Anisotropic Growth and Magnetic Properties of α″-Fe<sub>16</sub>N<sub>2</sub>@C Nanocones
α″-Fe<sub>16</sub>N<sub>2</sub> nanomaterials with a shape anisotropy for high coercivity performance are of interest in potential applications such as rare-earth-free permanent magnets, which are difficult to synthesize in situ anisotropic growth. Here, we develop a new and...
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MDPI AG
2021-03-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/11/4/890 |
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| author | Yong Li Qifeng Kuang Xiaoling Men Shenggang Wang Da Li Chuljin Choi Zhidong Zhang |
| author_facet | Yong Li Qifeng Kuang Xiaoling Men Shenggang Wang Da Li Chuljin Choi Zhidong Zhang |
| author_sort | Yong Li |
| collection | DOAJ |
| description | α″-Fe<sub>16</sub>N<sub>2</sub> nanomaterials with a shape anisotropy for high coercivity performance are of interest in potential applications such as rare-earth-free permanent magnets, which are difficult to synthesize in situ anisotropic growth. Here, we develop a new and facile one-pot microemulsion method with Fe(CO)<sub>5</sub> as the iron source and tetraethylenepentamine (TEPA) as the N/C source at low synthesis temperatures to fabricate carbon-coated tetragonal α″-Fe<sub>16</sub>N<sub>2</sub> nanocones. Magnetocrystalline anisotropy energy is suggested as the driving force for the anisotropic growth of α″-Fe<sub>16</sub>N<sub>2</sub>@C nanocones because the easy magnetization direction of tetragonal α″-Fe<sub>16</sub>N<sub>2</sub> nanocrystals is along the c axis. The α″-Fe<sub>16</sub>N<sub>2</sub>@C nanocones agglomerate to form a fan-like microstructure, in which the thin ends of nanocones direct to its center, due to the magnetostatic energy. The lengths of α″-Fe<sub>16</sub>N<sub>2</sub>@C nanocones are ~200 nm and the diameters vary from ~10 nm on one end to ~40 nm on the other end. Carbon shells with a thickness of 2–3 nm protect α″-Fe<sub>16</sub>N<sub>2</sub> nanocones from oxidation in air atmosphere. The α″-Fe<sub>16</sub>N<sub>2</sub>@C nanocones synthesized at 433 K show a room-temperature saturation magnetization of 82.6 emu/g and a coercive force of 320 Oe. |
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| institution | Directory Open Access Journal |
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| language | English |
| last_indexed | 2024-03-10T12:44:40Z |
| publishDate | 2021-03-01 |
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| series | Nanomaterials |
| spelling | doaj.art-8e3d4d36c8c74b968845b7a0abe8857e2023-11-21T13:33:58ZengMDPI AGNanomaterials2079-49912021-03-0111489010.3390/nano11040890Anisotropic Growth and Magnetic Properties of α″-Fe<sub>16</sub>N<sub>2</sub>@C NanoconesYong Li0Qifeng Kuang1Xiaoling Men2Shenggang Wang3Da Li4Chuljin Choi5Zhidong Zhang6Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, ChinaKorea Institute of Materials Science, 797 Changwondaero, Seongsangu, Changwon 51508, Gyeongnam, KoreaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, Chinaα″-Fe<sub>16</sub>N<sub>2</sub> nanomaterials with a shape anisotropy for high coercivity performance are of interest in potential applications such as rare-earth-free permanent magnets, which are difficult to synthesize in situ anisotropic growth. Here, we develop a new and facile one-pot microemulsion method with Fe(CO)<sub>5</sub> as the iron source and tetraethylenepentamine (TEPA) as the N/C source at low synthesis temperatures to fabricate carbon-coated tetragonal α″-Fe<sub>16</sub>N<sub>2</sub> nanocones. Magnetocrystalline anisotropy energy is suggested as the driving force for the anisotropic growth of α″-Fe<sub>16</sub>N<sub>2</sub>@C nanocones because the easy magnetization direction of tetragonal α″-Fe<sub>16</sub>N<sub>2</sub> nanocrystals is along the c axis. The α″-Fe<sub>16</sub>N<sub>2</sub>@C nanocones agglomerate to form a fan-like microstructure, in which the thin ends of nanocones direct to its center, due to the magnetostatic energy. The lengths of α″-Fe<sub>16</sub>N<sub>2</sub>@C nanocones are ~200 nm and the diameters vary from ~10 nm on one end to ~40 nm on the other end. Carbon shells with a thickness of 2–3 nm protect α″-Fe<sub>16</sub>N<sub>2</sub> nanocones from oxidation in air atmosphere. The α″-Fe<sub>16</sub>N<sub>2</sub>@C nanocones synthesized at 433 K show a room-temperature saturation magnetization of 82.6 emu/g and a coercive force of 320 Oe.https://www.mdpi.com/2079-4991/11/4/890α″-Fe<sub>16</sub>N<sub>2</sub>permanent magnetic materialone-dimensional nanoconescore/shell structureanisotropic growthchemical solution method |
| spellingShingle | Yong Li Qifeng Kuang Xiaoling Men Shenggang Wang Da Li Chuljin Choi Zhidong Zhang Anisotropic Growth and Magnetic Properties of α″-Fe<sub>16</sub>N<sub>2</sub>@C Nanocones Nanomaterials α″-Fe<sub>16</sub>N<sub>2</sub> permanent magnetic material one-dimensional nanocones core/shell structure anisotropic growth chemical solution method |
| title | Anisotropic Growth and Magnetic Properties of α″-Fe<sub>16</sub>N<sub>2</sub>@C Nanocones |
| title_full | Anisotropic Growth and Magnetic Properties of α″-Fe<sub>16</sub>N<sub>2</sub>@C Nanocones |
| title_fullStr | Anisotropic Growth and Magnetic Properties of α″-Fe<sub>16</sub>N<sub>2</sub>@C Nanocones |
| title_full_unstemmed | Anisotropic Growth and Magnetic Properties of α″-Fe<sub>16</sub>N<sub>2</sub>@C Nanocones |
| title_short | Anisotropic Growth and Magnetic Properties of α″-Fe<sub>16</sub>N<sub>2</sub>@C Nanocones |
| title_sort | anisotropic growth and magnetic properties of α fe sub 16 sub n sub 2 sub c nanocones |
| topic | α″-Fe<sub>16</sub>N<sub>2</sub> permanent magnetic material one-dimensional nanocones core/shell structure anisotropic growth chemical solution method |
| url | https://www.mdpi.com/2079-4991/11/4/890 |
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