A series of oxide ion conductors Ce6−xGdxMoO15− (0.0≤x≤1.8) have been prepared by the sol–gel method. Their properties were characterized by differential thermal analysis/thermogravimetry (DTA/TG), X-ray diffraction (XRD), Raman, IR, X-ray photoelectron spectroscopy (XPS), and AC impedance spectroscopy. The XRD patterns showed that the materials were single phase with a cubic fluorite structure. The conductivity of Ce6−xGdxMoO15− increases as x increases and reaches the maximum at x=0.15. The conductivity of Ce4.5Gd1.5MoO15− is t=3.6 × 10−3 S/cm at 700°C, which is higher than that of Ce4.5/6Gd1.5/6O2− (t=2.6 × 10−3 S/cm), and the corresponding activation energy of Ce4.5Gd1.5MoO15− (0.92 eV) is lower than that of Ce4.5/6Gd1.5/6O2− (1.18 eV).
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Document Type: Research Article
Bioengineering College, Changchun Technical School, Changchun 130012, Jilin, China
Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China
Publication date: May 1, 2009