Abstract
Abstract The migration of hydrogen atoms in yttrium (YH 0.05 ) is investigated by electrical resistance measurement around 150 K. The disordered hydrogen atoms are introduced by the quench from 273 K into liquid nitrogen and the hydrogen atoms are ordered by the migration of the atoms during the annealings. The activation energy of hydrogen migration is obtained from the kinetic analysis of the resistance decrease due to the ordering during the isochronal or isothermal annealings. The energy is determined more precisely by the isothermal annealings. The value, 0.481±0.005 eV (46.4±0.5 kJ/mol) is smaller than the high temperature values. The decrease of the value is caused by the tunnel effects of diffusion.
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