【摘要】 研究了用常规共沉淀法掺杂Al₂O₃对YSZ固体电解质的烧结及电性能的影响.结果表明:适量的Al₂O₃能提高YSZ材料的烧结性能,促使其致密化,但过量的Al₂O₃对材料的致密化不利;同时,材料的晶界电导随Al₂O₃含量的增大表现出先增大后减小的变化趋势,这与Al₂O₃对YSZ晶界两方面的不同影响有关,Al₂O₃偏析于晶界一方面能清除晶界上对氧离子电导不利的SiO₂,但另一方面也会降低晶界空间电荷层中的自由氧离子空穴的浓度.更多还原

【Abstract】 The effects of the alumina doped through the normal co-precipitation on the sinteringand conductivity of Yttriastabilized zirconia were studied. The study shows that proper additionof alumina can accelerate the process of siotering and improve the sintering density of zirconia, butit does harm to the silltering density of YSZ if the content of alumina is too high; the grain-boundaryconductivity increases at first and then decreases with increasing content of added alumina. Thereason why grain-boundary conductivity changes with the content of alumina is that aluminasegregated to the grain boundary has two opposite effects on the grain boundary: at one side itcan scavenge silicon dioxide which blocks ionic transport at the grain boundary, at the other sideit decreases the free oxygen ion vacancy concentration.更多还原