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In conditions of growing loads and temperatures on engineering products, the problem of choosing efficient materials is relevant, especially in the realities of import substitution. One of such tasks for modern materials science is the production of high-temperature products of special engineering, including complex shapes. Metal and ceramic materials have a number of unique properties, which, on the one hand, determine the prospects for their use in the construction of special engineering products, and on the other hand, cause a number of technological problems, without which the operation of such products is extremely difficult. An analysis of advanced materials used for products of special high-temperature engineering, including the production of various components of gas turbine engines, is presented, as well as the results of research on the development of materials with improved characteristics.

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Finely dispersed (CeO2)0.95(Sm2O3)0.05, (CeO2)0.90(Sm2O3)0.10 and (CeO2)0.80(Sm2O3)0.20 mesoporous powders with a specific pore volume of 0.080–0.092 cm3/g and a specific surface of 50–83 m2/g are synthesized by the co-precipitation of cerium and samarium hydroxides from the corresponding nitrate solutions. The prepared powders are used to obtain ceramic nanomaterials with a fluorite-like cubic crystal lattice with a coherent scattering region (CSR) of about 65–69 nm (1300 °C). The study of physicochemical and electrophysical properties of the prepared ceramics revealed the obtained materials featuring an open porosity of 2–6% and a predominantly ionic type of electric conductivity (ion transport numbers ti = 0.85–0.73 in the temperature range 300–700 °C). The conductivity in solid solutions proceeds via a vacancy mechanism with σ700 °C= 3.3·10−2 S/cm. The synthesized ceramic materials are shown to be promising as solid oxide electrolytes in medium temperature fuel cells.