中性子回折による無機材料の結晶構造とイオン拡散経路の研究 Crystal Structure and Ion-Diffusion Pathway of Inorganic Materials through Neutron Diffraction

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著者

    • 八島 正知 YASHIMA Masatomo
    • 東京工業大学大学院理工学研究科物質科学専攻 Department of Chemistry and Materials Science, Graduate School of Science and Engineering, Tokyo Institute of Technology

抄録

The present brief review describes the application of neutron powder diffractometry and maximum-entropy method to the studies of crystal structure and diffusional pathways of mobile ions in ionic conducting ceramic materials. La<Sub>0.62</Sub>Li<Sub>0.16</Sub>TiO<Sub>3</Sub> and Li<Sub>0.6</Sub>FePO<Sub>4</Sub> exhibit two- and one-dimensional networks of Li cation diffusional pathways, respectively. In the fluorite-structured ionic conductors such as ceria solid solution Ce<Sub>0.93</Sub>Y<Sub>0.07</Sub>O<Sub>1.96</Sub>, bismuth oxide solid solution δ-Bi<Sub>1.4</Sub>Yb<Sub>0.6</Sub>O<Sub>3</Sub> and copper iodide CuI, a similar curved diffusion pathway along the ‹100› directions is observed. In the cubic <I>AB</I>O<Sub>3</Sub> perovskite-type ionic conductor, lanthanum gallate solid solution, the mobile ions diffuse along a curved line keeping the interatomic distance between the <I>B</I> cation and O<Sup>2-</Sup> anion. We have experimentally confirmed that the anisotropic thermal motions of the apex O2 atom and the interstitial O3 atoms are essential for the high oxygen permeability of the K<Sub>2</Sub>NiF<Sub>4</Sub>-type mixed conductor. Diffusion paths of proton are visualized along <I>c</I> axis in hexagonal hydroxyapatite.

The present brief review describes the application of neutron powder diffractometry and maximum-entropy method to the studies of crystal structure and diffusional pathways of mobile ions in ionic conducting ceramic materials. La<Sub>0.62</Sub>Li<Sub>0.16</Sub>TiO<Sub>3</Sub> and Li<Sub>0.6</Sub>FePO<Sub>4</Sub> exhibit two- and one-dimensional networks of Li cation diffusional pathways, respectively. In the fluorite-structured ionic conductors such as ceria solid solution Ce<Sub>0.93</Sub>Y<Sub>0.07</Sub>O<Sub>1.96</Sub>, bismuth oxide solid solution δ-Bi<Sub>1.4</Sub>Yb<Sub>0.6</Sub>O<Sub>3</Sub> and copper iodide CuI, a similar curved diffusion pathway along the ‹100› directions is observed. In the cubic <I>AB</I>O<Sub>3</Sub> perovskite-type ionic conductor, lanthanum gallate solid solution, the mobile ions diffuse along a curved line keeping the interatomic distance between the <I>B</I> cation and O<Sup>2-</Sup> anion. We have experimentally confirmed that the anisotropic thermal motions of the apex O2 atom and the interstitial O3 atoms are essential for the high oxygen permeability of the K<Sub>2</Sub>NiF<Sub>4</Sub>-type mixed conductor. Diffusion paths of proton are visualized along <I>c</I> axis in hexagonal hydroxyapatite.

収録刊行物

  • 表面科学 : hyomen kagaku = Journal of the Surface Science Society of Japan

    表面科学 : hyomen kagaku = Journal of the Surface Science Society of Japan 33(5), 284-289, 2012-05-10

    The Surface Science Society of Japan

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各種コード

  • NII論文ID(NAID)
    10030756310
  • NII書誌ID(NCID)
    AN00334149
  • 本文言語コード
    JPN
  • 資料種別
    REV
  • ISSN
    03885321
  • NDL 記事登録ID
    023780672
  • NDL 請求記号
    Z15-379
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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