Development of Multi-Cation-Doped M-Type Hexaferrite Permanent Magnets
We report enhanced permanent magnet performance for multi-cation–substituted M-type Sr-hexaferrites (SrM) prepared using conventional ceramic processes. The final cation composition, Sr<sub>0.4</sub>Ca<sub>0.3</sub>La<sub>0.3</sub>Fe<sub>10.2</sub>Co&l...
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MDPI AG
2022-12-01
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| Online Access: | https://www.mdpi.com/2076-3417/13/1/295 |
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| author | Jun-Pyo Lim Min-Gu Kang Young-Min Kang |
| author_facet | Jun-Pyo Lim Min-Gu Kang Young-Min Kang |
| author_sort | Jun-Pyo Lim |
| collection | DOAJ |
| description | We report enhanced permanent magnet performance for multi-cation–substituted M-type Sr-hexaferrites (SrM) prepared using conventional ceramic processes. The final cation composition, Sr<sub>0.4</sub>Ca<sub>0.3</sub>La<sub>0.3</sub>Fe<sub>10.2</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>Si<sub>0.05</sub>Mg<sub>0.05</sub>O<sub>19</sub>, could be derived through stepwise and systematic cation composition designs, processing, and characterization. The hexaferrites sample sintered in the temperature range of 1200–1220 °C showed an enhanced coercivity (<i>H</i><sub>C</sub>) of approximately 4.0 kOe and a residual magnetic flux density (<i>B</i><sub>r</sub>) of 2.5–2.6 kG. When samples of the same composition were fabricated into anisotropic magnets through a magnetic-field molding process, performance parameters of <i>B</i><sub>r</sub> = 4.42 kG, <i>H</i><sub>C</sub> = 3.57 kOe, and <i>BH</i><sub>max</sub> = 4.70 M·G·Oe were achieved, a significant improvement over <i>B</i><sub>r</sub> = 4.21 kG, <i>H</i><sub>C</sub> = 3.18 kOe, and <i>BH</i><sub>max</sub> = 4.24 M·G·Oe for the non-substituted SrFe<sub>12</sub>O<sub>19</sub> magnet processed under optimized conditions. |
| first_indexed | 2024-03-11T10:08:02Z |
| format | Article |
| id | doaj.art-9c74fff43fe24da5b3e970756ac8f018 |
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| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T10:08:02Z |
| publishDate | 2022-12-01 |
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| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-9c74fff43fe24da5b3e970756ac8f0182023-11-16T14:55:05ZengMDPI AGApplied Sciences2076-34172022-12-0113129510.3390/app13010295Development of Multi-Cation-Doped M-Type Hexaferrite Permanent MagnetsJun-Pyo Lim0Min-Gu Kang1Young-Min Kang2Department of Materials Science & Engineering, Korea National University of Transportation, Chungju 27469, Republic of KoreaDepartment of Materials Science & Engineering, Korea National University of Transportation, Chungju 27469, Republic of KoreaDepartment of Materials Science & Engineering, Korea National University of Transportation, Chungju 27469, Republic of KoreaWe report enhanced permanent magnet performance for multi-cation–substituted M-type Sr-hexaferrites (SrM) prepared using conventional ceramic processes. The final cation composition, Sr<sub>0.4</sub>Ca<sub>0.3</sub>La<sub>0.3</sub>Fe<sub>10.2</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>Si<sub>0.05</sub>Mg<sub>0.05</sub>O<sub>19</sub>, could be derived through stepwise and systematic cation composition designs, processing, and characterization. The hexaferrites sample sintered in the temperature range of 1200–1220 °C showed an enhanced coercivity (<i>H</i><sub>C</sub>) of approximately 4.0 kOe and a residual magnetic flux density (<i>B</i><sub>r</sub>) of 2.5–2.6 kG. When samples of the same composition were fabricated into anisotropic magnets through a magnetic-field molding process, performance parameters of <i>B</i><sub>r</sub> = 4.42 kG, <i>H</i><sub>C</sub> = 3.57 kOe, and <i>BH</i><sub>max</sub> = 4.70 M·G·Oe were achieved, a significant improvement over <i>B</i><sub>r</sub> = 4.21 kG, <i>H</i><sub>C</sub> = 3.18 kOe, and <i>BH</i><sub>max</sub> = 4.24 M·G·Oe for the non-substituted SrFe<sub>12</sub>O<sub>19</sub> magnet processed under optimized conditions.https://www.mdpi.com/2076-3417/13/1/295M-type hexaferritescation substitutioncoercivitysaturation magnetizationpermanent magnet |
| spellingShingle | Jun-Pyo Lim Min-Gu Kang Young-Min Kang Development of Multi-Cation-Doped M-Type Hexaferrite Permanent Magnets Applied Sciences M-type hexaferrites cation substitution coercivity saturation magnetization permanent magnet |
| title | Development of Multi-Cation-Doped M-Type Hexaferrite Permanent Magnets |
| title_full | Development of Multi-Cation-Doped M-Type Hexaferrite Permanent Magnets |
| title_fullStr | Development of Multi-Cation-Doped M-Type Hexaferrite Permanent Magnets |
| title_full_unstemmed | Development of Multi-Cation-Doped M-Type Hexaferrite Permanent Magnets |
| title_short | Development of Multi-Cation-Doped M-Type Hexaferrite Permanent Magnets |
| title_sort | development of multi cation doped m type hexaferrite permanent magnets |
| topic | M-type hexaferrites cation substitution coercivity saturation magnetization permanent magnet |
| url | https://www.mdpi.com/2076-3417/13/1/295 |
| work_keys_str_mv | AT junpyolim developmentofmulticationdopedmtypehexaferritepermanentmagnets AT mingukang developmentofmulticationdopedmtypehexaferritepermanentmagnets AT youngminkang developmentofmulticationdopedmtypehexaferritepermanentmagnets |