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I am familiar with the following process for calculating conductivity from a Nyquist plot:

  1. Run impedance on potentiostat
  2. Plot - Imaginary Z vs Z
  3. Generate equivalent circuit
  4. Fit data
  5. Calculate conductivity by entering the resistance value, thickness, and diameter of sample

My confusion is that, in the past, my spectra always had a semicircle. Now I am running samples which are giving basically a 45 degree line that starts to the right of 0 on the X axis. I believe I have an equivalent circuit (Resistor + Constant Phase Element/Resistor + Warburg element). My question is, are you able to calculate conductivity as long as you can extrapolate the resistance? In other words, if you have an equivalent circuit which contains a resistor, can you always calculate the conductivity? Or do you need a semi-circle? Thanks.

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    $\begingroup$ Interesting question. I guess most of chemists do not consider the complex impedance or admittance. $\endgroup$
    – Poutnik
    Commented Jun 3, 2022 at 9:49

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