High coercivity SmCo5 synthesized with assistance of colloidal SiO2
Abstract SmCo5 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 SmCo5 with optimal size and high coercivity. In this paper,...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2021-02-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-021-83826-5 |
| _version_ | 1818996311233396736 |
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| author | Hao Tang Mohammad Aref Hasen Mamakhel Mogens Christensen |
| author_facet | Hao Tang Mohammad Aref Hasen Mamakhel Mogens Christensen |
| author_sort | Hao Tang |
| collection | DOAJ |
| description | Abstract SmCo5 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 SmCo5 with optimal size and high coercivity. In this paper, we report on the successful synthesis of phase pure SmCo5 with spherical/prolate spheroids shape. Size control is obtained by utilizing colloidal SiO2 as a template preventing aggregation and growth of the precursor. The amount of SiO2 nanoparticles (NPs) in the precursor tunes the average particle size (APS) of the synthesized SmCo5 with particle dimension from 740 to 504 nm. As-prepared pure SmCo5 fine powder obtained from using 2 ml SiO2 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 SiO2 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. |
| first_indexed | 2024-12-20T21:27:43Z |
| format | Article |
| id | doaj.art-d663a4bc24ea4e0090f20ca343a7f233 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-20T21:27:43Z |
| publishDate | 2021-02-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-d663a4bc24ea4e0090f20ca343a7f2332022-12-21T19:26:07ZengNature PortfolioScientific Reports2045-23222021-02-011111810.1038/s41598-021-83826-5High coercivity SmCo5 synthesized with assistance of colloidal SiO2Hao Tang0Mohammad Aref Hasen Mamakhel1Mogens Christensen2Center for Materials Crystallography (CMC), Department of Chemistry, Aarhus UniversityCenter for Materials Crystallography (CMC), Department of Chemistry, Aarhus UniversityCenter for Materials Crystallography (CMC), Department of Chemistry, Aarhus UniversityAbstract SmCo5 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 SmCo5 with optimal size and high coercivity. In this paper, we report on the successful synthesis of phase pure SmCo5 with spherical/prolate spheroids shape. Size control is obtained by utilizing colloidal SiO2 as a template preventing aggregation and growth of the precursor. The amount of SiO2 nanoparticles (NPs) in the precursor tunes the average particle size (APS) of the synthesized SmCo5 with particle dimension from 740 to 504 nm. As-prepared pure SmCo5 fine powder obtained from using 2 ml SiO2 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 SiO2 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.https://doi.org/10.1038/s41598-021-83826-5 |
| spellingShingle | Hao Tang Mohammad Aref Hasen Mamakhel Mogens Christensen High coercivity SmCo5 synthesized with assistance of colloidal SiO2 Scientific Reports |
| title | High coercivity SmCo5 synthesized with assistance of colloidal SiO2 |
| title_full | High coercivity SmCo5 synthesized with assistance of colloidal SiO2 |
| title_fullStr | High coercivity SmCo5 synthesized with assistance of colloidal SiO2 |
| title_full_unstemmed | High coercivity SmCo5 synthesized with assistance of colloidal SiO2 |
| title_short | High coercivity SmCo5 synthesized with assistance of colloidal SiO2 |
| title_sort | high coercivity smco5 synthesized with assistance of colloidal sio2 |
| url | https://doi.org/10.1038/s41598-021-83826-5 |
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