Hydrogen absorbing alloys having MgZn.sub.2 -type laves phase structure

摘要

Alloys having the composition Zr(Mn.sub.1-x Co.sub.x).sub.y Al. sub.z A. sub.w are formed by adding rare-earth metals such as La, Ce, and Mm and the like or V to a Zr-Mn-Co-Al quaternary alloy, where A is at least one of rare-earth metals such as La, Ce, Mm and the like or V, and the amount x of Co substituent is the range 0 x 0.5; stoichiometric ratio y for (Mn+Co)/Zr, in 1.7 y 2.3; the amount z of Al added, in 0 z 0.15; and the amount w of A added, in 0 w 0.4. The alloys thus formed turn out to be hydrogen absorbing alloys having small absorption-disorption heat difference and long lives, yet maintaining the properties of the quaternary alloy.