Abstract
Oxygen-conducting (La0.2Sr1.8)[Ga(Fe1−x M x)]O5.1±y (M = Cu, Ni) ceramics with brownmillerite structure were studied. It is found that the lattice contracts with an increase in the concentration of nickel cations; this observation indicates the possible presence of cations in the Ni4+ oxidation state and an increase in the total conductivity with substitution of iron with nickel and copper cations (i.e., an increase in electronic conductivity).
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