Abstract
Palladium specimens loaded with hydrogen(H) or deuterium(D) by an electrolytic method were quenched to 4.2 K to study the precipitation process. In the subsequent isochronal annealing experiments, the resistivity increase due to the quenched H was found to decrease between 80 and 150 K. This decrease shows that the H migrates and precipitates at these temperatures. Almost the same results were obtained for D. The onset of the H migration at a relatively high temperature of 80 K as well as the small isotope effect reveal that the mechanism of H diffusion in palladium is nearly classical.The temperature of the recovery stage was measured as a function of hydrogen concentration and was found to shift to lower temperatures with increasing concentration.The result was interpreted as the concentration dependence of a nucleation process.The resistivity increase due to disolved H was measured as a function of the electrolytic charging time and the current density during the specimen preparation. Analysis of the result reveals that about 28% of H ions produced on the specimen surface are absorbed into the bulk. This result might be useful to estimate the time or current density to load H isotopes into Pd to a high concentration as frequently being done in recent fusion research.
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