Chronopotentiometry of chromate in the presence of NiCl2 in molten LiCl-KCl eutectic reveals a diffusion controlled, three electron reduction step. In the presence of excess NiCl2, chromate is reduced at −0.35V vs. Pt(II)/Pt reference electrode and the electroactive species responsible for the chrono-potentiometric wave is estimated to have a diffusion coefficient of 1.06 · 10−5 cm2 sec−1 at 450°C. The stoichiometry of the reduction product depends mainly on the temperature at which the deposit is formed. At 500°C the deposit approaches the composition LiNi2CrO4. X-ray powder diffraction shows the deposit to be a single compound with a face centered cubic lattice. The length of the unit cell edge is estimated to be 4.14Å. At 1400°C a weight loss of the deposit is observed. X-ray powder diffraction shows the presence of two phases, which are identified as NiO and NiCr2O4 The weight loss is attributed to volatization of Li2O.
Journal of the Electrochemical Society, 1970, pages 482-484.
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