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The hydrogenation of a crystalline Ni-Fe (80 wt.% Ni, 20 wt.% Fe) powder   mixture leads to the formation of a mixture of Face Centered Cubic (FCC)-Ni   and FCC-Fe phase nanocrystals embedded in an amorphous matrix. The magnetic   susceptibility of the nanostructured powder is 2.1 times higher than that of   the as-produced crystalline mixture. Heating in the temperature range 420-590   K causes structural relaxation in the hydrogenated powder, resulting in an   increase of the magnetic susceptibility and a decrease of the electrical   resistivity. During the heating procedure, the reorientation of magnetic   domains in nickel and iron takes place in the temperature range 580-650 K and   790-850 K, respectively. In the pressed sample from the powder mixture, the   crystallization of the amorphous phase of nickel and its FCC lattice   crystalline grain growth occurs in the temperature range 620-873 K causing a   decrease in the magnetic susceptibility of the nickel FCC phase and a sudden   drop in the electrical resistivity. Prolonged heating of the mixed powders at   873K results in the formation of a Ni-Fe solid solution with higher magnetic   susceptibility than the starting mixture. [Projekat Ministarstva nauke   Republike Srbije, br. 172057

Amorphous-crystalline Ni-Fe powder mixture: Hydrogenation and annealing effects on microstructure and electrical and magnetic properties