High oxide ion conducting solid electrolytes of bismuth and niobium co-substituted La2Mo2O9

Xiao Liu, Huiqing Fan, Jing Shi, Guangzhi Dong, Qiang Li

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24 引用 (Scopus)

摘要

Bismuth and niobium co-substitutions on lanthanum molybdate with the nominal formula La2-xBixMo2-xNbxO9-δ (x = 0-0.24) (LBMN) are synthesized via solid state reaction. Their structures and properties are studied by powder X-ray diffraction (XRD), thermal analysis, electron diffraction, and impedance spectroscopy. XRD experiments and thermal analysis demonstrate the stabilization of the high temperature cubic phase when x ≥ 0.04. Studies of the polar area in electron diffraction confirm the inhomogeneous nature of the composition. A modified Debye relaxation approach is employed to learn the ion dynamics, and it shows non-monotonic functions in relaxation parameters τ0 and the activation energy Ea, which is in agreement with the volume variation of the basic [O1La3Mo] tetrahedral as a new structural description. As a result, the LBMN system exhibits good performance in electrical conductivities at high temperature, and shows a decrease of the average thermal expansion coefficients (TECs) along the dopant content.

源语言英语
页(从-至)17819-17827
页数9
期刊International Journal of Hydrogen Energy
39
31
DOI
出版状态已出版 - 22 10月 2014

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