Electrical conductivity of LaCoxFe1 − xO3 − δ and LaLi0.1CoxFe0.9 − xO3 − δ (0 ≤ x ≤ 0.4) oxides

We have studied the effect of Co and Li concentrations on the phase composition and electrical conductivity of LaCo x Fe 1 − x O 3 − δ and LaLi 0.1 Co x Fe 0.9 − x O 3 − δ perovskite-like oxides synthesized in air at 1470 K. Single-phase materials with an orthorhombic crystal structure were obtained in the range 0 ≤ x ≤ 0.3. The composition dependences of conductivity have a minimum at x c = 0.1 and 0.2, respectively. In the range x > 0.1, the conductivity of LaCo x Fe 1 − x O 3 − δ increases with increasing Co concentration for T > 700 K and decreases for T < 600 K. The conductivity of La(Li 0.1 Co x Fe 0.9 − x )O 3 − δ in the range 0 ≤ x ≤ 0.1 and for x ≥ 0.2 increases with Co concentration throughout the temperature range studied.