Abstract
Magnetic after-effect measurements of Sm2Fe14Ga3 and the carbide Sm2Fe14Ga3C were performed in the temperature range of 140 to 450 K. In the case of Sm2Fe14Ga3C, the relaxation spectrum is composed of two characteristic maxima at 220 and 320 K. The latter maximum is not present in Sm2Fe14Ga3 and therefore assigned to local jumps of interstitially dissolved carbon atoms while the former is attributed to hydrogen. Numerical evaluation yielded an activation enthalpy of (0.96 ± 0.02) eV and a pre-exponential factor τ0=3×10−14±0.5 s for the short-range diffusion of C atoms. The corresponding values for the short-range diffusion of hydrogen are (0.64±0.04) eV and τ0=3×10−14±1 s.
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