Internal cation mobility in molten LiCl–NdCl3 system

Internal cation mobility in molten CsCl–NdCl3 system at 1073K

“…Molar fractions of CsCl and NdCl 3 in each section of migration capillary had been calculated on the basis of chemical analysis, and their gradients along the migration capillary were determined. More details on experiment may be found in the work [7]. These gradients ('profiles'), i.e.…”

“…Arrangement of the migration quartz cell and details of experiments based on electrolysis of salt melts of required composition have been presented in papers reporting measurements of internal mobility of cations in MCl-LnCl 3 systems (M: Li, Na, K; Ln: La, Nd, Dy) [4][5][6][7][8]. The cell was modified by replacing reduction of gaseous chlorine to chloride ions on graphite electrode with electrodeposition of neodymium.…”

“…NdCl 3 was prepared from Nd 2 O 3 (The Faculty of Chemistry, Maria Curie-Skłodowska University, Lublin, Poland) according to the procedure given previously in papers on migration phenomena in MCl-NdCl 3 systems [5,7,8] or lanthanide chlorides synthesis [10].…”

“…This parameter, a, is characteristic for a given lanthanide and represents the difference between internal mobility of Ln 3+ cations in pure molten LnCl 3 and their mobility in infinitely diluted LnCl 3 in molten alkali metal chloride (extrapolated). The relation has been applied to any experimental data given in the literature on internal mobilities in MCl-LnCl 3 systems [7,9] and to results for CsCl-NdCl 3 system presented in this paper. Calculated dependencies of b Ln on y Ln in corresponding MCl-NdCl 3 systems were related with differential dipole energy (W 12 ), the parameter which involves ionic radii and valencies of ions in the melt (see Eq.…”

“…The observed significant concentration of multivalent cations in the anodic part of the migration cell inspired further, more basic investigations aimed at determining possible correlations between internal mobilities of cations in nonsymmetrical binary molten salt systems of the form MCl-LnCl 3 (M: alkali metal; Ln: rare earth metal) and composition of the melt, temperature and ionic radii of cations. So far, the group of five systems MCl-LnCl 3 (KCl-LnCl 3 (Ln: La [4], Nd [5], Dy [6])) and MCl-NdCl 3 (M: Li [7], Na [8]) was investigated. It was suggested on the basis of results for three KCl-LnCl 3 systems [9] that internal mobility of lanthanide cations is in a simple, one-parameter relation with the mobility of Ln 3+ in pure molten LnCl 3 (b 0 Ln ) and equivalent fraction of LnCl 3 in molten alkali metal chloride (y Ln ) (see Eq.…”