A Direct Method for the Derivation of Thermodynamic Excess Functions fromTXPhase Diagrams

1977 ◽  
Vol 105 (3_4) ◽  
pp. 113-123 ◽  
Author(s):  
N. Brouwer ◽  
H. A. J. Oonk
Keyword(s):  
Direct Method ◽  
Excess Functions ◽  
Thermodynamic Excess Functions ◽  
A Direct Method ◽  
Thermodynamic Excess

Thermodynamische Interpretation der Schmelzdiagramme binärer Systeme aus Methylchlorsilanen und Pyridazin bzw. Pyrazin

1987 ◽  
Vol 42 (4) ◽  
pp. 341-351
Author(s):  
Karl Hensen ◽  
Jens Gaede
Keyword(s):  
Melting Point ◽  
Thermodynamic Functions ◽  
Liquidus Curve ◽  
Optical Measurements ◽  
Miscibility Gap ◽  
Excess Functions ◽  
Cooling Curves ◽  
Acid Base ◽  
Thermodynamic Excess Functions ◽  
Thermodynamic Excess

By analyzing the cooling curves and the resulting melting point diagrams of the chloromethylsilane- pyridazine and pyrazine systems the existence of the incongruently melting addition compounds CH3SiCl3 • Pyridazine, (CH3)2SiCl2 • (Pyridazine)2, (CH3)3SiCl • (Pyridazine)2, CH3SiCl3 • (Pyrazine)2, (CH3)2SiCl2 • (Pyrazine)2 , (CH3)3SiCl • (Pyrazine)2 was proved. By electro-optical measurements of the turbidity point it was proved that the system (CH3)3SiCl- Pyridazine exhibits a miscibility gap which intersects the liquidus curve of the amine. Based on certain approximations it was possible to fit thermodynamic functions to the experimental results to obtain the excess data of mixing of the corresponding systems. These data allow for a more profound understanding of the Lewis-acid base behaviour of the silanes and amines.Chloromethylsilanes, Pyridazine, Pyrazine, Phase Diagrams, Addition Compounds, Thermodynamic Excess Functions

Thermodynamic Excess Functions for Quasiternary Solid Solutions of Type M(X,Y,Z) I. The System Pb (S,Te,Se)

1995 ◽  
Vol 50 (4-5) ◽  
pp. 357-367
Author(s):  
Volkmar Leute
Keyword(s):  
Solid Solutions ◽  
Interaction Parameters ◽  
Miscibility Gap ◽  
Excess Functions ◽  
Free Enthalpy ◽  
Ternary Parameter ◽  
Special System ◽  
Thermodynamic Excess Functions ◽  
Thermodynamic Excess

Abstract The excess free enthalpy of quasiternary systems of type M (X, Y, Z) with two sublattices, a mixed one (X, Y,Z) and a pure one (M), will be described in two ways: (1) by the interaction parameters of the three subregularly treated quasibinary subsystems and by one ternary parameter, and (2) by the cluster energies of 10 pyramidal clusters. It is shown that, for the spinodal miscibility gap in the special system Pb (S, Te, Se), both versions yield satisfying accordance of experiments and calculated results

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