Abstract
The ionic conductivity in mixed ionic electronic conductors (MIECs) is usually determined by a polarization technique analogous to the Hebb-Wagner polarization method used for determining the electronic (electron/hole) conductivity. However, this technique has some experimental difficulties which may render the results useless. These difficulties are discussed and examples are presented. A new method is presented, which is denoted as the “zero driving force” technique. In this method the electronic current is eliminated by short circuiting, thus eliminating the driving force acting on the electrons/holes. This new technique does not suffer from the drawbacks of the polarization method. It is shown that MIEC probes can be used to transfer μ e and μ i information. Two voltemeters connected to MIEC probes applied to an MIEC sample can be used to measure Δ μ e and Δ μ i . This measurement is simultaneous and refers to the same two contact points. However, reversible probes cannot generally be tolerated on MIECs in the one-dimensional configuration.
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