METAL OXIDE FILM, OXYGEN SENSOR, OXYGEN PERMEABLE FILM AND SOLID OXIDE FUEL CELL

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PROBLEM TO BE SOLVED : To provide a metal oxide film capable of adjusting oxygen permeability under oxygen potential gradient, and also to provide an oxygen sensor having the metal oxide film, an oxygen permeable film and a solid oxide fuel cell. SOLUTION : The metal oxide film has a grain boundary which is a boundary of crystal grains, and a rare earth element is segregated on the surface thereof and at the grain boundary. The rare earth element is at least one kind of Y, Sm, Eu, Tm and Lu. Moreover, the oxygen sensor includes the metal oxide film. Furthermore, the oxygen permeable film includes the metal oxide film. Moreover, the solid oxide fuel cell includes a solid electrolyte body having the metal oxide film. COPYRIGHT : (C)2012, JPO&INPIT