【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50~150 nm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.更多还原

【Abstract】 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 1.0×10-1 Ω-1·cm-1 at the measuring temperatures of 600 and 800 ℃,respectively.更多还原