Rare earth-cobalt hard magnetic nanoparticles and nanoflakes by high-energy milling
Rare earth-cobalt hard magnetic nanoparticles and nanoflakes by high-energy milling
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DOI：
10.1088/0953-8984/22/16/164213
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发表时间：
2010-04-28
影响因子：
2.7
通讯作者：
Hadjipanayis, G. C.
中科院分区：
文献类型：
--
作者：
Gabay, A. M.;Akdogan, N. G.;Hadjipanayis, G. C.
高能球磨是一种大规模制备稀土-过渡金属纳米粒子的有效方法。在这项工作中，我们报告了晶体各向异性SmCo（5），PrCo（5）和Sm（2）（Co，Fe）（17）纳米粒子（粒径小于10 nm）的表面活性剂辅助球磨获得，并研究其尺寸和性能作为一个功能的研磨条件。通过研磨纳米晶前体合金，我们获得了约100 nm厚的SmCo 5片晶（薄片），纵横比高达10（2）-10（3）。这种脆性材料的不寻常的形状演变归因于其在纳米晶状态下的塑性增加。纳米片易受再结晶退火的影响，并表现出高达19 kOe的室温介电常数。稀土钴纳米颗粒和超薄薄片的成功制备为纳米复合永磁材料的发展提供了希望。
High-energy ball milling has been shown to be a promising method for large-scale fabrication of rare earth-transition metal nanoparticles. In this work, we report crystallographically anisotropic SmCo(5), PrCo(5) and Sm(2)(Co, Fe)(17) nanoparticles (particle size smaller than 10 nm) obtained by surfactant-assisted ball milling and study their size and properties as a function of the milling conditions. By milling nanocrystalline precursor alloys, we obtained SmCo5 platelets (flakes) approximately 100 nm thick with an aspect ratio as high as 10(2)-10(3). The unusual shape evolution of this brittle material is attributed to its increased plasticity in the nanocrystalline state. The nanoflakes are susceptible to re-crystallization annealing and exhibit a room-temperature coercivity of up to 19 kOe. The successful fabrication of rare earth-cobalt nanoparticles and ultra-thin flakes provides hope for the development of nanocomposite permanent magnets with an enhanced energy product.