采用表面活性剂增强高能球磨技术及颗粒清洗、分级筛选工艺, 制备了具有较高矫顽力、颗粒尺寸分布狭窄的SmCo5纳米颗粒与纳米薄片, 利用XRD, SEM, TEM, 激光粒径分析(LPSA)和振动样品磁强计(VSM)等手段分别对其相结构、微观形貌、颗粒尺寸分布及磁性能进行了表征. 结果表明, 平均颗粒尺寸分别为9.8和47.5 nm的SmCo5 纳米颗粒, 其室温矫顽力分别为6.8×10$4和7.3×105 A/m; SmCo5纳米薄片的平均颗粒尺寸为1.4 μm, 平均厚度为 75 nm, 具有明显的c轴织构和较强的磁各向异性, 其难磁化轴和易磁化轴上的室温矫顽力分别可达5.5×105和1.6× 106 A/m; SmCo5纳米颗粒和纳米薄片的矫顽力表现出显著的颗粒尺寸依赖性.
Surfactant-assisted high energy ball milling technique is a new method of producing magnetic nanoparticles. In this study, permanent magnetic SmCo5 nanoparticles and nanoflakes with high room-temperature coercivity values and narrow particle size distributions were produced by this technology and a subsequent size-selection process. The SmCo5 nanoparticles with average particle sizes of 9.8 and 47.5 nm, exhibited room-temperature coercivity values of 6.8×104 and 7.3×105 A/m, respectively, while the SmCo5 nanoflakes, with the mean particle size of about 1.4 μm and average thickness of 75 nm, showed excellent permanent magnetic properties with an obvious c-axis crystal texture, a strong magnetic anisotropy and high coercivity values of 5.5×105 and 1.6×106 A/m in their easy-axis and hard-axis directions, respectively. The coercivity values of SmCo5 nanoparticles and nanoflakes exhibited a significant particle size dependance effect.
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