Samples of La1.9Sr0.1NiO4 and La2NiO4 were prepared with an O excess of up to 0.24. The O tracer-diffusion coefficients and surface exchange coefficients of the materials were determined by using the isotope-exchange depth-profiling method. The La2NiO4 was found to exhibit an O diffusivity which was higher than that of La0.6Sr0.4Co0.2Fe0.8O3 and an order of magnitude lower than that of the best perovskite oxide-ion conductor, La0.3Sr0.7CoO3.

Oxygen Diffusion and Surface Exchange in La2-xSrxNiO4. S.J.Skinner, J.A.Kilner: Solid State Ionics, 2000, 135[1-4], 709-12