Effect of MoO₃ concentration on sintering and electrical properties of SiO₂-containing neodymium-doped ceria electrolytes

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• 作者：Guichun Zhao^a ; Defeng Zhou^a ; ^{defengzhou65@126.com"" rel=""nofollow} ; Jianxin Zhu^c ; Mei Yang^a ; Jian Meng^b
• 关键词：Neodymium-doped ceria ; Molybdenum oxide ; Sol– ; gel preparation ; Grain boundaries ; SiO₂
• 刊名：Solid State Sciences
• 出版年：2011
• 出版时间：May 2011
• 年：2011
• 卷：13
• 期：5
• 页码：1072-1075
• 全文大小：641 K

文摘

The effects of MoO₃ concentration on the sintering and electrical properties of Ce_0.8Nd_0.2O_1.9 + 500 ppm SiO₂ (NDCSi) and (Ce_0.8Nd_0.2O_1.9)_1 − x(MoO₃)_x + 500 ppm SiO₂ ( x = 0.01, 0.02, 0.03, 0.04, 0.05, NDCSi + 1MoO₃, NDCSi + 2MoO₃, NDCSi + 3MoO₃, NDCSi + 4MoO₃, NDCSi + 5MoO₃) prepared through a modified sol–gel method were systematically investigated. The structures and ionic conductivities were characterized by XRD, FE-SEM and EIS. The results indicated a sharp increase in densification and conductivity for the system of NDCSi containing small amount of MoO₃. It shows that NDCSi + 3MoO₃ exhibited much higher relative density (RD = 96 % ), higher conductivity (σ_t = 1.25 × 10⁻² S cm⁻¹ at 600 °C) and lower activation energy (E_a = 0.81 eV) compared with NDCSi and the other MoO₃ doped-NDCSi samples. Furthermore, MoO₃ could be used as an effective sintering aid and a grain boundary scavenger for NDCSi system. And we obtained the optimal amount of the MoO₃ is 3 mol % .