Oxygen permeability of LaFe1−xNixO3−δ solid solutions

Incorporation of nickel into the iron sublattice of LaFeO3−δ was found to result in increasing oxygen nonstoichiometry, electrical conductivity, and thermal expansion of the perovskites. Activation energy for electrical conductivity of the LaFe1−xNixO3−δ (x = 0.2–0.5) decreases with x in the range from 23.9 to 6.6 kJ/mol. Thermal expansion coefficients of the ceramic materials calculated from the dilatometric data were (8.9–11.9) × 10−6 K−1. Oxygen permeation through LaFe1−xNixO3−δ membranes was found to increase with nickel content due to increasing oxygen vacancy concentration and bulk ionic conductivity, which are the permeation flux-limiting factors.