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The influence of Tb substitution on the magnetic properties of nanocomposite Pr2Fe14B/α-Fe magnets

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3 Author(s)
Jin, Z.Q. ; Dept. of Phys. & Astron., Delaware Univ., Newark, DE, USA ; Okumura, H. ; Hadjipanayis, G.C.

Tb-doped (Pr,Tb)2Fe14Be/α-Fe nanocomposite ribbons have been synthesized by melt-spinning Pr8-x TbxFe86B6 alloys at low speeds. The effects of Tb substitution and rapid annealing on the magnetic properties of the composites were investigated. With a small addition of Tb, the Curie temperature of hard phase increases slightly, the saturation magnetization decreases but the coercivity increases due to a higher anisotropy field and a refinement of grain size, leading to an enhancement in the energy product. Transmission electron microscopy revealed a finer and more homogeneous (Pr,Tb)2Fe14B/α-Fe microstructure with an average grain size in the range from 20 to 40 nm. The best results are obtained with a room temperature coercivity of 6.6 kOe, Mr=118 emu/g, and (BH)m=15.2 MGOe in Pr7Tb1Fe86B6 sample annealed at 800°C for 1 minute

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Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 4 )