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The electrical conductivity of La 0.5- x  Sr 0.5 FeO 3- δ  , investigated as a function of the nominal cation deficiency in the A-sublattice, x , varying from 0 to 0.02, has demonstrated a nonlinear dependence. An increase in the x value from 0 to 0.01 resulted in a considerable increase in electrical conductivity, which was shown to be attributed mainly to an increase in the mobility of the charge carriers. A combined analysis of the defect equilibrium and the charge transport in La 0.5- x  Sr 0.5 FeO 3- δ  revealed the increase in the mobility of oxygen ions, electrons, and holes by factors of ~1.5, 1.3, and 1.7, respectively. The observed effect is assumed to be conditioned by a variation in the oxide structure under the action of the cationic vacancy formation. It was found that the cation deficiency limit in La 0.5- x  Sr 0.5 FeO 3- δ  did not exceed 0.01. A small overstep of this limit was shown to result in the formation of (Sr,La)Fe 12 O 19 impurity, which even in undetectable amounts reduced the conductivity of the material. The presence of (Sr,La)Fe 12 O 19 impurity was revealed by X-ray diffraction on the ceramic surface after heat treatment at 1300 °C. It is most likely that the formation of traces of the liquid phase under these conditions is responsible for the impurity migration to the ceramic surface. The introduction of a cation deficiency of 0.01 into the A-sublattice of La 0.5- x  Sr 0.5 FeO 3- δ  can be recommended as an effective means to enhance both the oxygen ion and the electron conductivity and improve ceramic sinterability.

Impact of A-Site Cation Deficiency on Charge Transport in La0.5−xSr0.5FeO3−δ