Formation of C-type rare earth structures in the Ce1-xNd[x]O2-δ system: a factor in the decrease in oxide-ion conductivity

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  • HAGIWARA Takeshi
    Research Institute for Engineering, Kanagawa University
  • KYO Zuiho
    Research Institute for Engineering, Kanagawa University
  • MANABE Akitaka
    Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University
  • YAMAMURA Hiroshi
    Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University
  • NOMURA Katsuhiro
    Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology (AIST)

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タイトル別名
  • Formation of C-type rare earth structures in the Ce1-xNdxO2-.DELTA. system: a factor in the decrease in oxide-ion conductivity
  • Formation of C type rare earth structures in the Ce1 xNd x O2 d system a factor in the decrease in oxide ion conductivity

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It was found that oxide-ion conductivity of Nd-doped CeO2 (Ce1-xNdxO2-x/2) increased with an increase in Nd content x up to x = 0.2, showing a maximum value at x = 0.2, and then decreased with x. In order to clarify the origin of the decrease in the conductivity of the heavily Nd-doped CeO2, Rietveld analyses of the X-ray diffraction and neutron diffraction data were carried out, assuming two phases with oxygen deficient fluorite-type and rare-earth C-type structures (0.45 ≤ x ≤ 0.7). The oxide-ion conductivity of the heavily Nd-doped CeO2 is discussed in relation to the formation of the rare-earth C-type structure, which derives from the oxygen ordering of the defect fluorite-type structure.

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