Abstract
The short-range and long-range diffusion of hydrogen in Dy 2Fe 17 was investigated by magnetic after-effect (MAE) and thermal desorption spectroscopy (TDS) measurements, respectively. After charging the powder samples in a high-purity H 2 atmosphere (15 MPa, 293 K) for 3 days, their hydrogen content was determined by TDS to be Dy 2Fe 17H 0.06. Charged samples show a MAE relaxation maximum at 180 K which is absent in degassed samples and therefore attributed to local hydrogen jumps. Numerical evaluation yielded an activation enthalpy of Q=(0.42±0.02) eV and a pre-exponential factor τ 0=5×10 −12±0.5 s for the short-range diffusion of hydrogen. TDS measurements yielded an activation enthalpy of Q=(0.39±0.02) eV for the long-range diffusion of hydrogen.
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