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# Self-diffusion

According to the 2nd edition of the IUPAC Compendium of Chemical Terminology (1997), self-diffusion coefficient is the diffusion coefficient $D_i^*$ of species i when the chemical potential gradient equals zero. It is linked to the diffusion coefficient Di by the equation:

$D_i^*=D_i\frac{\partial\ln c_i}{\partial\ln a_i}.$