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A unique synthesis of rare-earth-Co-based single crystal particles by "self-aligned" Co nano-arrays.
Nanoscale ( IF 5.8 ) Pub Date : 2020-05-07 , DOI: 10.1039/d0nr00490a
Qiong Wu 1 , Liying Cong , Ming Yue , Chenglin Li , Zhenhui Ma , Xiangyu Ma , YaTao Wang
Affiliation  

In this study, anisotropic SmCo5 magnets were prepared by a distinctive method, which is the high-temperature reductive annealing of Co@Sm2O3 with a specially designed nanostructure. High resolution transmission electron microscopy and elemental mapping show that the precursor self-assembly is composed of hcp-structured Co nano-rods with a coherent crystallographic orientation. During high temperature reduction, the Sm2O3 shell preserves the original morphology and alignment of these anisotropic Co nano-arrays, providing a template for hcp-structured SmCo5 single crystal particle synthesis. The as-prepared SmCo5 magnets exhibit well-controlled size and morphology, and a high coercivity of 30.9 kOe at room temperature. No stabilizer coating is necessary to prevent the formation of polycrystals in this synthesis.

中文翻译:

通过“自对准” Co纳米阵列独特地合成稀土-Co基单晶颗粒。

在这项研究中,通过独特的方法制备了各向异性的SmCo 5磁体,该方法是对具有特殊设计的纳米结构的Co @ Sm 2 O 3进行高温还原退火。高分辨率透射电子显微镜和元素图谱表明,前体的自组装由具有相干晶体学取向的hcp结构的Co纳米棒组成。在高温还原过程中,Sm 2 O 3壳保留了这些各向异性Co纳米阵列的原始形态和排列,为hcp结构的SmCo 5单晶颗粒合成提供了模板。准备好的S钴5磁铁表现出良好的尺寸和形态控制,在室温下的矫顽力为30.9 kOe。不需要稳定剂涂层来防止在该合成中形成多晶。
更新日期:2020-07-09
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