tert-butyl ether-water systems at several temperatures are given. The values of the excess enthalpy were determined in both the homogeneous and heterogeneous regions. It is shown how the data for the heterogeneous region can be included in the calculation of parameters of empirical relations for the excess Gibbs energy. It follows from these calculations that the relations for the excess Gibbs energy can be obtained on the basis of the excess enthalpy data measured at several temperatures if the data also cover the heterogeneous region.

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