Abstract
For a design of ideal structure in doped CeO2 solid electrolytes, micro-structures of M0.25Ce0.75O1.875 (M=Gd, Yb, Y) sintered bodies were characterized using Transmission Electron Microscopy. This micro-analysis indicates that micro-domain with ordered structure of oxygen vacancy is present in the sintered bodies. It is concluded that the micro-domain consists of a transition structure between fluorite and superstructure such as C-type rare earth structure. On the microanalysis data, we proposed our original idea of conduction mechanism in nano-hetero structured doped CeO2 solid electrolytes. In our idea, the space charge layer exists around micro-domains. This nano-structural feature is subtle, but it is concluded that the oxide ionic conductivity is conspicuously influenced by this subtle change in the grain.
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