Collect. Czech. Chem. Commun. 1989, 54, 892-899

Oscillations of concentrations in multicomponent diffusion

Jozef Kvasnica

Department of Mathematical Physics, Charles University, 180 00 Prague 8


While selfdiffusion coefficients Dii are always positive, the stability conditions admit both signs of the interdiffusion coefficients Dij (ij). 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.