Nuclear magnetic resonance and Mossbauer studies of rapidly quenched and heat-treated Nd<sub>4</sub>Fe<sub>77.5</sub>B<sub>18.5</sub> alloys
Mingxi Mao; Chunli Yang; Zhaohua Cheng; Yide Zhang; Baogen Shen; Linyuan Yang; Fashen Li; Mingxi Mao; Dept. of Phys., Lanzhou Univ., China; Chunli Yang; Dept. of Phys., Lanzhou Univ., China; Zhaohua Cheng; Dept. of Phys., Lanzhou Univ., China; Yide Zhang; Dept. of Phys., Lanzhou Univ., China; Baogen Shen; Dept. of Phys., Lanzhou Univ., China; Linyuan Yang; Dept. of Phys., Lanzhou Univ., China; Fashen Li; Dept. of Phys., Lanzhou Univ., China
Журнал:
Journal of Physics: Condensed Matter
Дата:
1992-11-16
Аннотация:
Using the Mossbauer effect and NMR, and phase compositions of rapidly quenched Nd<sub>4</sub>Fe<sub>77.5</sub>B<sub>18.5</sub> alloy under different heat treatment conditions were studied. It was shown that the sample which was annealed at 670 degrees C for a short time and has the optimal magnetic properties has a main BCT Fe<sub>3</sub>B phase containing Nd atoms and a small amount of alpha -Fe (6%). It is concluded that the hard magnetic properties of crystallized melt-quenched Nd-Fe-B with a low Nd concentration do not originate from the presence of the hard magnetic Nd<sub>2</sub>Fe<sub>14</sub>B phase but from the BCT Fe<sub>3</sub>B phase containing Nd atoms.
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