Electrical Conduction Mobility, Conductivity and Random Walk

In the pure electrical experiment we measure the conductivity which can be broken down into contributions of ions and electrons and finally into the defect contributions (k conduction electron, hole vacancy, interstitial) 

In Part II1 we will become acquainted with methods to de-convolute ionic and electron conductivity. According to Table 4 ay can be broken down into charge number, concentration and mobility according to 

Equation (111) follows from the fact that the potential gradients and flux densities in Eq. (103) are invariant against the substitution ion O defect. Hence cr is invariant ( rk = o]on) and so is the product DC. (The generalization is given by Eqs. 150 and 151.) 

Let us discuss in the following some fundamental aspects of the mobility of ions and electrons and consider specific conductors. 

Interstitial ions (z = -Zv) are either transported directly (see Fig. 42 center) according to 

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