Development of a new rare earth-free permanent magnet based on Sb-doped Fe3Sn

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phase diagrams

This CMI-funded research was conducted at Ames Laboratory 


  • Theory suggests that uniaxial anisotropy in the rare-earth-free hexagonal Fe3Sn can be achieved by Sb-doping at levels greater than 20%
  • Using high-pressure synthesis, a new phase of Fe3Sn0.78Sn0.22 was discovered which crystallizes in cubic structure type instead of hexagonal (as in parent Fe3Sn)

Significance and Impact:
The heat treatment of the new cubic phase offers potential for the development of biphasic microstructure (cubic-hexagonal) and a strong rare-earth-free permanent magnet

Details and Next Steps:
Measurement of intrinsic magnetic properties to confirm the uniaxial anisotropy of the Sb-doped Fe3Sn system and microstructure development