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Vol.30, No.3, 308 ~ 317, 1992
Title
Phase Transition and Magnetic Properties of Rapidly Solidified Nd - Fe Alloys
최승덕C . J . Yang, 이우영W . Y . Lee, 양충진S . D . Choi
Abstract
The magnetic phase transition taking place in melt-spun NdFe₂ alloys during annealing has been discussed. The high intrinsic coercive force(iHc=2∼3.5kOe) of NdFe_7(rhombohedral system of hexagonal cell) plus a Nd-rich(85∼90 at% Nd) matrix. After annealing the NdFe_7, phase exhibiting a Curie temperature of 230∼235℃ was found to form in the melt-spun NdFe₂ alloy. The NdFe_7 phase transforms into Nd_5Fe_(17) plus Nd₂Fe_(17) together with Nd-rich phase under a vacuum atmosphere. Under an oxygen-controlled atmosphere, the NdFe_7+(Nd-rich) phases transform directly into Nd₂O₃ plus α-Fe. The Nd_5Fe_7 phase is observed to be magnetically soft(iHc=0.18 kOe) and exhibits a higher Curie temperature(Tc=240∼245℃) than that of the NdFe_7, phase. The melt-spun NdFe₂ alloy shows a magnetic anomaly indicating the spin reorientation of NdFe_7 crystals at 325∼350 K.
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