Study of the effect of methods for liquid-phase synthesis of nanopowders on the structure and physicochemical properties of ceramics in the CeO2-Y2O3 system

Two alternative chemical synthesis methods-cryotechnological coprecipitation of hydroxides and cocrystallization of salts-were used for preparing (CeO2)(1-x) (Y2O3) (x) nanopowders (x = 0.10, 0.15, 0.20) with a mean coherent scattering domain size of similar to 7-11 nm and S (sp) = 2.1-97.5 m(2)/g. From these nanopowders, ceramic nanomaterials with mean coherent scattering domain sizes of similar to 61-85 nm were synthesized. It was studied how the phase composition, microstructure, and electrical transport properties of the produced samples depend on the Y2O3 content of a CeO2-based solid solution and on the synthesis method. It was shown that, in the series (CeO2)(1-x) (Y2O3) (x) (x = 0.10, 0.15, 0.20), the solid solution (CeO2)(0.90)(Y2O3)(0.10) has the highest ionic conductivity with the ion transport number t (i) = 0.73 (600A degrees C). In its physicochemical characteristics, this ceramic can be used as a solid electrolyte of intermediate-temperature fuel cells.