Abstract
Magnetic after-effect (MAE) measurements of nitrided and carburized Sm 2Fe 17 compounds were performed in the temperature range of 140 K to 480 K. Both nitrided and carburized compounds show relaxation maxima at 285 and 300 K, respectively, which are absent in pure Sm 2Fe 17 compounds. Therefore, these relaxation maxima are attributed to jumps of interstitially dissolved nitrogen or carbon atoms. Numerical evaluation yielded an activation enthalpy Q N (0.84±0.05) eV and a pre-exponential factor τ 0 N=3·10 −15±1 s for the short-range diffusion of N atoms. The corresponding values for the carbon diffusion are Q C=(0.91±0.05) eV and τ 0 C=1·10 −15±1 s. The carbon and nitrogen content of the samples was determined from the increase in mass during nitrogenation or carburization to Sm 2Fe 17N 1.2 and Sm 2Fe 17C 2.6.
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