Hydrogenation and Dehydrogenation Behavior of LaNi_<5-x>Co_x (x=0, 0.25, 2) Alloys Studied by Pressure Differential Scanning Calorimetry

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The hydrogenation and dehydrogenation behavior of LaNi<SUB>5</SUB>, LaNi<SUB>4.75</SUB>Co<SUB>0.25</SUB> and LaNi<SUB>3</SUB>Co<SUB>2</SUB> was studied by the pressure differential scanning calorimetry (PDSC) at the hydrogen pressure range of 1 to 5 MPa in the temperature range from 323 to 473 K with the heating and cooling rates of 2 to 30 K min<SUP>−1</SUP>. In the heating run of the hydride of LaNi<SUB>5</SUB>, two endothermic peaks were observed. One was the peak for the transformation from the γ phase (full hydride LaNi<SUB>5</SUB>H<SUB>6</SUB>) to the β phase (hydride LaNi<SUB>5</SUB>H<SUB>3</SUB>). The other was the peak for the transformation from the β phase to the α phase (solid solution). In the cooling run, one exothermic peak for the transformation from the α phase to the γ phase was observed. These endothermic and exothermic peaks shifted to higher temperatures with the increase in hydrogen pressure. In the heating and cooling runs of the LaNi<SUB>4.75</SUB>Co<SUB>0.25</SUB>–H<SUB>2</SUB> system the PDSC curves similar to those of the LaNi<SUB>5</SUB>–H<SUB>2</SUB> system were observed. However, in the heating run of the hydride of LaNi<SUB>3</SUB>Co<SUB>2</SUB> only one endothermic peak was observed. Using Ozawa’s method, the activation energies for dehydrogenation of the hydrides were estimated. The activation energy for the γ-β transformation was higher than that for the β-α transformation. Substitution of cobalt for a part of nickel in LaNi<SUB>5</SUB> increased the activation energies for the phase transformations.

収録刊行物

  • Materials transactions

    Materials transactions 43(5), 1095-1099, 2002-05-01

    公益社団法人 日本金属学会

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各種コード

  • NII論文ID(NAID)
    10012323523
  • NII書誌ID(NCID)
    AA1151294X
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13459678
  • NDL 記事登録ID
    6180251
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z53-J286
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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