Influence of the type of surfactant and hot compaction on the magnetic properties of SmCo5 nanoflakes
Influence of the type of surfactant and hot compaction on the magnetic properties of SmCo5 nanoflakes
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DOI：
10.1063/1.3561443
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发表时间：
2011-04
影响因子：
3.2
通讯作者：
Liyun Zheng;A. Gabay;Wanfeng Li;B. Cui;G. Hadjipanayis
中科院分区：
文献类型：
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作者：
Liyun Zheng;A. Gabay;Wanfeng Li;B. Cui;G. Hadjipanayis
在这项研究中，我们讨论了一种表面活性剂(油胺、油酸和三辛胺)和热压对表面活性剂辅助高能球磨制备的结晶各向异性SmCo5纳米晶的硬磁性能的影响。用X射线衍射仪、扫描电子显微镜和振动样品磁强计研究了热压SmCo5的物相、微观结构和磁性能。用油胺、油酸和三辛胺制备的前驱体磁化强度分别为14.9、15.8和15kOe。用油酸研磨的纳米片制备的热压SmCo5磁体的矫顽力最低，为8.1Koe。我们认为，即使在不同溶剂的超声波浴中反复洗涤，在热压过程中，SmCo5纳米片中残留的油酸也导致了SmCo5在纳米片表面/界面的氧化。用球磨后的纳米片制备了致密的SmCo5磁体，并对其性能进行了研究。
In this study, we discuss the effects of a type of surfactant (oleylamine, oleic acid, and trioctylamine) and hot pressing on the hard magnetic properties of crystallographically anisotropic SmCo5 nanoflakes prepared by surfactant-assisted high energy ball milling. The phase, microstructure, and magnetic properties of the hot-pressed SmCo5 were investigated by using x-ray diffraction, scanning electron microscopy, and vibrating sample magnetometry. The coercivities of the precursor flakes prepared using oleylamine, oleic acid, and trioctylamine were 14.9, 15.8, and 15 kOe, respectively. Hot-compacted SmCo5 magnets prepared from the nanoflakes milled with oleic acid had the lowest coercivity of 8.1 kOe. It is believed that even after repeated washing in an ultrasonic bath with different solvents, the remaining oleic acid in the SmCo5 nanoflakes led to oxidation of SmCo5 at the surface/interface of nanoflakes during the hot-pressing process. The compacted SmCo5 magnets prepared from the nanoflakes milled wi...