The following impedance spectra were acquired at 270 C (closed circles) and 25 C (open circles) for NASICON, a Na+ solid state ceramic electrolyte. Frequency: 5Hz - 13 MHz, NASICON thickness = 1mm, NASICON area = 1 cm2.
a. Describe the type of electrode used in the cell and draw an equivalent circuit for the cell.
b. Calculate the ionic conductivity of NASICON at 25°C.