Ml_(1-x)Ca_xNi_5合金的氢化物稳定性研究

Investigation on the Stability of the Hydrides of Ml 1-x Ca x Ni 5 Intermetallic Compounds

系统研究了Ｍｌ１－ｘＣａｘＮｉ５系贮氢合金的氢化物稳定性（以合金的氢化物的放氢平台压力来表征）及其影响因素。提出了Ｃａ部分取代Ｍｌ后对Ｍｌ１－ｘＣａｘＮｉ５系贮氢合金的氢化物的稳定性影响的两个因素，即几何因素和电子因素，并由此导出了合金的氢化物的放氢平台压力与合金晶胞体积的关系式：ｌｎＰ＝－１．１４８５８Ｖ２＋１９５．５６２４Ｖ－８３２２．０５６２理论曲线与实验结果吻合。

The stability of the hydrides of Ml 1- x Ca x Ni 5(where Ml is La-rich mischmetal) family hydrogen storage alloys has been systematically investigated. It is found that the effect of partial substitution of Ca for Ml on the stability of the hydrides of Ml 1- x Ca x Ni 5 includes two aspects: geometrical factor and electric factor. The correlation of the desorption pressure of the hydrides with the cell volume of a hydrogen storage alloy before dydrogenation can be represented as:  ln P=-1 148 58V 2+195 562 4V-8 322 0562