【摘要】 为提高YSZ固体电解质材料的电性能,采用甘氨酸-硝酸盐液相燃烧法制备了Sc³⁺(Dy³⁺)和Yb³⁺复合掺杂的YSZ材料.复合掺杂剂的加入使材料保持稳定的立方结构,且增大了样品晶格常数和氧空位迁移半径R值.试样电导率得到提高,1000℃电导率达0.15S/cm.显微结构分析表明,复合添加剂促进了ZrO₂晶粒的生长,晶粒间存在明显的第二相组分,限制了电导率的进一步提高.继续添加Al³⁺、Ca²⁺明显改善了晶界状况,晶界处较为洁净,但试样高温电导率略有降低.更多还原

【Abstract】 In order to increase the conductivity of YSZ,doped-YSZ electrolytes with Sc³⁺(Dy³⁺)and Yb³⁺ were prepared by combustion synthesis from glycine-nitrate solution.The introduce of complex additives made the cubic structure of the sample stable,and the conductivity was enhanced due to the increase of the crystal lat- tice and the oxygen transfer passage radii,reaching 0.15 S/cm^-1at 1000℃.SEM photographs showed the complex additives promoted growth of ZrO₂.There were second phases along the grain boundaries,which re- stricted the further increase of conductivity.The addition of Al³⁺or Ca²⁺improved crystal boundary,but low- ered the high-temperature conductivity.更多还原