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SEM images: (a) grain surface of a stoichiometric pure ceria pellet; (b) grain surface of pure ceria pellet reduced to δi = 0.034; (c) grain surface of a stoichiometric 10 mol % Gd doped ceria pellet; and (d) grain surface of a stoichiometric 10 mol % Gd doped ceria pellet reduced to δi = 0.03.
