Figure 2
From: Tracking slab surface temperatures with electrical conductivity of glaucophane
Impedance spectra of the glaucophane at 1.5 GPa. (a) At 725 K, below dehydration temperature of glaucophane (830 K), the impedance arc resembles grain interior processes, which can be modeled with a resistor- constant phase element (R-CPE) circuit. (b) At 853 K, the impedance spectrum shows the development of an inductive loop in response to the dehydration and the presence of fluid in the sample. The equivalent circuit can be represented as an R-CPE with an inductive component (L). The induction at low frequencies can be explained by the adsorption of ionic species in the electrode surface or erosion of electrodes due to fluid phases. (c) Further increase in temperature to 1033 K results in a sudden decrease in sample resistance. The persisting induction loop in impedance spectra indicates a possible reaction of melt with Ni electrodes.
