Hydrogen-induced and A-site substitution-dependent structural properties of AB2-type (Ho1−xAx)Co2–hydrogen system (A=Mm and Ti)

Influence of hydrogen absorption–desorption on structural properties of Dy1−xMmxCo2alloys

“…the transformation from a crystalline to an amorphous phase by hydrogen absorption [21][22][23][24][25][26]. The formation of amorphous hydrides and their decomposition into constituent hydrides greatly depends on the hydrogenation temperature [27], the hydrogen pressure [28] and the type of rare earth or transition metal present in the host RM 2 alloy [5,9,13,24,29,30].…”

“…However, there are a few investigations on the HIA and decomposition of the pseudobinary and ternary alloys, in which the occurrence of HIA mainly depends on the substitution of the third element in either of the sites of binary Laves phase RM 2 alloys [9,13,31,32]. For example, the tendency for the occurrence of HIA in HoCo 2 drastically decreases when substituting Zr or Ti at the Ho site [9,29]. The binary ErMn 2 does not exhibit any sign of amorphization but a small substitution of Co for Mn in ErMn 2 can make it possible to transform into an amorphous state [32].…”