The solubility of deuterium in lithium-lead alloys

The solubility of deuterium in lithium-lead alloys was measured as a function of temperature and atomic fraction of lithium, X_Li. It was found that, at the atom fraction X_Li = 0.78, corresponding to the composition “Li₇Pb₂”, the solubility in the solid phase is lower by a factor of a few hundred than that in the liquid phase. The solubility of deuterium in the Li-Pb system decreases drastically with decreasing X_Li. At about X_{Li = 0.17}, which corresponds to the eutectic “Li₁₇Pb₈₃”, the solubility is independent of temperature. The transition from exothermal to endothermal dissolution occurred at about X_Li ? 0.17.