AIP Advances (Feb 2013)

Curie temperature rising by fluorination for Sm2Fe17

  • Matahiro Komuro,
  • Yuichi Satsu,
  • Kazuya Nishi,
  • Takayuki Kanda

DOI
https://doi.org/10.1063/1.4790657
Journal volume & issue
Vol. 3, no. 2
pp. 022107 – 022107

Abstract

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Fluorine atoms can be introduced to Sm2Fe17 using XeF2 below 423 K. The resulting fluorinated Sm2Fe17 powders have ferromagnetic phases containing Sm2Fe17FY1(0<Y1<1), Sm2Fe17FY2 (1<Y2<4), Sm2Fe17, and α-Fe. The unit cell for Sm2Fe17 is elongated by the fluorination. The largest unit cell volume among the rhombohedral Sm2Fe17 compounds is 83.8 nm3, which is 5.8% larger than Sm2Fe17. The rhombohedral Sm2Fe17 with the largest unit cell volume is dissociated above 873 K, and fluorination increases Curie temperature from 403 K for Sm2Fe17 to 675 K. This increase can be explained by the magneto-volume effect.