A facile synthesis of high performance SmCo5 nanoparticles
A facile synthesis of high performance SmCo5 nanoparticles
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高性能 SmCo5 纳米粒子的简便合成
DOI：
10.1016/j.cej.2014.11.138
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发表时间：
2015-03-15
影响因子：
15.1
通讯作者：
Jiang, Chengbao
中科院分区：
文献类型：
--
作者：
Ma, Zhenhui;Zhang, Tianli;Jiang, Chengbao
SmCo5纳米颗粒在高密度磁存储和磁性纳米复合材料中具有广阔的应用前景。固相合成和钙热还原相结合制备稀土硬磁性纳米颗粒具有明显的优势。在此过程中，Sm2O3前驱体事先在有机溶剂中制备，由于SmCo5纳米颗粒中存在CoC，导致其矫顽力较低。本文介绍了一种在无机体系中制备高性能铁磁性晶体SmCo5纳米粒子的简便方法。将非晶态Sm(OH)(3)和Co(OH)(2)前驱体在900℃下还原退火，制备出矫顽力为20.0 kOe的10 ~ 40 nm SmCo5纳米颗粒，其中CaO的加入可以有效地阻止颗粒的生长。而在1100℃下还原Sm(OH)(3)和Co(OH)(2)晶体，获得了具有可堆叠片状形貌的Sm2Co17多晶颗粒。这种环保的方法成功地避免了CoC的存在，并将矫顽力提高到20.0 kOe。(C) 2014 Elsevier B.V.版权所有
SmCo5 nanoparticles have promising applications in high-density magnetic storage and magnetic nanocomposites. A combination of solution-phase synthesis and calciothermic reduction shows obvious advantage for preparing rare-earth hard magnetic nanoparticles. In this process, the Sm2O3 precursor was previously prepared in organic solvent, leading to a low coercivity due to the presence of CoC in SmCo5 nanoparticles. In this paper, a facile procedure for fabricating high performance ferromagnetic, crystalline SmCo5 nanoparticles in inorganic systerh is approached. 10-40 nm SmCo5 nanoparticles have been prepared with the coercivity of 20.0 kOe by reductive annealing of amorphous Sm(OH)(3) and Co(OH)(2) precursor at 900 degrees C. Thereinto, the addition of CaO can effectively prevent the particles growth. While, polycrystalline Sm2Co17 particles with stackable sheet morphology have been obtained by reduction of crystalline Sm(OH)(3) and Co(OH)(2) at 1100 degrees C. This environmentally friendly method avoids the presence of CoC successfully and improves the coercivity up to 20.0 kOe. (C) 2014 Elsevier B.V. All rights reserved.