Influence of Hydrogen on the Magnetic Properties of Hyperstoichiometric ZrMn2T0.8 (T = Fe, Co, Ni and Cu)

摘要

Magnetic properties have been investigated for the hyper-stoichiometric ZrMn2T(0.8) (T = Fe,Co,Ni and Cu) systems and their hydrides. Hydrogenation is accompanied by a large expansion in unit cell volume, ranging from 22 to 26% with no charge in crystal structure. Hydrogenation enhances magnetism in all cases. The system exhibits susceptibility behavior which can be fit to an expression of the form X=XO + C/-Theta. XO is appreciable for all materials studied except ZrMn2Cu(0.8), for which XO is negligible. The unusual history-dependent magnetic behavior of the hydrides studied below 80 K very likely is a consequence of their spin-glass-like behavior. A comparison of the present results with those of their counterpart ZrCrFeT0.8 is included. Keywords: Zirconium alloys, Manganese, Iron, Cobalt, Nickel, Copper. Reprints. (aw)