Abstract
The electrolytic reduction of K 2TiF 6 to trivalent titanium, which has been studied in the molten LiFKF and LiFNaFKF eutectic mixtures in the 500–800°C temperature range by means of semi-integral voltammetry and chronopotentiometry, is shown to proceed reversibly. The diffusion coefficients of TiF 2− 6 species have been determined to be 2.7 × 10 −3 exp (−4458/ T)cm 2S −1. Some kinetic complications to this reversible behaviour can occur due to the precipitation of K 2NaTiF 6 and K 3TiF 6 crystals and to the electrode surface stae at the start of the polarization. Tetravalent titanium, as well as anodizing, produce oxidized layers at the electrode surface which induce the appearance of a catalytic mechanism involving the regeneration of tetravalent titanium ions.
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