Comparison between the mixture equations

The dc current decay function has been determined experimentally. At low temperature the dc current decay curve of a solid material can given as 

1 Calculate the space charge amount from dc current decay curve 

As described earlier, the space charge (or called surface charge) can be produced through the following mechanisms [7,101] (i) the Debye 

If at /] the current levels off, then the total amount of space charge can be 

Assuming that the cross point between line I and line II is the starting point for the steady current, then h =185.5 s. From line II, t(f) can be estimated as 92.75 //A. Then from Eq.(194), q =4.92x10 C. This is the total charge ever bounded by all particles. Suppose that the surface area of the electrode is A and the gap size between two electrodes is d, then the volume of the sample to be tested is  

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