由于LaNi_5具有比液态氢,甚至固态氢电大密度的贮氢能力,较低的平台压和较好的活化能力,被人们认为是目前最重要的贮氢合金之一.但是纯La价格昂贵,在实际生产中往往用混合稀土(99%为La,Ce,Pr,Nd)来代替La.然而实验发现,用混合稀土特别是Ce代替La后,氢化物的稳定性大大下降,合金的吸氢平台压剧增了几十个大气压,活化能力也大大下降.由于RENi_5(RE=La,Ce,Pr,Nd)的原子结构相同,RE原子半径相差极小,仅仅用 LaNi_5 is regarded as one of the most important hydrogen storage alloys at present due to its large hydrogen storage capacity, lower plateau pressure and better activation ability than that of liquid hydrogen and solid hydrogen, however, pure La is expensive, In practice, rare earths (99% La, Ce, Pr, Nd) are often used instead of La. However, it has been found experimentally that the stability of the hydride is greatly reduced by using rare earth elements, especially Ce, instead of La. As the atomic structure of RENi_5 (RE = La, Ce, Pr, Nd) is the same, the difference between the RE atomic radii is very small, only the