Abstract
Ce0.9Gd0.1O1.95 (CGO10) and in situ cobalt oxide‐doped CGO10 were prepared by pilot‐scale flame spray synthesis, yielding powders with an average particle size of 40 nm. Cobalt oxide was shown to be a very effective sintering aid for CGO10 and lowered the maximum sintering temperature from 1450° to about 1200°C. Sintering studies revealed that in situ cobalt oxide‐doped CGO10 exhibited a temperature of maximum shrinkage rate of 880°C for a dopant concentration of 1 mol% CoO1−x, whereas for conventionally cobalt oxide‐doped CGO10, this temperature was 914°C. This decrease is believed to be a result of a more homogeneous dopant distribution of the in situ cobalt oxide‐doped CGO nanopowders as compared with the powders in which the doping was introduced as nitrates.
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