The Effect of hydrogen treatment on the pseudo-binary Hfni 0:35 Al 1:65 Laves phase structure

Abstract

Structural changes of the pseudo-binary Hfni 0:35 Al 1:65 Laves phase at hydrogen treatment and heating were studied by X-ray diffraction and magnetic phase analysis. The X-ray measurements showed that the Hfni 0:35 Al 1:65 compound was amorphized by hydrogenation, and the transformation to an amorphous state took place without the formation of a crystalline hydride phase. At 600 K the sample decomposed into Ni and amorphous phases believed to be equilibrium phases. The existence of ferromagnetic-like behavior of the amorphous Hfni 0:35 Al1:65 phase was detected. The coercitivity was 12.8 kA/m indicating low magnetic hard properties. The magnetic phase analysis was in good agreement with the X-ray measurements. The existence of three ferromagnetic-like phases was shown and the formation of Ni was confirmed.