High coercivity Pr2Fe14B magnetic nanoparticles by a mechanochemical method. Issue 20 (29th March 2021)

• Record Type: Journal Article
• Authors: Shang, Xiaoyun; Tu, Haoran; Zhang, Jingjing; Ni, Bingying; Wang, Liying; Wang, Minggang; Wu, Chen; Zhao, Zhankui
• Is Part Of: RSC advances. Volume 11:Issue 20(2021)
• Page Start: 12315
• Page End: 12320
• Publication Date: 2021-03-29
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1ra01846a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Nd2 Fe14 B nanoparticles are widely used because of their outstanding hard magnetic properties. Abstract : Nd2 Fe14 B nanoparticles are widely used because of their outstanding hard magnetic properties. In fact, Pr2 Fe14 B has higher magneto-crystalline anisotropy than Nd2 Fe14 B, which makes Pr-Fe-B a promising magnetic material. However, the chemical synthesis route to Pr2 Fe14 B nanoparticles is challenging because of the higher reduction potential of Pr 3+, as well as the complex annealing conditions. In this work, Pr2 Fe14 B nanoparticles were successfully synthesized via an efficient and green mechanochemical method consisting of high energy ball milling, annealing, and a washing process. Microstructural investigations revealed that the oxide precursors were uniformly wrapped by CaO and CaH2, which formed an embedded structure after ball milling. Then, Pr2 Fe14 B powder was synthesized via a time-saving annealing process. The impact of the Pr2 O3 content and the preparation conditions was investigated. The coercivity of the as-annealed powder with 100 wt% Pr2 O3 excess is 18.9 kOe. After magnetic alignment, the coercivity, remanence, and maximum energy product were: 9.8 kOe, 78.4 emu g −1, and 9.8 MGOe, respectively. The present work provides a promising strategy for preparing anisotropic Pr-Fe-B permanent magnetic materials.