The model is described in: M. Margules, Über die Zusammensetzung der gesättigten Dämpfe von Mischungen, Sitzungsber. Akad. Wiss. Vienna, 1895, Vol. 104, p. 1293. A modern description is found in Bruce E. Poling, John M. Prausnitz, John P. O'Connell, The Properties of Gases and Liquids, 4th ed., (New York: McGraw-Hill, 2001).
GEX/(R×T) = Σai×x1×x2×(x1 - x2)i, where the summation is from i = 0 to nTerms.
Parameters determined in TDE are the a vector.
Temperature dependences for activity-coefficient model parameters are expressed with: TDE-TSeries1.
Details of the model implementation in TDE, including ThermoML-Equation representation are available. (See the ThermoML web site for details of this IUPAC communication standard.)