Focke, Walter Wilhelm2011-08-052011-08-052009-04Focke, WW 2009, 'Weighted-Power-Mean mixture model for the Gibbs energy of fluid mixtures', Industrial and Engineering Chemistry Research, vol. 48, no. 11, pp. 5537-5541.0888-5885 (print)1520-5045 (online)10.1021/ie900083hhttp://hdl.handle.net/2263/17005A continuous family of excess Gibbs free energy expressions is derived based on the double-weighted power mean mixture model and concepts from cubic equations of state. This family has two types of parameters: The model form is determined by two power indices, whereas the matrix of binary coefficients characterizes pure component behavior and binary interactions. It is shown that the Porter, Margules, and Wassiljewa composition dependence are but special forms of this more general expression. In particular, the Wassiljewa Gibbs free energy form turns out to have the same composition dependence as the nonrandom two-liquid (NRTL) equation.en© 2009 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Industrial and Engineering Chemistry Research, copyright © American Chemical Society after peer review and technical editing by the publisher.Gibbs free energyDouble -weighted powerCubic equationsPure component behaviorBinary interactionsMixturesGibbs' free energyChemical equilibriumBinary systems (Metallurgy)Postprint Article