Kinetic and Thermodynamic Properties of Samarium Chlorides Dissolved in Alkali Chloride Melts Obtained by Electrochemical Transient Techniques

Abstract

The electrochemical behavior of samarium in NaCl-KCl, KCl, and CsCl melts was studied in the temperature range 973-1173 K by different electrochemical methods. The diffusion coefficients (D) of Sm(III) and Sm(II) were determined by linear sweep voltammetry, chronopotentiometry, and chronoamperometry methods. The standard rate constants of charge transfer (k s) for the Sm(III)/Sm(II) redox couple were calculated on the basis of cyclic voltammetry data using Nicholson’s equation. The nature of working electrode on the standard rate constants of charge transfer for the Sm(III)/Sm(II) redox couple was studied. The formal redox potentials E* Sm(III)/Sm(II) were obtained in alkali chlorides melts from the cyclic voltammetry data.