【摘要】 采用X射线衍射法研究了LaNi5 .1 5 ,La(NiSn) 5 .1 4 ,La(NiSnCo) 5 .1 2 ,La(NiSnMn) 5 .1 2 ,La(NiSnCoMnAl) 5 .1 0 5种AB5 型非化学计量贮氢合金的结构。发现主物相中并未产生第二物相 ,AB5 型贮氢合金中B原子数发生正偏移时 ,晶胞体积减小 ,当B侧含有取代元素时 ,这种变化更加明显。对于非化学计量贮氢合金而言 ,少量Sn取代Ni后 ,晶胞体积大大提高。Mn ,Co和Al的加入也会影响晶胞常数。Sn ,Co ,Mn ,Al均会降低贮氢合金放氢平台压力。更多还原

【Abstract】 Five non stoichiometric alloys, i.e., LaNi 5.15 , La(NiSn) 5.14 , La(NiSnCo) 5.12 , La(NiSnMn) 5.12 , and La(NiSnCoMnAl) 5.10 were studied. The second minor phase is not observed in the major phase through the X ray diffraction analysis. By measurements of the crystal lattice constant, it is found that the volume of crystal cell decreases with the increases of the quantity of atom B in AB 5. It is more substantial when B is partly substituted by other elements. For non stoichiometric alloys, the crystal cell volume greatly increase when Ni is substituted by Sn. The lattice constant is also effected by the addition of Mn, Co, and Al. By means of electrochemical measurements, the plateau of hydrogen absorption/desorption was measured with the results that Sn, Co, Mn and Al decrease the plateau.更多还原