LaNi_（5－x）Al_x贮氢合金的研究

Development of hydrogen storage alloys LaNi_(5-x)Al_x

用Ａｌ置换ＬａＮｉ５贮氢合金中部分Ｎｉ，得到一系列ＬａＮｉ（５－ｘ）Ａｌｘ（ｘ＝０．１，０．３，０．５）贮氢合金．通过对合金的热力学性能的测试可知：随着Ａｌ的加入及其含量的增加，贮氢合金的平台氢压降低，吸氢量有所减少，而吸氢速度有所增加．通过对合金及吸氢后氢化物品体结构的Ｘ射线衍射分析，发现Ａｌ的加入并未使晶体结构类型发生变化，只是晶格常数略有增加；同时还证明了ＬａＮｉ（５－ｘ）Ａｌｘ合金吸氢后其晶体结构也未发生变化，但晶格常数增加较大．

A series of hydrogen storage alloys LaNi5-xAlx(x= 0. 1, 0. 3, 0. 5) are obtainedby means of substitution of Al for a portion of Ni in the hydrogen storage alloy LaNi5.Itmay be found by measuring thermodynamic characteristics of the alloy that the drop of hydrogen equilibrium pressure, the decrease of hydrogen absorptivity, and the increase of hydrogen absorption speed will take place with Al being added and increase its amount. Bymeans of X-ray diffraction analysis of crystal lattice of the alloy and its hydride after the hydrogen being absorbed, it is found that the pattern of crystal lattice does not change with theaddition of the Al, only the lattice constant being slightly increased. It is also proved thatabsorption of the hydrogen does not change the lattice pattern in the allay LaNi5-x.Alx, butgreatly increases its lattice constant.