How to find time constant from EIS curves ? How I can optain the operating frequency from the Nyquist plot?

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Kiruba M S

Hi Emad S. Goda , please elaborate your experiment. For what you want to find time constant?

Emad S. Goda

Relaxation time

John Reye

I saw that someone had prior asked basically the same thing below and another answer was given at the time. Hope this helps.

Karthikeyan Rangasamy

12.16
Gandhigram Rural Institute

How to calculate relaxation time from electrical impedance spectroscopy (EIS) technique?Question

Asked May 15, 2017

can anyone suggest me how to calculate the relaxation time from electrical impedance spectra. is it possible calculate relaxation time by running in different frequencies or different temperature?

Maxim Sumets added an answer May 16, 2017

It depends on the representation of your impedance spectra and the frequency range. If you plot Im(Z) vs. omega graph and you have a maximum (not always of course observable), the maximum frequency corresponds a relaxation time (t=1/omega). There are another representation like Bode diagram where it can be derived from the break points. Try to find the following book comprehensive :"Impedance Spectroscopy" by J. Ross Macdonald. http://www.wiley.com/WileyCDA/WileyTitle/productCd-0471647497.html