Abstract
The depression of the freezing point of lithium (previously gettered with yttrium at 400°C) caused by deuterium has been determined by thermal analysis. The freezing point drops from 180.490 to 180.415° C at the eutectic composition, 0.013 mol% D. These values are marginally smaller than for hydrogen (depression 0.082 °C at 0.016 mol% H). The solubility of deuterium in the liquid metal has been determined up to 2.63 mol% D by electrical resistance methods and can be represented by the equation log 10 x d = 2.321−2873/ T 549≤ T≤ 724 K, where x D is the mole fraction of D. The solubility provides values of the partial molar enthalpy, H ( soln) and entropy, S ( soln) (with respect to the precipitating phase) of solution of deuterium of 54.8 kJ mol − and 44.2 J K −1 mol −1, respectively. The value of H ( soln) is used to derive a solvation enthalpy of −417 kJ mol −1 for the deuteride ion thereby indicating weaker solvation than for the hydride ion.
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