Potentiometric study of Sm-O compounds formation in the molten LiCl-KCl eutectic at 450 degrees C. Determination of a E-pO(2-) stability diagram

摘要

Reactions between samarium trichloride and oxide ions were studied in the fused LiCl-KCl eutectic by potentiometric titration, using an yttria-stabilized zirconia electrode. In the experimental conditions used in this work, the titration curves indicate the formation of insoluble samarium oxychloride. Based on these curves, the calculated solubility product is found to be 10(-7.54 +/- 0.17), in molal scale. Characterization of the precipitated compound by X-ray diffraction analysis corroborated the oxychloride formation.