LaNi2．5M0．5(M=Ni，Fe，Mn，Si)贮氢合金氢致非晶研究

Hydrogen-induced Amorphization in LaNi_(2.5)M_(0.5) (M=Ni,Fe,Mn,Si) Alloys

采用XRD和电化学测试的方法研究了Fe、Mn、Si部分替代Ni对LaNi3型贮氢合金氢致非晶化的影响。结果表明:LaNi2.5M0.5(M=Ni,Fe,Mn,Si)贮氢合金的主相均为LaNi3相;在第一次充电后,合金均有一定程度的氢致非晶化现象;LaNi3和LaNi2.5Fe0.5合金的放电曲线没有放电平台,表明合金充电后为非晶态;LaNi2.5Mn0.5和LaNi2.5Si0.5合金的放电曲线有一个倾斜的平台,这表明少量的Mn和Si可以在一定程度上抑制LaNi3型贮氢合金的氢致非晶反应。

Effects ofFe, Mn and Si on the hydrogen-induced amorphization in LaNi3 were investigated by XRD and electrochemical method. All the LaNi2.sMo.5 （M = Ni, Fe, Mn and Si） alloys were prepared by melt-spun plus annealing method and their main phase is LaNi3. It is found that the hydrogen-induced amorphization appears in all the alloys for the first charging cycle. During the discharge process, no plateau is observed in LaNi3 and LaNi2.5Fe0.5 but a plateau in LaNi2.5Mn0.5 and LaNi2.5Si0.5, indicating that a small amount of Mn and S i suppresses the tendency of hydrogen-induced amorphization.