Impedance Spectra of Unusual Two-phase Systems

In a volume such as this, most examples are unavoidably drawn from systems that are fairly well understood. As a counter-balance, two examples are mentioned that are, in some way, unusual. 

The grain boundary and electrode features are associated with Warburg components of 3 x 10 cm s and 1.3 x lO S cm s respectively. The known properties of the zirconia phase do not, however, fit such an interpretation the resistivity, extrapolated from higher temperature is at least lO Qcm. This would suggest 

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