An equation was derived which related the chemical diffusion coefficient to the tracer diffusion coefficients and the electric conductivity. In order to check the validity of this equation, sectioning and flame spectrophotometric measurements were made of the chemical diffusion coefficient and the contact method was used to determine the tracer diffusion coefficient of 42K (figures 22 and 23).

W.Müller, H.Schmalzried: Zeitschrift für Physikalische Chemie, 1968, 57[3-6], 203-17

Figure 22

 Chemical Diffusion in KxRb1-xCl 

  Figure 23

Diffusion of 42K in KxRb1-xCl at 660C