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本文用X射线分析和热学分析的方法研究了LaNi_5-LaCu_5赝二元系的相平衡关系。这一体系属连续固溶体体系。随Cu含量的增加,熔点降低,点阵常数α和c增加,贮氢量下降,氢化物的稳定性随之提高。论证了LaNi_(5-x)Cu_xH_y是LaNi_(5-x)Cu_x-H_2体系的一个独立化合物,LaNi_(5-x)Cu_x的吸氢机制是合金一部分一部分被氢化形成氢化物的过程,而不是氢均匀地溶解在合金中的连续过程,放氢机制是其逆过程。在LaNi_(5-x)Cu_x合金中,特别是垂直于主轴的基面,La与Ni(或Cu)的原子半径被分别压缩,但是形成氢化物时,这种压缩现象消失。
In this paper, the phase equilibrium of LaNi_5-LaCu_5 pseudo binary system has been studied by X-ray analysis and thermal analysis. This system is a continuous solid solution system. With the increase of Cu content, the melting point decreases, the lattice constants α and c increase, the hydrogen storage decreases, and the stability of hydride increases. It is demonstrated that LaNi_ (5-x) Cu_xH_y is an independent compound of LaNi_ (5-x) Cu_x-H_2 system and the hydrogen absorption mechanism of LaNi_ (5-x) Cu_x is a process in which part of the alloy is hydrogenated to form hydride instead of Hydrogen dissolved in the alloy in a continuous process, the mechanism of hydrogen is the reverse process. In LaNi_ (5-x) Cu_x alloys, the atomic radii of La and Ni (or Cu) are compressed separately, especially in the basal plane perpendicular to the major axis, but disappear when hydrides are formed.