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A unique synthesis of rare-earth-Co-based single crystal particles by “self-aligned” Co nano-arrays

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Abstract

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.

Graphical abstract: A unique synthesis of rare-earth-Co-based single crystal particles by “self-aligned” Co nano-arrays

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Article information


Submitted
17 Jan 2020
Accepted
01 May 2020
First published
07 May 2020

Nanoscale, 2020, Advance Article
Article type
Paper

A unique synthesis of rare-earth-Co-based single crystal particles by “self-aligned” Co nano-arrays

Q. Wu, L. Cong, M. Yue, C. Li, Z. Ma, X. Ma and Y. Wang, Nanoscale, 2020, Advance Article , DOI: 10.1039/D0NR00490A

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