Chemical synthesis of Nd2Fe14B/Fe-Co nanocomposite with high magnetic energy productopen access
- Authors
- Ngo, Hieu Minh; Lee, Gyutae; Haider, Syed Kamran; Pal, Umapada; Hawari, Thomi; Kim, Kyung Min; Kim, Jongryoul; Kwon, Hae-Woong; Kang, Young Soo
- Issue Date
- Oct-2021
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- RSC ADVANCES, v.11, no.51, pp 32376 - 32382
- Pages
- 7
- Indexed
- SCIE
SCOPUS
- Journal Title
- RSC ADVANCES
- Volume
- 11
- Number
- 51
- Start Page
- 32376
- End Page
- 32382
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/108165
- DOI
- 10.1039/d1ra03760a
- ISSN
- 2046-2069
2046-2069
- 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.
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Collections - COLLEGE OF ENGINEERING SCIENCES > DEPARTMENT OF MATERIALS SCIENCE AND CHEMICAL ENGINEERING > 1. Journal Articles
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