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Hydrogen migration in Pd-H alloys around 50 K anomaly at various hydrogen concentrations

The migration of hydrogen atoms in quenched Pd-H alloys is investigated around 50 K for specimens of various hydrogen concentrations by electrical resistivity measurement. The disordered hydrogen atoms are introduced by quenching from 100 K into liquid helium. The disordered hydrogen atoms order by migration of the atoms during the annealing of the specimens around 50 K. The resistivity increase due to hydrogen ordering largely depends on the hydrogen concentration but the amount is not proportional to the concentration. The activation energy of hydrogen migration is obtained by the cross cut method on the kinetic analysis of the resistivity increase due to the ordering. The obtained value is nearly the same for the hydrogen concentration from PdH0.06 to PdH0.66 though the value increases with the concentration within the experimental error. The energy value is smaller than the high temperature value and this is caused by a tunnelling effect on diffusion.