Abstract
The magnetic phase transition taking place in melt-spun NdFe 2 alloy during annealing has been discussed. The high coercive ( i H c = 2–3.5 kOe) NdFe 7 phase at a Curie temperature 230–235°C is found to be formed in the melt-spun NdFe 2 alloy. The NdFe 7 phase transforms into Nd 5Fe 17 and Nd 2Fe 17 together with the Nd-rich phase under a vacuum atmosphere. Under a controlled oxygen atmosphere, the NdFe 7 and (Nd-rich) phases transform directly into Nd 2O 3 and α-Fe. The Nd 5Fe 17 phase is observed to be magnetically soft ( i H c = 0.18 kOe) and to exhibit a higher Curie temperature ( T c = 240–245°C) than that of the NdFe 7 phase. The melt-spun NdFe 2 alloy shows a magnetic anomaly indicating the spin reorientation of NdFe 7 crystallizes at 325–350 K.
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