I want to measure ionic conductivity of my oxide solid-electrolyte so I assembled a half-cell with gold blocking electrodes in Swagelok cell. You can see the EIS result attached. I am confused which part of the semicircle should I take into consideration. Left part or right part? I was taking the intersection point of the semi-circle with the Warburg line on the X axis but in some papers I see people are doing different stuff with fitting etc. Also, what would be the best equivalent circuit to fit this system?
You take the left one, carecteristic of electrolyte. The right one is the electrolyte and charge transfert
Make 3-5 cells with same electrodes and same electrolyte samples but with different thickness: Rct (usually at low frequencies, right part of Z' axis) shouldn't change (it depends on electrodes surface area in contact with electrolyte), but Rs (usually at high frequencies, origin of Z' axis) should change proportionally with electrolyte sample thickness.
Total resistance of solid electroyte (Rt) = Rs + Rct
Orhan Kıbrıslı see the image below
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