Understanding High Coercivity in ThMn12-Type Sm-Zr-Fe-Co-Ti Permanent Magnet Powders through Nanoscale Analysis
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866910751820611584 |
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| author | Polin, Nikita Gabay, Alexander M. Han, Chaoya Chan, Christopher Kim, Se-Ho Ni, Chaoyang Gutfleisch, Oliver Hadjipanayis, George C. Gault, Baptiste |
| author_facet | Polin, Nikita Gabay, Alexander M. Han, Chaoya Chan, Christopher Kim, Se-Ho Ni, Chaoyang Gutfleisch, Oliver Hadjipanayis, George C. Gault, Baptiste |
| contents | ThMn12-type (Sm,Zr)1(Fe,Co,Ti)12 compounds show great potential for permanent magnets. Magnetically hard anisotropic powders prepared via reduction-diffusion exhibit a significant increase in coercivity from 0.45 T to 1.26 T as the processing temperature is raised from 990°C to 1220°C. Structural and microchemical analyses at high-resolution reveal that high-temperature processing annihilates grain boundaries (GBs) and reduces the density of twin boundaries (TBs), which are defects acting as weak links limiting the coercivity in the 1:12 system. Ostwald ripening is proposed as the mechanism behind the reduction of GB and TB densities at higher temperature, driven by the reduction in interfacial energy and enhancing atomic structural uniformity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_06540 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Understanding High Coercivity in ThMn12-Type Sm-Zr-Fe-Co-Ti Permanent Magnet Powders through Nanoscale Analysis Polin, Nikita Gabay, Alexander M. Han, Chaoya Chan, Christopher Kim, Se-Ho Ni, Chaoyang Gutfleisch, Oliver Hadjipanayis, George C. Gault, Baptiste Materials Science ThMn12-type (Sm,Zr)1(Fe,Co,Ti)12 compounds show great potential for permanent magnets. Magnetically hard anisotropic powders prepared via reduction-diffusion exhibit a significant increase in coercivity from 0.45 T to 1.26 T as the processing temperature is raised from 990°C to 1220°C. Structural and microchemical analyses at high-resolution reveal that high-temperature processing annihilates grain boundaries (GBs) and reduces the density of twin boundaries (TBs), which are defects acting as weak links limiting the coercivity in the 1:12 system. Ostwald ripening is proposed as the mechanism behind the reduction of GB and TB densities at higher temperature, driven by the reduction in interfacial energy and enhancing atomic structural uniformity. |
| title | Understanding High Coercivity in ThMn12-Type Sm-Zr-Fe-Co-Ti Permanent Magnet Powders through Nanoscale Analysis |
| topic | Materials Science |
| url | https://arxiv.org/abs/2410.06540 |