Study of Crystal Structure and Protonic Conduction Properties of La₀.₉Ba₁.₁GaO₄-δ Prepared by Liquid Synthesis Method

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  • HAMAO Naoki
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
  • KITAMURA Naoto
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science Division of Ecosystem Research, Research Institute for Science and Technology, Tokyo University of Science
  • ISHIDA Naoya
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science Division of Ecosystem Research, Research Institute for Science and Technology, Tokyo University of Science
  • KAMIYAMA Takashi
    Institute of Materials Structure Science, High Energy Accelerator Research Organization
  • TORII Shuki
    Institute of Materials Structure Science, High Energy Accelerator Research Organization
  • YONEMURA Masao
    Institute of Materials Structure Science, High Energy Accelerator Research Organization
  • IDEMOTO Yasushi
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science Division of Ecosystem Research, Research Institute for Science and Technology, Tokyo University of Science

書誌事項

タイトル別名
  • Study of Crystal Structure and Protonic Conduction Properties of La<sub>0.9</sub>Ba<sub>1.1</sub>GaO<sub>4−δ</sub> Prepared by Liquid Synthesis Method
  • Study of Crystal Structure and Protonic Conduction Properties of La0.9Ba1.1GaO4^|^minus;^|^delta; Prepared by Liquid Synthesis Method

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抄録

In order to investigate an effect of the preparation process on protonic conductivity of La1−xBa1+xGaO4−δ, we attempt to prepare the samples with x = 0.1, La0.9Ba1.1GaO4−δ, by a liquid synthesis method as well as a conventional solid-phase method. Their electrical conductivities are measured from 300 to 900°C in various water vapor partial pressures, PH<sub>2O</sub>. From the result, it is found that the protonic conductivity is higher in the sample synthesized by the liquid synthesis method compared with that by the solid-phase method. In addition, it is also indicated that the PH<sub>2O</sub>-dependence of the electrical conductivity around 600°C is more significant in the sample prepared by the liquid synthesis method. This result implies that this method enhances proton dissolution in La0.9Ba1.1GaO4−δ at least around the temperature range. To investigate a crystal structure change by the synthesis method, we perform powder neutron diffraction measurements. The Rietveld and maximum entropy method (MEM) analyses demonstrate that nuclear density of the proton is clearly observed between neighboring O3 sites, and suggest that the liquid synthesis method makes a site occupancy of proton higher.

収録刊行物

  • Electrochemistry

    Electrochemistry 82 (7), 550-556, 2014

    公益社団法人　電気化学会

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