Nitridation kinetics of Sm2Fe17 probed using Mössbauer spectroscopy

The Structure and Magnetic Properties of Sm2Fe17Cx Compounds Prepared from Ball-Milled Mixtures of Sm2Fe17 and Carbon Nanotubes or Graphite

“…After annealing, the hyperfine field parameter values µ0Hhf (Table 2) of Fe atoms located in each of the Sm2Fe17Cx lattice sites increased (by 12% on average), which indicates the change in the site surrounding (distances, neighbors) induced by the interstitial carbon presence. A similar effect was reported for the nitrogenation process of Sm2Fe17, where the 'nitrogen-poor' Sm2Fe17Nx (0 < x < 3) phase had an average hyperfine field of ~24 T, considerably smaller than that of the 'fully nitride' Sm2Fe17N3 phase of ~33 T [20]. The difference between the hyperfine field parameters of the Mössbauer spectra of the samples with carbon additives of both modifications did not exceed statistical error.…”

“…However, Sm 2 Fe 17 N x powder production includes the nitrogenation process of Sm 2 Fe 17 , which lasts for dozens of hours [20]. This time-consuming step can be excluded by replacing nitrogen with carbon, as similar structural effects were observed in Sm 2 Fe 17 C x [21][22][23][24][25].…”