Relationship between Ionic Conductivity and Diffusion Coefficient

2 Relationship between Ionic Conductivity and Diffusion Coefficient 

If both ionic conductivity and ionic diffusion occur by the same random-walk mechanism, a relationship between the self-diffusion coefficient, D, and the ionic 

This equation shows that it is possible to determine the diffusion coefficient from the easier measurement of ionic conductivity. However, Da is derived by assuming that the conductivity mechanism utilizes a random-walk mechanism, which may not true. 

The correlation factor,/, is defined by the ratio of the tracer diffusion coefficient to the random-walk diffusion coefficient (Section 5.6)  

Taking Da to be equal to Dr (which may not always be correct) allows HR to be equated with the correlation factor  

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