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Anisotropic SmFe 10 V 2 Bulk Magnets with Enhanced Coercivity via Ball Milling Process.

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Title: Anisotropic SmFe 10 V 2 Bulk Magnets with Enhanced Coercivity via Ball Milling Process.
Authors: Zhou, Tian Hong1,2 (AUTHOR) zhouth@kims.re.kr, Zhang, Baochao1 (AUTHOR), Zheng, Xing1 (AUTHOR), Song, Youngwoon1 (AUTHOR), Si, Pingzhan1 (AUTHOR), Choi, Chul-Jin1 (AUTHOR), Cho, Young-Rae2 (AUTHOR) yescho@pusan.ac.kr, Park, Jihoon1 (AUTHOR) yescho@pusan.ac.kr
Source: Nanomaterials (2079-4991). Aug2024, Vol. 14 Issue 16, p1329. 11p.
Subjects: Magnetic properties, Crystal grain boundaries, Grain milling, Remanence, X-ray diffraction
Abstract: Anisotropic bulk magnets of ThMn12-type SmFe10V2 with a high coercivity (Hc) were successfully fabricated. Powders with varying particle sizes were prepared using the ball milling process, where the particle size was controlled with milling time. A decrease in Hc occurred in the heat-treated bulk pressed from large-sized powders, while heavy oxidation excessively occurred in small powders, leading to the decomposition of the SmFe10V2 (1–12) phase. The highest Hc of 8.9 kOe was achieved with powders ball-milled for 5 h due to the formation of the grain boundary phase. To improve the maximum energy product ((BH)max), which is only 2.15 MGOe in the isotropic bulk, anisotropic bulks were prepared using the same powders. The easy alignment direction, confirmed by XRD and EBSD measurements, was <002>. Significant enhancements were observed, with saturation magnetization (Ms) increasing from 59 to 79 emu/g and a remanence ratio (Mr/Ms) of 83.7%. (BH)max reaching 7.85 MGOe. For further improvement of magnetic properties, controlling oxidation is essential to form a uniform grain boundary phase and achieve perfect alignment with small grain size. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Anisotropic SmFe 10 V 2 Bulk Magnets with Enhanced Coercivity via Ball Milling Process.
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Zhou%2C+Tian+Hong%22&quot;&gt;Zhou, Tian Hong&lt;/searchLink&gt;&lt;relatesTo&gt;1,2&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; zhouth@kims.re.kr&lt;/i&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Zhang%2C+Baochao%22&quot;&gt;Zhang, Baochao&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Zheng%2C+Xing%22&quot;&gt;Zheng, Xing&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Song%2C+Youngwoon%22&quot;&gt;Song, Youngwoon&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Si%2C+Pingzhan%22&quot;&gt;Si, Pingzhan&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Choi%2C+Chul-Jin%22&quot;&gt;Choi, Chul-Jin&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Cho%2C+Young-Rae%22&quot;&gt;Cho, Young-Rae&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; yescho@pusan.ac.kr&lt;/i&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Park%2C+Jihoon%22&quot;&gt;Park, Jihoon&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; yescho@pusan.ac.kr&lt;/i&gt;
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  Data: Anisotropic bulk magnets of ThMn12-type SmFe10V2 with a high coercivity (Hc) were successfully fabricated. Powders with varying particle sizes were prepared using the ball milling process, where the particle size was controlled with milling time. A decrease in Hc occurred in the heat-treated bulk pressed from large-sized powders, while heavy oxidation excessively occurred in small powders, leading to the decomposition of the SmFe10V2 (1–12) phase. The highest Hc of 8.9 kOe was achieved with powders ball-milled for 5 h due to the formation of the grain boundary phase. To improve the maximum energy product ((BH)max), which is only 2.15 MGOe in the isotropic bulk, anisotropic bulks were prepared using the same powders. The easy alignment direction, confirmed by XRD and EBSD measurements, was &lt;002&gt;. Significant enhancements were observed, with saturation magnetization (Ms) increasing from 59 to 79 emu/g and a remanence ratio (Mr/Ms) of 83.7%. (BH)max reaching 7.85 MGOe. For further improvement of magnetic properties, controlling oxidation is essential to form a uniform grain boundary phase and achieve perfect alignment with small grain size. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.3390/nano14161329
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      – Code: eng
        Text: English
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        PageCount: 11
        StartPage: 1329
    Subjects:
      – SubjectFull: Magnetic properties
        Type: general
      – SubjectFull: Crystal grain boundaries
        Type: general
      – SubjectFull: Grain milling
        Type: general
      – SubjectFull: Remanence
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      – SubjectFull: X-ray diffraction
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      – TitleFull: Anisotropic SmFe 10 V 2 Bulk Magnets with Enhanced Coercivity via Ball Milling Process.
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            NameFull: Zhou, Tian Hong
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              Text: Aug2024
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