MAGNETIC-PROPERTIES OF MECHANICALLY ALLOYED AL-DOPED FE3SN

When Fe3Sn powders were milled for 30 h, the X-ray diffraction pattern of the as-milled powders revealed a broad peak typical for an amorpho us phase. Nanocrystals appeared after 30-h milling for Al-doped Fe3Sn powders and the amount of nanocrystals increased with the increase of the amount of aluminum doped. Owing to the formation of nanocrystals, the saturation magnetization of the as-milled powders increased with A l doping. However, the coercivity exhibited an opposite tendency compa red with the saturation magnetization. The crystalline phases were obt ained by annealing as-milled powders at 800-degrees-C for 0.5-5 h. The crystalline Fe3Sn phase was formed for an Al (3.63 wt%)-Fe3Sn sam le after 0.5-h annealing with a saturation magnetization of 105 emu/g.