The Figure in the attachment is taken from the following article:
Preparation and characterization of a novel ionic conducting foam-type polymeric gel based on polymer PVdF-HFP and ionic liquid [EMIM][TFSI]
At room temperature, at high f region an incomplete semi-circle in the Nyquist plot can be seen which is hard to fit with standard equivalent circuit model. The AC conductivity can give us a range but how can we find the exact numerical value (DC conductivity), if semicircle is difficult to fit?
Try to plot your data in the log-log scale. There could be a tiny semicircle at high frequencies. The incomplete semicircle could be a sign of ion diffusion (so-called Warburg diffusion element in equivalent circuits). Also plot log Z' and Log Z'' vs log f. Provides a different angle of view on your data.
Try to plot your data in the log-log scale. There could be a tiny semicircle at high frequencies. The incomplete semicircle could be a sign of ion diffusion (so-called Warburg diffusion element in equivalent circuits). Also plot log Z' and Log Z'' vs log f. Provides a different angle of view on your data.
Dear Mr. Brus,
I have made those graphs which show a semi circle at very high frequency region but the semicircle is overlapped with low frequency region. My graph looks similar to graph mentioned in above reference and it is very difficult to fit it with equivalent circuit model. This fitting problem arises an issue in determining DC conductivity.
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