Co-firing of a La0.8Sr0.2MnO3-δ (LSM)-gadolinium doped ceria(GDC)/GDC/NiO-GDC cell is investigated by the application of a mixed GDC powder. A fine starting GDC powder is synthesized by the homogeneous precipitation process, using hexamethylenetetramine (HMT), and mixed with a commercially available GDC powder. Shrinkage behavior of the chemically prepared, the commercial, and the mixed GDC powders is examined by thermo-mechanical analysis (TMA), which suggests that the mixed powder has good sinterability and compatible shrinkage with electrodes. A LSM-GDC/GDC/NiO-GDC cell prepared by lamination of electrode and electrolyte green sheets is co-fired at 1300°C for 4 h. The prepared fuel cell gives an output power density of 0.35 W/cm 2 at 600°C.
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