Abstract
Abstract The short-range diffusion of hydrogen in RE2Fe17 (RE = Dy, Gd, Y, Nd or Sin) intermetallic compounds was investigated by magnetic after-effect (MAE) measurements. After charging the powder samples in a high-purity H2 atmosphere (0.13 MPa; 473 K) for 2 days, the hydrogen concentrations for DY2Fe17H4.4, Gd2Fe17H3.8, Y2Fe17H3.0, Nd2Fe17H3.5 and Sm2Fe17H5.0 were determined by thermal desorption spectroscopy. Charged samples show several hydrogen-induced MAE relaxation maxima in the temperature range between 80 and 220 K. These relaxation maxima are assigned to jumps of hydrogen atoms between various interstitial sites and discussed with respect to possible diffusion paths. Numerical evaluation yielded activation enthalpies of Q = 0.46, 0.46, 0.49, 0.48 and 0.42eV for Gd2Fe17, Y2Fe17, Nd2Fe17, Sm2Fe17 and Dy2Fe17 respectively, for jumps of hydrogen between octahedral sites which are part of the long-range diffusion paths in these compounds as well.
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