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NiO/Ce 0.8 Gd 0.2 O 1.9−x (NiO/CGO) films with thicknesses between 150 and 800nm were prepared by spray pyrolysis. Average grain sizes were 5–260nm after annealing in air at 600–1200°C. After reduction, the Ni/CGO cermet microstructures were stable up to temperatures of 600°C for grain sizes of 53nm. Nickel coarsening was observed for films with smaller grains. The development...