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A Flame‐Reaction Method for the Large‐Scale Synthesis of High‐Performance Sm x Co y Nanomagnets
Author(s) -
Ma Zhenhui,
Tian Hui,
Cong Liying,
Wu Qiong,
Yue Ming,
Sun Shouheng
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201907763
Subject(s) - nanomagnet , coercivity , materials science , ferromagnetism , decomposition , magnet , analytical chemistry (journal) , nanotechnology , chemical engineering , magnetization , condensed matter physics , chemistry , physics , magnetic field , organic chemistry , quantum mechanics , engineering , chromatography
We report a flame‐reaction method to synthesize high‐performance Sm x Co y ( x =1, y =5; x =2, y =17) particles on a multigram scale. This flame reaction allows the controlled decomposition of Sm(NO 3 ) 3 and Co(NO 3 ) 2 to 320 nm SmCo‐O (SmCoO 3 + Co 3 O 4 ) particles. A 5.8 g sample of SmCo 3.8 ‐O particles was coated with CaO and then reduced at 900 °C by Ca to give 4.2 g of 260 nm SmCo 5 particles. The SmCo 5 particles are strongly ferromagnetic and the aligned particles in epoxy resin exhibit a large room‐temperature coercivity (H c ) of 41.8 kOe and giant (BH) max (maximum magnetic energy product) of 19.6 MGOe, the highest value ever reported for SmCo 5 made by chemical methods. This synthesis can be extended to synthesize Sm 2 Co 17 particles, providing a general approach to scaling up the synthesis of high‐performance Sm x Co y nanomagnets for permanent magnet applications.