High-performance rare-earth hard magnetic nanoparticles via the calciothermic reduction and chemoselective dissolution
DC Field | Value | Language |
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dc.contributor.author | Yun, Saemee | - |
dc.contributor.author | Koo, Kangmo | - |
dc.contributor.author | Lee, Jimin | - |
dc.contributor.author | Park, Ji Young | - |
dc.contributor.author | Jang, Byungkwon | - |
dc.contributor.author | Han, BoKyeong | - |
dc.contributor.author | Choa, Yong-Ho | - |
dc.date.accessioned | 2023-07-27T12:09:58Z | - |
dc.date.available | 2023-07-27T12:09:58Z | - |
dc.date.created | 2023-06-07 | - |
dc.date.issued | 2023-08 | - |
dc.identifier.issn | 1226-086X | - |
dc.identifier.uri | https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/188323 | - |
dc.description.abstract | Magnetic Nd2Fe14B nanoparticles are synthesized by a bottom-up process via calciothermic reduction, which complements the negative reduction potential of rare-earth elements, thus affording nanoscale products. However, to obtain high-purity, high-performance magnetic nanoparticles, residual calcium by-products that persist after calcium thermal reduction-diffusion must be selectively removed. In previously reported rinsing methods, H2O or H+ diffuse into the magnetic nanoparticles, thereby leading to hydridation. Herein, we propose a novel rinsing solution, NH4NO3/methanol, that does not deteriorate the magnetic properties. The magnetic properties are enhanced by selectively removing calcium by-products (i.e., CaO) from the magnetic nanoparticles with NH4NO3/methanol solution and by preventing hydridation and oxidation using zeolite and Schlenk line. The intrinsic coercivity (Hci) is maintained at 75.1 % (from 8.5 kOe to 6.3 kOe), and the saturation magnetization (Ms) increases two-fold (110.08 emu/g) after rinsing with NH4NO3 solution, compared with prior to rinsing treatment (47.363 emu/g). Rinsing the magnetic nanoparticles with NH4NO3/methanol solutions does not cause deterioration of the obtained Nd2Fe14B nanostructures, where Ms = 112.0 emu/g and Hci = 8.4 kOe after rinsing with NH4NO3/methanol using the zeolite and Schlenk line. Using rinsing methods in previous studies. 3.5 % of the initial coercivity is maintained, whereas with the new rinsing method, 95.2 % of the coercivity is maintained, thus indicating that rinsing does not induce deterioration of the magnetic properties. © 2023 The Korean Society of Industrial and Engineering Chemistry | - |
dc.language | 영어 | - |
dc.language.iso | en | - |
dc.publisher | Korean Society of Industrial Engineering Chemistry | - |
dc.title | High-performance rare-earth hard magnetic nanoparticles via the calciothermic reduction and chemoselective dissolution | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Choa, Yong-Ho | - |
dc.identifier.doi | 10.1016/j.jiec.2023.04.027 | - |
dc.identifier.scopusid | 2-s2.0-85159178331 | - |
dc.identifier.wosid | 001013376200001 | - |
dc.identifier.bibliographicCitation | Journal of Industrial and Engineering Chemistry, v.124, pp.340 - 347 | - |
dc.relation.isPartOf | Journal of Industrial and Engineering Chemistry | - |
dc.citation.title | Journal of Industrial and Engineering Chemistry | - |
dc.citation.volume | 124 | - |
dc.citation.startPage | 340 | - |
dc.citation.endPage | 347 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.isOpenAccess | N | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.description.journalRegisteredClass | kci | - |
dc.relation.journalResearchArea | Chemistry | - |
dc.relation.journalResearchArea | Engineering | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Multidisciplinary | - |
dc.relation.journalWebOfScienceCategory | Engineering, Chemical | - |
dc.subject.keywordPlus | ND-FE-B | - |
dc.subject.keywordPlus | CHEMICAL-SYNTHESIS | - |
dc.subject.keywordPlus | AUTO-COMBUSTION | - |
dc.subject.keywordPlus | NEODYMIUM | - |
dc.subject.keywordPlus | MICROSTRUCTURE | - |
dc.subject.keywordPlus | PARTICLES | - |
dc.subject.keywordPlus | MECHANISM | - |
dc.subject.keywordAuthor | Calciothermic reduction | - |
dc.subject.keywordAuthor | Magnetic properties | - |
dc.subject.keywordAuthor | Nd2Fe14B | - |
dc.subject.keywordAuthor | NH4NO3 | - |
dc.subject.keywordAuthor | Schlenk line | - |
dc.identifier.url | https://www.sciencedirect.com/science/article/pii/S1226086X23002575 | - |
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