Emf measurements were made across the lithium-rich half of the lithiumaluminum system at temperatures from 390 ~ to 550~ using a cell of the type Li/LiC1-KC1 (or LiF-LiC1-LiBr)/Li-A1. The lithium activity increases from 0.007 to approximately 0.7 over the composition range of 48-56 atomic percent (a/o) lithium (the E-phase region). A compound, Li3A12, rather than Li2A1, as reported in standard compilations, exists at temperatures up to the peritectic decomposition at 520r and forms a two-phase region of high lithium activity (>0.85) with the lithium-rich liquid phase. This compound has an estimated free energy of formation of --58 kJ/mole at 700~ The emf data indicate that the lithium-rich liquidus is about 2 a/o richer in lithium than the composition shown in standard compilations of binary phase diagrams.

The electrochemical reduction of U(III) to uranium metal in molten normalLiCl‐normalNaCl‐CaCl2‐BaCl2 electrolyte was investigated, using cyclic voltammetry. The reaction is reversible and controlled by diffusion mass transfer, both at low‐carbon steel and molybdenum electrodes. The rate increased with UCl3 concentration up to about 3.4 mole percent and with temperature over the range of 435°–528°C. Standard potentials ranged from −1.07 to −1.50V vs. normalAg/normalAgCl ; the U(III) diffusion coefficients were between 0.5 normaland 5.0×10−6 cm2/normals .

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