Measurement of Electronic Conductivity in Fe‐Doped β‐Alumina

Abstract

Electronic conductivity in Fe‐doped β‐alumina containing up to 40 w/o Fe has been measured using four techniques: (i) two‐electrode a‐c (complex impedance), (ii) two‐electrode d‐c, (iii) four‐electrode d‐c, and (iv) Wagner polarization using electrodes. The first three techniques gave consistent results while the Wagner polarization method gave values about two orders of magnitude higher. Complex impedance measurements following the Wagner method showed that the electronic conductivity had indeed increased significantly demonstrating that contact with induced an electronic conductivity that slowly decayed with time. Electronic conductivity increased rapidly with Fe content reaching (10−2 S‐cm−1 by Wagner polarization method) at 40 w/o Fe.