周期的圧力変動によるα鉄中の水素同位体透過の測定

抄録

The permeation response of hydrogen and deuterium through α-iron in the oscillating pressure condition was measured to determine the diffusion coefficient without influence of surface effects.
The diffusion coefficients of hydrogen and deuterium in α-iron at temperatures from 500 to 1000 K are:
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The ratio of the diffusion coefficients of hydrogen isotopes (D_H⁄D_D) depends on the temperature; the value of the ratio approaches to unity with increasing temperature. This behavior differs from that of fcc metals in which the value of the ratio approaches to \sqrt2 with increasing temperature. The isotope effect of hydrogen diffusivity in α-iron can not be explained by the classical rate theory, and the quantum-mechanical correction for it is needed.