Abstract
An fcc-structured Fe55Nb45 alloy with a large lattice constant of a≈0.408nm was synthesized by 200keV xenon ion irradiation at a dose of 3×1015Xe+∕cm2. The Fe atom in Fe55Nb45 alloy presents a distinct magnetic moment as high as 2.41μB, confirming a high-spin ferromagnetic state of fcc Fe predicted by ab initio calculation. Further irradiation, i.e., at a dose of 5×1015Xe+∕cm2, induced phase separation, resulting in fractal growth consisting of Fe72Nb28 nanoclusters embedded in Fe35Nb65 matrix. The formation mechanism of alloy phases as well as fractal pattern was discussed in terms of the atomic collision theory.
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