期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 41, 页码 14509-14512出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201907763
关键词
flame reaction; permanent magnets; rare-earth-metal magnets
资金
- National Natural Science Foundation of China [51806115, 51701109] Funding Source: Medline
We report a flame-reaction method to synthesize high-performance SmxCoy (x=1, y=5; x=2, y=17) particles on a multigram scale. This flame reaction allows the controlled decomposition of Sm(NO3)(3) and Co(NO3)(2) to 320 nm SmCo-O (SmCoO3 + Co3O4) particles. A 5.8 g sample of SmCo3.8-O particles was coated with CaO and then reduced at 900 degrees C by Ca to give 4.2 g of 260 nm SmCo5 particles. The SmCo5 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 SmCo5 made by chemical methods. This synthesis can be extended to synthesize Sm2Co17 particles, providing a general approach to scaling up the synthesis of high-performance SmxCoy nanomagnets for permanent magnet applications.
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