The incorporation of Ni into the Fe sub-lattice of LaFeO3 was found to result in an increase in O non-stoichiometry and electrical conductivity. The activation energy for conduction in LaFe1-xNixO3, where x was between 0.2 and 0.5, decreased from 23.9 to 6.6kJ/mol as a function of x. The permeation of O through membranes increased with the Ni content (figure 4), due to an increasing O-vacancy concentration and bulk ionic conductivity, which were the permeation-flux limiting-factors.

Oxygen Permeability of La(Fe,Ni)O3 Solid Solutions. V.V.Kharton, A.P.Viskup, E.N.Naumovich, V.N.Tikhonovich: Materials Research Bulletin, 1999, 34[8], 1311-7

Figure 4

Permeation of O Through LaFe1-xNixO3 Membranes at 1223K,

as a Function of O Partial Pressure Differential

(a: x = 0.4, b: x = 0.3, c: x = 0.2, d: x = 0.1)