Abstract
The oxygen ionic conductivity of determined by the oxygen permeation, faradaic efficiency, and total conductivity measurements at 1023-1223 K, is essentially independent of oxygen chemical potential and structural changes in the wide oxygen partial pressure range from to 0.21 kPa. At oxygen pressures close to atmospheric air, the ion transference numbers of perovskite-like phases vary from to increasing with gallium content and temperature. Although there is a great difference between ionic and p-type electronic conductivities in oxidizing atmospheres, the electron-hole conduction was demonstrated to affect oxygen permeation and ambipolar conductivity. In oxidizing conditions, the oxygen permeability of membranes increase with increasing The bulk ionic transport process and surface exchange kinetics both influence the permeation through ceramics, whereas the oxygen fluxes through Ga-containing materials are predominantly determined by the bulk ambipolar conduction. Thermal expansion coefficients of in air vary in the range at 300-800 K and increase up to at 800-1170 K. Substitution of iron with gallium was found to suppress both thermal expansion and chemically induced expansion of materials, originating from oxygen nonstoichiometry variations under changing the oxygen partial pressure. © 2002 The Electrochemical Society. All rights reserved.
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