Magnetic properties of hydrogen-amorphized RCo2Hx (R=Gd, Tb, Dy, Ho, Er, Tm and Y) alloys

Influence of doping elements (Y, Fe, V) on magnetic properties of RM2(R = Gd, Er; M = Fe, Co, Ni) Laves phases and their hydrides

“…However substitutions of the above mentioned Laves phases with light 3d metals as Ti [16] or V are rather rare. As the hydrogen absorption capability can be enhanced in these systems by V substitution [12] without changing the crystal structure or that hydrogen induced amorphisation occurs at larger hydrogen content [17], it is the aim of this paper to present the relevant changes of the magnetic properties upon hydrogen absorption of the title compounds.…”

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

“…the transformation from a crystalline to an amorphous phase by hydrogen absorption [1][2][3][4][5][6][7]. HIA has been observed in a large number of intermetallic compounds.…”

“…Among these intermetallics, HIA in the Laves phase RM 2 (R = a rare earth metal, M = Fe, Co, Ni and Mn) is particularly interesting and a lot of investigations have been employed to confirm HIA [6][7][8][9][10][11][12]. The formation of amorphous hydrides and decomposition into constituent hydrides greatly depend on the hydrogenation temperature [4,6,9,13], the hydrogen pressure [14][15][16][17] and the type of rare earth or transition metal present in the RM 2 alloy [1][2][3][4]8,10,11,18,19]. Further, there are a few of the investigations on the HIA and decomposition of the pseudobinary and ternary alloys, in which the HIA mainly depends on the substitution of the third element in either of the sites of binary Laves phase RM 2 alloys [20][21][22][23][24][25].…”

Kinetics of hydrogen absorption in the solid solution region for Laves phase Ho1−xMmxCo2 (x=0, 0.2 and 0.4) alloys

“…During the hydriding reaction, the hydrogen atoms first occupy some interstices in the C15 structure forming the solid solution (a phase). With the hydriding absorption proceeding, the hydrogen-induced amorphization occurs during the formation of hydride phase (b phase) [8,9]. In the lattice expansion and the embrittlement induced by amorphization, the bulk sample breaks into powders.…”