The extended affinity

The deviation from equilibrium is described by the affinity expressed by using the chemical potentials. It leads to difficulties at describing the processes for which the use of the chemical potentials is problematic. The extended affinity suitable to consider the processes in the systems with alloys of compounds with two or more mixed sublattices is represented. This affinity reduces to the conventional affinity for the simpler systems for which the use of the chemical potentials is not problematic. The extended affinity makes possible the consideration of a wider class of processes.