γ-Mg_<17>Al_<12>相の水素吸蔵特性 Hydrogen absorption properties of the γ-Mg_<17>Al_<12> phase

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著者

    • NOBUKI Tohru
    • School of High Technology for Human Welfare, Tokai University
    • KATO Shunsuke
    • Department of Energy Science and Engineering, School of Engineering, Tokai University
    • KUJI Toshiro
    • Course in Materials Science and Chemistry Unified Graduate School, Tokai University

抄録

In the present work, the Mg-Al system was studied towards hydrogen absorption properties.<br>Several Mg<sub>x</sub>Al<sub>100-x</sub> compounds from X=47.5 to 70 by incremental step of 2.5 were prepared by ball-milling with post-annealing. Different experimental measurements were performed and are in mutual agreement with properties of existing phases. They show that deviation from the ideal composition of Mg<sub>17</sub>Al<sub>12</sub> (X=58.62) leads to a decrease of the homogeneity. The single γ-phase range is extended at room temperature for initial 55≤X≤62.5 atomic % of Mg.<br>The hydrogenation properties have been investigated for two compounds at the nominal composition X=50 and X=58.6. The hydrogen absorption is presented at 350°C and shows a maximum hydrogen capacity of 3.5 and 3.7 wt% respectively. For these two compounds, the pressure-composition isotherm (PCT) curves show two absorption plateaux, with equilibriums around 10 bars which are higher than that of pure MgH<sub>2</sub>. The shape discontinuity corresponds to a transformation into a 2-step process as described in this work. After final desorption, the initial compounds are recovered, indicates that the reactions are reversible.

In the present work, the Mg-Al system was studied towards hydrogen absorption properties.<br>Several Mg<sub>x</sub>Al<sub>100-x</sub> compounds from X=47.5 to 70 by incremental step of 2.5 were prepared by ball-milling with post-annealing. Different experimental measurements were performed and are in mutual agreement with properties of existing phases. They show that deviation from the ideal composition of Mg<sub>17</sub>Al<sub>12</sub> (X=58.62) leads to a decrease of the homogeneity. The single γ-phase range is extended at room temperature for initial 55≤X≤62.5 atomic % of Mg.<br>The hydrogenation properties have been investigated for two compounds at the nominal composition X=50 and X=58.6. The hydrogen absorption is presented at 350°C and shows a maximum hydrogen capacity of 3.5 and 3.7 wt% respectively. For these two compounds, the pressure-composition isotherm (PCT) curves show two absorption plateaux, with equilibriums around 10 bars which are higher than that of pure MgH<sub>2</sub>. The shape discontinuity corresponds to a transformation into a 2-step process as described in this work. After final desorption, the initial compounds are recovered, indicates that the reactions are reversible.

収録刊行物

  • Journal of advanced science  

    Journal of advanced science 19(3), 88-96, 2008-02-29 

    Society of Advanced Science

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各種コード

  • NII論文ID(NAID)
    10021874996
  • NII書誌ID(NCID)
    AA11948435
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    09155651
  • データ提供元
    CJP書誌  J-STAGE 
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