A thermodynamic study of the HDDR conditions in the Sm2Fe17Nx compound

Satoshi Ohga, Satoshi Sugimoto, Nobuki Tezuka, Toshio Kagotani, Koichiro Inomata

Research output: Contribution to journalArticlepeer-review


This paper describes the relationship between hydrogen pressure and temperature (P-T curve) in the HDDR treatment of the Sm2 Fe17 compound. The P-T curve suggested that the HDDR condition of the Sm2Fe17 compound is more sensitive to temperature than that of the Nd2Fe14B compound. It was also found that the HDDR treatment of the Sm2Fe17 compound has to be controlled in the hydrogen pressure range of one order lower than that of the Nd2Fe14B compound, because of its lower optimum HDDR temperature. Using the P-T curve, new HDDR treatments named v-HD and s-DR, were carried out in order to induce anisotropic feature. However, the normalized remanence of the new HDDR treated powders was around 0.52, which suggested that the powders were almost magnetically isotropic.

Original languageEnglish
Pages (from-to)459-461
Number of pages3
JournalMaterials Transactions
Issue number3
Publication statusPublished - 2002 Mar


  • Disproportionation
  • Hydrogen pressure
  • Hydrogenalion-disproportionation-desorption-recombination (HDDR)
  • Magnetic anisotropy
  • P-T curve
  • Recombination
  • Samarium-iron compound


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