Oscillations of concentrations in multicomponent diffusion
Jozef Kvasnica · Collection of Czechoslovak Chemical Communications · 1989
While selfdiffusion coefficients Dii are always positive, the stability conditions admit both signs of the interdiffusion coefficients Dij (i ≠ j). In a multicomponent system (n > 2) with opposite signs of interdiffusion (at least within some range of concentrations and temperatures) there might occur anomalous evolution of concentrations, e.g. the damped oscillations of extremal values for some x2/t.