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La(或混合稀土Mm)对TiFe贮氢性能的影响

梁敬魁 饶光辉

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La(或混合稀土Mm)对TiFe贮氢性能的影响

梁敬魁, 饶光辉

EFFECT OF La (OR MISCHMETAL Mm) ON THE HYDROGEN STORAGE CHARACTERISTICS OF TiFe

LIANG JING-KUI, RAO GUANG-HUI
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  • 本文用排水法测量了TiFe+La及TiFe+Mm合金的贮氢量及坪台曲线。研究La及Mm对TiFe合金活化性能的影响。实验结果表明,当TiFe合金中的La或Mm含量大于4wt%时,就可以使合金的活化性能大为改善,使之在室温附近活化。La或Mm并没有进入TiFe晶格,它以第二相出现在合金中。La或Mm主要起纯化TiFe合金的作用。吸氢机制仍取决于TiFe金属间化合物。此外,我们还根据Miedema公式计算了TiFeLayH1.0的形成焓,并与实验值作了比较。
    The hydrogen storage capacities and pressure-composition isotherms of TiFe + La and TiFe + Mm alloys were measured by exhausting water method. The effect of La and Mm on the activation characteristics of the alloys was studied. It was shown that the activation characteristics of the alloys could be improved greatly and the alloys were activated near the room temperature when the quantities of La or Mm in the alloys were greater than 4 wt% under our experimental conditions. However, La or Mm did not enter the crystal lattice of TiFe. They presented in the alloys in the form of a second phase to purify the alloys. The hydrogen storage mechanism mainly depends upon the intermetallic compound TiFe. The formation enthalpies of the hypothetical hydrides TiFeLayH1.0, were also calculated after Miedema's formulae and compared with the experimental results.
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  • 收稿日期:  1986-02-14
  • 刊出日期:  2005-03-18

La(或混合稀土Mm)对TiFe贮氢性能的影响

  • 1. 中国科学院物理研究所

摘要: 本文用排水法测量了TiFe+La及TiFe+Mm合金的贮氢量及坪台曲线。研究La及Mm对TiFe合金活化性能的影响。实验结果表明,当TiFe合金中的La或Mm含量大于4wt%时,就可以使合金的活化性能大为改善,使之在室温附近活化。La或Mm并没有进入TiFe晶格,它以第二相出现在合金中。La或Mm主要起纯化TiFe合金的作用。吸氢机制仍取决于TiFe金属间化合物。此外,我们还根据Miedema公式计算了TiFeLayH1.0的形成焓,并与实验值作了比较。

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