Abstract
The magnetic phase transition taking place in melt-spun NdFe 2 alloys during annealing is discussed. The high intrinsic coercive force ( i H c = 2–3.5 kOe) of NdFe 7 phase exhibiting a Curie temperature of 230–235 °C was found to form in the melt-spun NdFe 2 alloy. The NdFe 7 phase transforms into Nd 5Fe 17 plus Nd 2Fe 17 in association with a Nd-rich phase under a vacuum atmosphere. Under an oxygen-controlled atmosphere, the NdFe 7+ (Nd-rich) phases transform directly into Nd 2O 3 plus α-Fe. The Nd 5Fe 17 phase is observed to be magnetically soft ( i H c = 0.18 kOe) and exhibits a rather 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 at 325–350 K indicating the spin reorientation in NdFe 7 crystals.
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