The Ce_0.85Y_0.15O_2-δ (YDC)-xmol% aluminum containing compound (x = 0, 10, 20 and 40) composite powders were prepared through mixing YDC with 0, 10, 20 and 40 mol% Al(NO₃)₃ (named as A0, A10, A20, A40), and then densified by spark plasma sintering at 1300 °C for 5 min. The main phase of YDC exists in all samples, while a second phase of CeAlO₃ forms for x ≥ 10 in the composite ceramics. The diffraction peak intensity of CeAlO₃ gradually augments with the increase of Al(NO₃)₃ addition amount. The average grain size of the composite ceramics reduces from 1.7 μm to 0.34 μm with the rise in Al(NO₃)₃ addition amount from 0 to 40%. The grain boundary (GB) electrical conductivity of A10 and A20 is lowered by 96% and 89% compared with that of YDC at 350 °C because the CeAlO₃ phase exists in the form of flakes and fine grains and hinders the oxygen ion conduction across the GB of samples. When CeAlO₃ grains grow up and uniformly distribute in the A40, the GB conductivity of A40 increases by 405% relative to that of pure YDC at 350 °C.

通过将YDC与0、10、20和40 mol％的Al（NO _3）混合制备Ce _0.85 Y _0.15 O2 _-δ（YDC）-xmol％的含铝化合物（x = 0、10、20和40）复合粉末）₃（命名为A0，A10，A20，A40），然后通过火花等离子体烧结在1300致密化℃下进行5分钟。YDC的主相存在于所有样品中，而当x≥10时，在复合陶瓷中形成CeAlO ₃的第二相。随着Al（NO ₃）₃添加量的增加，CeAlO ₃的衍射峰强度逐渐增大。随着Al（NO _3）的增加，复合陶瓷的平均晶粒尺寸从1.7μm减小至0.34μm。）₃添加量从0到40％。在350°C时，A10和A20的晶界电导率与YDC相比降低了96％和89％，因为CeAlO ₃相以薄片和细颗粒的形式存在，并且阻碍了氧离子的传导GB的样本。当CeAlO ₃晶粒长大并均匀分布在A40中时，相对于在350°C的纯YDC，A40的GB电导率增加了405％。