A unique synthesis of rare-earth-Co-based single crystal particles by "self-aligned" Co nano-arrays
A unique synthesis of rare-earth-Co-based single crystal particles by "self-aligned" Co nano-arrays
复制标题
通过“自排列”钴纳米阵列独特合成稀土钴基单晶颗粒
DOI：
10.1039/d0nr00490a
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发表时间：
2020
期刊：
影响因子：
6.7
通讯作者：
Wang YaTao
中科院分区：
文献类型：
--
作者：
Wu Qiong;Cong Liying;Yue Ming;Li Chenglin;Ma Zhenhui;Ma Xiangyu;Wang YaTao
在这项研究中，各向异性SmCo5磁体的制备通过一个独特的方法，这是高温还原退火的Co@Sm2O3与一个特殊设计的纳米结构。高分辨率透射电子显微镜和元素映射表明，前体自组装体由具有相干晶体取向的hcp结构的Co纳米棒组成。在高温还原过程中，Sm2O3壳层保留了这些各向异性Co纳米阵列的原始形态和排列，为六方晶系SmCo5单晶颗粒的合成提供了模板。所制备的SmCo5磁体表现出良好的控制的尺寸和形态，和在室温下的30.9 kOe的高矫顽力。不需要稳定剂涂层来防止在该合成中形成多晶体。
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.