Gibbs free energy and activity coefficients from total pressure measurements

1970 ◽  
Vol 48 (5) ◽  
pp. 501-504 ◽  
Author(s):  
D. C. Minh ◽  
M. Rvel
Keyword(s):  
Free Energy ◽  
Gibbs Free Energy ◽  
Activity Coefficients ◽  
Total Pressure ◽  
Pressure Measurements

Activity coefficients and excess Gibbs’ free energy of some binary mixtures formed by p-cresol at 95.23kPa

2007 ◽  
Vol 39 (7) ◽  
pp. 1022-1026 ◽  
Author(s):  
T.E. Vittal Prasad ◽  
N. Venkanna ◽  
Y. Naveen Kumar ◽  
K. Ashok ◽  
N.M. Sirisha ◽  
...  
Keyword(s):  
Free Energy ◽  
Gibbs Free Energy ◽  
Binary Mixtures ◽  
Activity Coefficients ◽  
Excess Gibbs Free Energy

Activity coefficients of NaNO3 in (Mg, Ca, Sr, and Ba)(NO3)2 + H2O systems at 298 K by EMF methods

1993 ◽  
Vol 71 (3) ◽  
pp. 384-389 ◽  
Author(s):  
Stephen N. Smith ◽  
S. Sarada ◽  
Ramamurthy Palepu
Keyword(s):  
Free Energy ◽  
Ionic Strength ◽  
Gibbs Free Energy ◽  
Activity Coefficients ◽  
Interaction Parameters ◽  
Excess Gibbs Free Energy ◽  
Experimental Activity ◽  
Energy Of Mixing ◽  
Total Ionic Strength ◽  
Free Energy Of Mixing

The activity coefficients of NaNO3 in Mg(NO3)2, Ca(NO3)2, Sr(NO3)2 and Ba (NO3)2 were determined at constant total ionic strength of 0.1, 0.5, 0.75, 1.0, 1.5, and 2.0 mol kg−1 at 298 K using EMF methods. The experimental activity coefficients were analyzed using four different formalisms, namely, Reilly–Wood–Robinson, Scatchard, Pitzer, and Harned equations, and the interaction parameters were evaluated. Excess Gibbs free energy of mixing and trace activity coefficients were calculated and the results are discussed.

Determination of Activity Coefficients from total pressure measurements

1953 ◽  
Vol 6 (3) ◽  
pp. 207 ◽  
Author(s):  
JA Barker
Keyword(s):  
Least Squares ◽  
Activity Coefficients ◽  
Vapour Pressure ◽  
Total Pressure ◽  
Pressure Measurements ◽  
Method Of Least Squares ◽  
Determination Of Activity

A method of least squares is described for calculating activity coefficients from results of total vapour pressure measurements.

Thermodynamic Parameters Analysis of MgS Superfine Inclusion in Grain Boundary

2012 ◽  
Vol 217-219 ◽  
pp. 174-178
Author(s):  
Shao Bo Zheng ◽  
Chun Feng Wu ◽  
Cun Bo Yang ◽  
Yue Gong ◽  
Hui Gai Li
Keyword(s):  
Free Energy ◽  
Grain Boundary ◽  
Thermodynamic Parameters ◽  
Gibbs Free Energy ◽  
Free Volume ◽  
Activity Coefficients ◽  
Plate Steel ◽  
Miedema Model ◽  
Free Volume Theory ◽  
Parameters Analysis

Activity coefficients and concentrations of dissolved magnesium and sulfur in grain boundary are two essential parts for the calculation of the Gibbs free energy of MgS superfine inclusion in grain boundary. Activity coefficients of dissolved magnesium and sulfur in grain boundary are gained first by the use of Miedema Model and Free Volume Theory. Concentrations of dissolved magnesium and sulfur in grain boundary of Fe-matrix are gained by Mclean’s equation. At last the Gibbs free energy of MgS in grain boundary is -14.048KJ/mol in E-class ship plate steel at T=1363K. By comparing the values of the Gibbs free energy of MgS in grain boundary and that in grain interior, a conclusion can be come to that MgS superfine inclusions may form in grain boundary instead of in grain interior.

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