High-coercivity Sm2Fe17Nx powders produced by HDDR and nitriding processes

H. Nakamura, S. Sugimoto, M. Okada, M. Homma

Research output: Contribution to journalReview articlepeer-review

26 Citations (Scopus)


This paper describes the occurrence of HDDR (Hydrogenation Disproportionation Desorption Recombination or Hydrogen Decomposition Desorption Recombination) process in the processing of Sm2Fe17Nx powders with high coercivity. The hydrogen absorption and desorption behaviors of the Sm2Fe17 compound were studied. The Sm2Fe17 phase disproportionates into α-Fe and samarium hydrides after the heat treatment in hydrogen at around 600-1100 °C. The removal of hydrogen by following a heat treatment in vacuum so that desorption and recombination occur, results in the reforming of the Sm2Fe17 phase. This Sm2Fe17 phase has a cellular-like microstructure of about 50-500 nm in diameter. The nitrided Sm2Fe17 powders produced by the HDDR process at 775 °C have high coercivity of 8.7 kOe.

Original languageEnglish
Pages (from-to)280-285
Number of pages6
JournalMaterials Chemistry and Physics
Issue number3
Publication statusPublished - 1992 Oct

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics


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