Abstract

By the method of joint crystallization of solutions of nitrate salts, the highly dispersed powders of the composition (CeO₂)_0.98(Sm₂O₃)_0.02, (CeO₂)_0.95(Sm₂O₃)_0.05, and (CeO₂)_0.90(Sm₂O₃)_0.10 are synthesized, and on their basis, nanoceramic materials with a crystalline cubic structure of fluorite type are obtained, with the grain size of the crystallites of ~68–81 nm (1300°С). Their mechanical and electrophysical properties are studied; it is found that they have an open porosity of 2–6% and predominantly ionic (t_i = 0.82–0.71 in the range of 300–700°C) type of electrical conductivity due to the formation of mobile oxygen vacancies during the heterovalent replacement of Се⁴⁺ with Sm³⁺, σ_700°C =1.3 × 10^–2 S/cm. The studies show the prospects of using the obtained ceramic materials as solid oxide electrolytes of intermediate-temperature fuel cells.

中文翻译：

---

固体氧化物燃料电池CeO 2 -Sm 2 O 3体系中陶瓷电解质纳米材料的液相合成及理化性质

摘要

通过硝酸盐溶液的联合结晶方法，组成（CeO ₂）_0.98（Sm ₂ O ₃）_0.02，（CeO ₂）_0.95（Sm ₂ O ₃）_0.05和（CeO ₂）的高度分散的粉末_0.90（Sm ₂ O ₃）_0.10合成，并在其基础上，获得具有萤石型晶体立方结构的纳米陶瓷材料，其晶粒尺寸为〜68–81 nm（1300°С）。研究了它们的机械和电物理性质；发现它们具有2–6％的开孔率，并且由于在异价置换过程中形成了可移动的氧空位，因此主要具有离子型（t _i = 0.82–0.71，在300–700°C范围内）电导率Sm ³⁺为Се4 ^+的σ ，σ700 _°C = 1.3×10 ^–2 S / cm。研究表明将获得的陶瓷材料用作中温燃料电池的固体氧化物电解质的前景。