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Electrical conductivity of Y2O3-doped CeO2 based composite ceramics by spark plasma sintering: The effects of a second phase of CeAlO3
Solid State Ionics ( IF 3.0 ) Pub Date : 2021-05-11 , DOI: 10.1016/j.ssi.2021.115653
X.Y. Ping , B. Meng , W.K. Liang , Q. Zheng , C. Li

The Ce0.85Y0.15O2-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.



中文翻译:

放电等离子体烧结Y 2 O 3掺杂的CeO 2基复合陶瓷的电导率:第二相CeAlO 3的影响

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 (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 33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%。

更新日期:2021-05-11
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