Neodymium(III) cathodic processes in molten fluorides

Add time:09/10/2019    Source:sciencedirect.com

The electrochemical behaviour of the Nd(III)/Nd(0) system has been investigated in several molten media and more particularly in LiF–CaF2. A preliminary study based both on thermodynamic and experimental data showed that it is not possible to observe the Nd(III)/Nd(0) system in LiF–KF and LiF–NaF melts; because the K+ and Na+ cation reduction waves hide the Nd3+ reduction wave. Then, the Nd(III)/Nd(0) system has been investigated at 810 °C using solutions of NdF3 in fluoride solvents without K+ and Na+ ions, such as LiF–CaF2, by cyclic voltammetry, chronopotentiometry and square wave voltammetry. Experimental results show that neodymium trifluoride is reduced in Nd(0) in a one-step process exchanging three electrons (Nd(III) + 3e− → Nd(0)). The electrode process is shown to be diffusion controlled. Nd(III) diffusion coefficient is in the range of 1.1–1.3 × 10−5 cm2 s−1 at 810 °C.

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