【摘要】 低温燃烧合成法是新兴的制备纳米粉体的工艺,在制备固体氧化物电解质方面有着很好的应用前景。对低温燃烧合成工艺中不同还原剂对粉体性能的影响进行了研究。分别用甘氨酸和尿素作还原剂制备Ce0.85Sm0.15O1.925粉体,以固相法粉体为参照,通过红外光谱、XRD,SEM等检测方法,从粉体的掺杂效果和烧结活性两方面进行比较。结果发现:用甘氨酸作还原剂制备的Ce0.85Sm0.15O1.925粉掺杂效果良好,晶格常数为0.5431 nm;晶粒细小,平均晶粒尺寸为5.8 nm;烧结活性良好,在1200℃即可达到较高致密度,烧结体晶界洁净,晶粒尺寸均匀适中。更多还原

【Abstract】 As a new technique preparing doped powder,low-temperature combustion synthesis( LCS) method has a widespread application prospect in preparation of solid oxide electrolyte materials. This paper trends to investigate the effect of reducing agent on the doping effect and sintering activity when preparing Ce0. 85Sm0. 15O1. 925 powders by low-temperature combustion synthesis process. The glycine and urea were used as a reducing agent. The powders prepared by low-temperature combustion synthesis process were compared with the powders prepared by solid phase reaction by FI-IR,XRD and SEM analysis methods. The results showed that the Ce0. 85Sm0. 15O1. 925 powder prepared by LCS with glycine as reducing agent had an appropriate lattice constant a = 0. 5431 nm and fine grains with an average grain size 5. 8 nm which meant the powder has good doping effect and sintering activity. Also the electrolyte prepared by the Ce0. 85Sm0. 15O1. 925 powder could be well densified at 1200 ℃ and had clean grain boundaries with uniform and fine grains.更多还原