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采用液相还原法,通过控制颗粒不同晶面的生长速率,制备了不同尺寸、不同Fe含量的片状FexCo1-x(x=0.1~0.6)合金纳米颗粒,研究了不同成分铁钴合金纳米颗粒的微结构及形状对其磁性的影响。结果表明,当x=0.1时,铁钴合金纳米片为面心立方和密堆六方两相共存结构;当x≥0.2时,铁钴合金纳米片为单相体心立方结构。同块体合金相比,铁钴合金纳米片的点阵发生膨胀。纳米片的饱和磁化强度低于合金相应的块体值,纳米片的矫顽力高于块体及球形纳米颗粒的矫顽力,并且随铁含量的提高而降低。颗粒的片状形貌使得一致取向Fe0.6Co0.4合金纳米片的磁化行为随外场方向而改变,磁化的易轴在面内方向,难轴为纳米片的法线方向。
The FexCo1-x (x = 0.1 ~ 0.6) alloy nanoparticles with different sizes and Fe contents were prepared by liquid-phase reduction method by controlling the growth rate of different crystal planes. The effects of different compositions of Fe-Co alloy nanoparticles The microstructure and shape of its magnetic effects. The results show that when x = 0.1, the iron-cobalt alloy nanosheets are face-centered cubic and close-packed hexagonal two-phase coexistence structure; when x≥0.2, the iron-cobalt alloy nanosheets are single-phase body-centered cubic structure. Compared with the bulk alloy, iron-cobalt alloy nanosheet lattice expansion. The saturation magnetization of the nanosheets is lower than the corresponding bulk values of the alloys. The coercivity of the nanosheets is higher than that of the bulk and spherical nanoparticles, and decreases with the increase of the iron content. The flaky morphology of the particles makes the magnetization behavior of the uniformly oriented Fe0.6Co0.4 alloy nanosheets change with the direction of the external field. The easy axis of magnetization is in the in-plane direction and the hard axis is the normal direction of the nanosheet.