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Nd-doped BaCeO  3  have been obtained from homogeneous coprecipitated oxalates when calcined at temperatures T≥1000 °C. Ball-milling of the calcined powders well disperses the agglomerates and consequently has a beneficial effect in the densification process. The calcination temperature has a major influence on the sintering process and powders calcined at 1100 °C possess good sinterabilities. The pressure applied to press the green pellets has no apparent influence on the sintered density at sintering temperatures ofT≥1400 °C. By controlling the processing variables it was possible to obtain near fully dense Nd-doped BaCeO  3  ceramics with homogeneous microstructure at a sintering temperature as low as 1300 °C. Electrical conductivities of the sintered samples were measured in dry and moist air and in hydrogen in the temperature range 500–800 °C using complex impedance techniques. Much higher proton conductivity was obtained in this work compared with previously reported values, in which the samples were prepared from traditional ceramic methods.

Preparation of Nd-doped BaCeO3 proton-conducting ceramics by homogeneous oxalate coprecipitation