Electrochemical Determination of Phase Diagrams and Thermodynamic Data of Multi-Component Systems

1980 ◽  
Vol 35 (4) ◽  
pp. 381-388 ◽  
Author(s):  
W. Weppner ◽  
Chen Li-chuan ◽  
W. Piekarczyk
Keyword(s):  
Phase Diagrams ◽  
Coulometric Titration ◽  
Equilibrium Phase ◽  
Cell Voltage ◽  
Electrochemical Determination ◽  
Specific Cell ◽  
Gibbs Energies ◽  
Component Systems ◽  
Titration Technique

Abstract The coulometric titration technique is extended to treat general cases of systems of any number of components. Complete equilibrium phase diagrams and thermodynamic properties are obtained from readily and precisely measurable electrical quantities, employing only a small number of samples. General equations are derived which directly relate the cell voltage to the standard Gibbs energies, enthalpies and entropies of formation of all phases involved without the necessity of considering specific cell reactions. The application of the technique to the ternary system Cu-Ge-O is demonstrated.

Design and Analysis of a High Pressure Apparatus

1980 ◽  
Vol 102 (3) ◽  
pp. 633-640
Author(s):  
K. C. Rolle ◽  
J. N. Crisp ◽  
A. N. Palazotto
Keyword(s):  
Finite Element ◽  
High Pressure ◽  
Phase Diagrams ◽  
High Pressures ◽  
Equilibrium Phase ◽  
Original Design ◽  
Piston Displacement ◽  
Crude Analysis ◽  
High Pressure Apparatus

In the determination of equilibrium phase diagrams, i.e., pressure volume-temperature relations for lubricants at pressures up to 2800 MPa and temperatures of 378K, one must carry out a highly sophisticated design of a high pressure apparatus. In 1935 Bridgman designed a piston-displacement device and measured the compressibility of numerous materials at high pressures. However, in order to obtain accurate equilibrium phase diagrams for lubricants, Bridgman’s relatively crude analysis must be considerably refined. The authors have extended this original design using finite element techniques to accurately correct pertinent measurements which are in turn incorporated into the expressions used in determining the pressure-volume temperature relations of lubricants.

Equilibrium Phase Diagrams for Analysis of the Oxidation of III-V Compound Semiconductors

1989 ◽  
Vol 148 ◽  
Author(s):  
G. P. Schwartz
Keyword(s):  
High Pressure ◽  
Phase Diagrams ◽  
Equilibrium Phase ◽  
Compound Semiconductors ◽  
Growth Conditions ◽  
Pressure Oxidation ◽  
Recent Interest ◽  
Equilibrium Growth ◽  
Thermodynamic Factors

ABSTRACTThe phases which result from the oxidation of III-V compound semiconductors can be predicted from a knowledge of the condensed phase portion of their equilibrium phase diagrams. Examples will be shown for arsenides, antimonides, and phosphides. Use of these diagrams explicitly presumes equilibrium growth conditions, and that assumption often fails. In such cases kinetic rather than thermodynamic factors dominate the determination of the observed phases. Examples of this phenomenon for anodic oxidation will be presented. Recent interest in high pressure oxidation conditions as a means of alleviating kinetic limitations will be discussed for InP. The phase diagrams can also be used to predict interfacial reactions under certain conditions and data for GaAs will serve to illustrate this point.

Experimental determination of solid-liquid-liquid equilibrium phase diagrams

AIChE Journal ◽  
2007 ◽  
Vol 53 (6) ◽  
pp. 1608-1619 ◽  
Author(s):  
Sau M. Lai ◽  
Mai Y. Yuen ◽  
Leo K. S. Siu ◽  
Ka M. Ng ◽  
Christianto Wibowo
Keyword(s):  
Experimental Determination ◽  
Phase Diagrams ◽  
Equilibrium Phase ◽  
Liquid Equilibrium ◽  
Solid Liquid

scholarly journals Thermodynamic calculations in alloys Ti-Al, Ti-Fe, Al-Fe and Ti-Al-Fe

2008 ◽  
Vol 44 (1) ◽  
pp. 49-61 ◽  
Author(s):  
Ana Kostov ◽  
B. Friedrich ◽  
D. Zivkovic
Keyword(s):  
Phase Diagrams ◽  
Ternary Alloy ◽  
Ternary Systems ◽  
Thermodynamic Calculations ◽  
Calculated Phase ◽  
Gibbs Energies ◽  
Different Temperatures ◽  
Binary And Ternary Systems ◽  
Thermodynamic Determination

Thermodynamic calculations of three binary Ti-based alloys: Ti-Al, Ti-Fe, and Al-Fe, as well as ternary alloy Ti-Al-Fe, is shown in this paper. Thermodynamic calculations involved thermodynamic determination of activities, coefficient of activities, partial and integral values for enthalpies and Gibbs energies of mixing and excess energies at different temperatures: 1873K, 2000K and 2073K, as well as calculated phase diagrams for the investigated binary and ternary systems. The FactSage is used for all thermodynamic calculations.

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