中文摘要：

采用以尿素为燃料的燃烧合成法制备Ce0．8Sm0．2O1．9（SDC）氧离子导体材料，对燃烧合成粉体的物相和显微形态进行了表征，并研究了燃烧法合成SDC的烧结性能以及烧结体的导电性能．研究结果表明，采用尿素燃烧法合成SDC具有简便高效和合成粉体烧结活性高的优点．经过燃烧过程后即可得到立方萤石结构的纯相SDC粉体，合成粉体的分散性良好，为50—150nm的球形颗粒，具有高的烧结活性，在1250℃的烧结温度下，陶瓷样品的相对密度可达到95．1％．在600和800℃的测试温度下，烧结温度为1250℃的陶瓷样品的电导率分别达到5．4×10^-2和1．0×10^-1Ω^-1·cm^-1．

英文摘要：

Samaria-doped ceria（ Sm0.2Ce0. 8O1.9, SDC） is a promising candidate material for electrolyte of intermediate temperature（600--800 ℃） solid oxide fuel cells（IT-SOFCs）. SDC powders were synthesized by a combustion method with urea as a fuel. The phase purity and morphology of the resulting powders were characterized by XRD, TG-DSC, FESEM and BET specific surface area measurement. Moreover, the sinterability and electrical conductivity of the SDC were examined. The results demonstrate that the urea-combustion process is a simple and efficient route to produce high reactive SDC powder. It was found that the SDC powder with a pure cubic fluorite phase could be produced via a short-time combustion process. The SDC powder is composed of uniform and dispersed sphere-like particles in the range of 50-150 nm. This desired morphology effectively enhanced the sinterability of the powder. A gas-tight relative density of 95.1% was obtained in the SDC ceramic sintered at a relative low temperature of 1250 ℃. Furthermore, the ceramic sintered at the temperature presented superior electrical conductivity, reaching 5.4 × 10^-2 and 1.0 × 10^-1Ω^-1·cm^-1 era-1 at the measuring temperatures of 600 and 800℃, respectively.