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摘要
Nanocrystalline Ti0.75Zr0.25Fe2+x (x = 0-0.4) and Ti0.75-yByZr0.25Fe2.4 (y = 0-0.35) with high saturation magnetization have been fabricated by the melt-spinning technique. Nanocrystalline Ti0.75Zr0.25Fe2+x consists of the hexagonal C14 Laves phase (Ti,Zr)Fe-2. Fe addition decreases the lattice parameter a and shrinks the cell volume. The antiferromagnetic Fe-Fe interactions may decrease with the increase of x, leading to a significant enhancement of saturation polarization (J(s)) and Curie temperature (T-c). The magnetocrystalline anisotropy constant K also increases with increasing x. Excessive Fe addition (x > 0.25) may induce structural disorder which lowers the J(s) and T-c. Nanocrystalline Ti0.75-yByZr0.25Fe2.4 is composed of hexagonal (Ti, Zr)Fe-2 and Fe-rich amorphous phases with relatively high J(s). The lattice parameters a, c and cell volume V are almost unchanged with the increase of y for y >= 0.16. Simultaneously, the T-c of (Ti,Zr)Fe-2 remains unchanged, indicating that B does not enter this lattice but takes part in forming the amorphous phase, in good agreement with the X-ray diffraction results. The volume fraction of the amorphous phase increases with the increase of B content and results in a large enhancement of J(s) up to 10.8 kG. Further B addition (y > 0.30) decreases J(s), possibly due to the decrease of the J(s) of the amorphous phase.
- 出版日期2014-5-7
