氧离子导体Na0.525Bi0.475ZrO2.975的制备与性能
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延安大学物理与电子信息学院

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TM 911

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The study on the preparation and performance of oxide ion conductor Na0.525Bi0.475ZrO2.975
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College of Physics and Electronic Information, Yan’an University

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    摘要:

    氧离子导体电导率对于固体氧化物燃料电池的性能起着决定性的作用。本文采用传统固相反应法合成单一钙钛矿结构的Na0.525Bi0.475ZrO2.975氧离子导体,利用交流阻抗谱来研究Na0.525Bi0.475ZrO2.975材料的氧离子导电性能,氧离子电导率会随温度的升高而增大,电导率的对数与温度的倒数近似于呈现线性关系,在748K温度时,其氧离子电导率为1.2×10-6S/cm,进而根据Arrhenius关系计算得到氧离子的扩散激活能为0.92 eV。通过与结构类似的Na0.525Bi0.475TiO2.975材料性能的比较分析,较大的Zr4+半径和较强的Zr-O键直接导致在相同氧空位浓度Na0.525Bi0.475ZrO2.975材料中较高的氧离子扩散激活能和较低的氧离子电导率。

    Abstract:

    Oxide-ion conductivity plays an important role in the performances of solid oxide fuel cell. Solid state reaction method was used to synthesize the perovskite structure Na0.525Bi0.475ZrO2.975 sample. The AC impedance spectroscopy was employed to study the electrical properties of Na0.525Bi0.475ZrO2.975 sample. The grain conductivity increases with the raise of measuring temperature. The logarithm of the grain conductivity is inversely proportional to the measuring temperature. At 748K, the grain conductivity can reach 1.2×10-6 S/cm. According to the Arrhenius law, the activation energy of oxygen ion diffusion in the Na0.525Bi0.475ZrO2.975 sample can be calculated as 0.92 eV. Compared with the similar structure Na0.525Bi0.475TiO2.975, there is the larger Zr4+ ionic radius and the stronger Zr-O bonds, which causes the higher activation energy and lower oxide-ion conductivity in the Na0.525Bi0.475ZrO2.975 compound.

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王伟国,李杰,刘晓. 氧离子导体Na0.525Bi0.475ZrO2.975的制备与性能[J]. 科学技术与工程, 2019, 19(11): .
wangweiguo, and. The study on the preparation and performance of oxide ion conductor Na0.525Bi0.475ZrO2.975[J]. Science Technology and Engineering,2019,19(11).

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  • 收稿日期:2018-12-13
  • 最后修改日期:2019-01-22
  • 录用日期:2019-02-12
  • 在线发布日期: 2019-04-25
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