I measured the impedance of concrete experimentally with a spectrometer and tried to find the conductivity of the moist concrete sample. I plot the conductivity curve with respect to frequency, however, the curve shows negative conductivity. How to explain the curve?
AC circuit components not always pure ohmic, but can behave like inductor or capacitor, depending on the frequency. Around resonance, inducted current can have a pi phase shift compared to the applied voltage, results in reverse current, hence you measure negative conductivity.
Dear Gabor Kurdi ,
I thank you for explaining the question nicely.
This indicates a resonance process, after which high frequency parasitic inductance takes over the capacitive behavior. There are other papers and interesting explanations that report similar observations:
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Dear Souvik Bhattacharjee,
many thank for explaining the question and also for the literature.
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