Nanogranular FexNi23-xB6 phase formation during devitrification of nickel-rich Ni64Fe16Zr7B12Au1 amorphous alloy

Idzikowski, B.; Szajek, A.; Greneche, J.-M.; Kovač, J.
August 2004
Applied Physics Letters;8/23/2004, Vol. 85 Issue 8, p1392
Academic Journal
Nickel-rich amorphous precursors with chemical composition of Ni64Fe16Zr7B12Au1 were produced by melt-spinning technique and then heat treated at temperatures ranging from 435 to 600 °C for 1 h to form a nanostructure. Properties of the amorphous and the nanocrystalline samples were investigated by the differential scanning calorimetry, the x-ray diffraction (XRD), the vibrating sample magnetometry, and Mössbauer techniques. The annealing favors the emergence of cubic FexNi23-xB6 crystalline grains (10–25 nm in diameter). Magnetic measurements made at 4.2–1100 K reveal rather high value of saturation magnetization (nearly 60 and 40 Am2/kg at 4.2 K and room temperature, respectively) in amorphous as well as in nanocrystalline states. These facts are consistent with 300 K 57Fe Mössbauer effect results which are well supported by the calculations of Ni and Fe magnetic moments in Ni23B6 and Fe23B6 phases, using the spin polarized tight binding linear muffin-tin orbital method. However, anomalous high magnetic moments of Fe atoms were found in some inequivalent positions in the crystal structure.


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