Abstract
The effects of anode and cathode components on solid-state reaction and sintering characteristics of Ce 0.9Gd 0.1O 1.95 (CGO) electrolyte were investigated in the temperature range from 900 to 1200 °C. The solubility limit of components in the anode was <4 mol% for 1/2Fe 2O 3, <1 mol% for NiO, and <3 mol% for CuO. The solubility limit of components in the cathode was <4 mol% for 1/2La 2O 3, <4 mol% for SrO, and <1 mol% for 1/3Co 3O 4. A small amount of addition of Fe 2O 3, Co 3O 4 or CuO remarkably enhanced the sintering characteristics of the CGO nanopowder. NiO, La 2O 3 or SrO addition lowered. In the case of the mixture of the CGO and La 0.6Sr 0.4CoO 3, enhancement of sintering characteristics of the CGO and no reaction products were observed. From scanning electron microscopy observation, the sintered CGO samples with Fe 2O 3 showed the feature by solid-state sintering mechanism. For the CGO with CuO, the samples showed the trace of liquid-phase sintering. The samples of CGO with Co 3O 4 included large grains, which seem to relate to cobalt vapor from the cobalt oxide particles.
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