Diffusion-controlled work function changes of (La,Sr)MnO3

This paper considers the mechanism of oxygen interaction with the surface o f oxide electrode materials, such as LSM, and surface related electrical pr operties. The mechanism involves rapid oxygen chemisorption, resulting in a n increase of the surface charge, followed by a slow oxygen incorporation, resulting in a shift of chemisorption equilibria and leading, in consequenc e, to a decrease of the surface charge. The latter process, involving trans ient chemisorption, is controlled by chemical diffusion. A good agreement b etween the chemical diffusion coefficient determined from work function and that determined by the manometric is revealed. (C) 1999 Elsevier Science B .V. All lights reserved.