Oxygen-ion and electron conductivity in Sr-2(Fe1-xGax)(2)O-5статья
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Аннотация:High-temperature electrical conductivity measurements, structural data from powder X-ray diffraction and Fe-57 Mossbauer spectroscopy were combined to study the interrelationship of oxygen ion transport and p- and n-type transport in Sr-2(Fe1-xGax)(2)O-5, where x = 0. 0.1 and 0.2. Although gallium substitution generally decreases the total ion-electron transport, the transition of the orthorhombic brownmillerite structure to a cubic phase on heating results in the recurrence of the conductivity to the same high level as in the parent ferrite (x = 0). The changes of the partial contributions to the total conductivity as a function of x are shown to reflect a complicated interplay of the disordering processes that develop in the oxygen sublattice on heating in response to replacement of iron with gallium. (c) 2006 Elsevier Inc. All rights reserved.