Chemical synthesis of Nd2Fe14B/Fe-Co nanocomposite with high magnetic energy product
- Title
- Chemical synthesis of Nd2Fe14B/Fe-Co nanocomposite with high magnetic energy product
- Author
- 김종렬
- Issue Date
- 2021-10
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- RSC ADVANCES, v. 11, NO. 51, Page. 32376-32382
- Abstract
- Nd2Fe14B is one of the most popular permanent magnets (PMs) possessing the best energy product (BH)(max) among the common PM materials. However, exchange-coupled nanocomposite magnets fabricated by embedding nanostructures of soft-phase magnetic materials into a hard-phase magnetic matrix manifest higher remanence and a higher energy product. Here we present the fabrication of exchange coupled Nd2Fe14B/Fe-Co magnetic nanocomposites using gel-combustion and diffusion-reduction processes. Pre-fabricated CoFe2O4 nanoparticles (NPs) of similar to 5 nm diameter were incorporated into a Nd-Fe-B oxide matrix during its synthesis by gel-combustion. The obtained mixed oxide was further processed with oxidative annealing at 800 degrees C for 2 h and reductive annealing at 900 degrees C for 2 h to form a Nd2Fe14B/Fe-Co nanocomposite. Nanocomposites with different mol% of soft-phase were prepared and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and physical property measurement system (PPMS) to study their crystalline phase, morphology and magnetic behavior. Addition of 7.7 mol% of soft-phase was found to be optimum, producing a coercivity (H-c) of 5.6 kOe and remanence (M-r) of 54 emu g(-1) in the nanocomposite.
- URI
- https://pubs.rsc.org/en/content/articlelanding/2021/RA/D1RA03760Ahttps://repository.hanyang.ac.kr/handle/20.500.11754/182879
- ISSN
- 2046-2069;2046-2069
- DOI
- 10.1039/d1ra03760a
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
- Files in This Item:
- 82489_김종렬.pdfDownload
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