Fig. 3. (a) Nyquist plot of the impedance spectrum of CFO@950 measured in the temperature range between −45 and 70 °C (just 60 and 50 °C shown) and the equivalent circuit used to describe the data. Nyquist plot of the impedance spectrum of (b) CFO@950 measured between 290 and 590 °C, and (c) of CFO@400 measured between 125 and 225 °C.
