Abstract
Abstract We report the magnetic hardening of CeFe 12− x Mo x by melt spinning at surface wheel speeds between 10 m/s and 30 m/s. The synthesis range of CeFe 12− x Mo x has been extended to CeFe 11 Mo, which uses the least amount of Mo substitution to stabilize the ThMn 12 -type structure. X-ray diffraction indicates that as-spun samples are multi-phased, typically consisting of a primary ThMn 12 -type phase with impurity phases of Fe–Mo alloy, Ce 2 Fe 17 and CeFe 2 . However, nearly pure ThMn 12 -type phase can be obtained either by directly melt spinning at specific wheel speeds or by annealing the over-quenched ribbons at an optimum temperature. The magnetic moment of CeFe 12− x Mo x is found to be affected not only by the number of Fe atoms but also by weakening of the Fe moment from Mo substitution. Nitriding is effective in enhancing the Curie temperature T c and saturation magnetization 4π M s . T c was enhanced by at least 151 °C after nitrogenation for all compositions. The newly identified CeFe 11 Mo compound exhibits the best magnetic properties in the alloy series, having T c = 370 °C and 4π M s > 13.0 kG after nitriding and ( BH ) max = 0.3 MGOe after annealing.
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