Abstract
Nanopowders of the composition (СeO2)1 – x(Sm2O3)x (x = 0.02; 0.05; 0.10; 0.20) were synthesized by two methods of chemical liquid-phase synthesis: co-precipitation of hydroxides with freezing and co-crystallization of salts with an average OCD size of ~ 8 – 11 nm, Sud = 40 – 83 m2/g. Based on them, ceramic nanomaterials with a cubic crystal structure of the fluorite type, with an OCR of ~ 65 – 81 nm (1300 °C), were obtained. The dependence of the phase composition, microstructure, and electric transport properties of the obtained samples on the content of Sm2O3 in a solid solution based on CeO2 and the synthesis method is revealed. It is shown that in the series (СeO2)1 – x(Sm2O3)x (x = 0.02; 0.05; 0.10; 0.20) a solid solution of the composition (CeO2)0.80(Sm2O3)0.20 has the highest ionic conductivity σ700 ºC = 2.7·10–2 Cm/cm. The resulting ceramic can be used as a solid electrolyte for medium-temperature fuel cells due to its physical and chemical characteristics.
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