Ceramic samples Diffusion in gases 1 Diffusion profiles 1 Grain and twin boundaries 1 Grain boundaries 1 Grain-boundaries 1 Grain-boundary diffusion 1 Iron compounds 1 La0.6sr0.4co0.2fe0.8o3 1 Lanthanum compounds 1 Measurements of 1 Mixed ionic-electronic conductors 1 Oxygen 1 Oxygen diffusion 1 Oxygen diffusivity 1 Strontium compounds 1