Chronopotentiometry of chromate in molten LiCI-KCI eutectic revealed a single, irreversible, diffusioncontrolled, three-electron reduction step. The diffusion coefficient of chromate ion at 450° is estimated to be 1.7 x 10-6 cm2 sec-1. Current-reversal chronopotentiometry revealed abnormally short reverse transition times, which decreased markedly with rising temperature, but increased somewhat in the presence of added oxide ion. It is concluded that the primary reduction product is the ion Cr04+, which decomposes to yield Cr03-3 and O-2. At a sufficiently high surface Concentration of CrO4-5, solid Li,Cr04 is deposited.In the presence of MgClz or CaCI,, the reduction potential is shifted 0.8 and 0.6 volt, respectively, in the positive direction.Extraordinarily stable deposits are produced. No reverse electrochemical oxidation of these deposits occurs.
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