Abstract
We investigated the magnetic properties of meltspun Nd-Fe-C and Nd-Fe-C-B systems. The coercivity and (BH) max of Fe100-x(Nd2/3C1/3)x ternary alloys (x=17.5, 20, 22.5, 25) heat-treated at 800°C increased with a decrease in the Fe content. The (BH) max increased with the addition of boron to Fe77.5 Nd15 (C1-zBz)7.5 alloys. The Nd2Fe14C phase was clearly observed in the specimens, and an unknown ferromagnetic phase also appeared. The relative intensities and positions of the peaks of Mossbauer spectra led us to conclude that C atoms occupy the same sites as B atoms in the Nd2Fe14B phase and have a similar effect. The average magnetic hyperfine field of Nd2Fe14C is around 93% of that of Nd2Fe14B.
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