High coercivity SmCo5 synthesized with assistance of colloidal SiO2
| Autor: | Mogens Christensen, Mohammad Aref Hasen Mamakhel, Hao Tang |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Multidisciplinary
Materials science Science 02 engineering and technology Coercivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Suspension (chemistry) Magnetization Colloid Chemical engineering Magnet Phase (matter) Particle Medicine Particle size 0210 nano-technology ddc:600 |
| Zdroj: | Tang, H, Mamakhel, M A H & Christensen, M 2021, ' High coercivity SmCo 5 synthesized with assistance of colloidal SiO 2 ', Scientific Reports, vol. 11, 4682 . https://doi.org/10.1038/s41598-021-83826-5 Scientific Reports, Vol 11, Iss 1, Pp 1-8 (2021) Scientific reports 11(1), 4682 (1-8) (2021). doi:10.1038/s41598-021-83826-5 |
| Popis: | Scientific reports 11(1), 4682 (1-8) (2021). doi:10.1038/s41598-021-83826-5 SmCo$_5$ is one of the most promising candidates for achieving a hard magnet with a high coercivity. Usually, composition, morphology, and size determine the coercivity of a magnet, however, it is challenging to synthesize phase pure SmCo$_5$ with optimal size and high coercivity. In this paper, we report on the successful synthesis of phase pure SmCo$_5$ with spherical/prolate spheroids shape. Size control is obtained by utilizing colloidal SiO$_2$ as a template preventing aggregation and growth of the precursor. The amount of SiO$_2$ nanoparticles (NPs) in the precursor tunes the average particle size (APS) of the synthesized SmCo$_5$ with particle dimension from 740 to 504 nm. As-prepared pure SmCo$_5$ fine powder obtained from using 2 ml SiO$_2$ suspension possesses an APS of 625 nm and exhibits an excellent coercivity of 2986 kA m$^{−1}$ (37.5 kOe) without alignment of the particles prior to magnetisation measurements. Comparing with a reference sample prepared without adding any SiO$_2$ NPs, an enhancement of 35% of the coercivity was achieved. The improvement is due to phase purity, stable single-domain (SSD) size, and shape anisotropy originating from the prolate spheroid particles. Published by Macmillan Publishers Limited, part of Springer Nature, [London] |
| Databáze: | OpenAIRE |
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