Study of binary systems NdF3- MF (M = Li, Na, K): experimental, modeling and thermodynamic computation

Abstract

Abstract. The excess molar enthalpies HEm of the binary systems MF-NdF3 (M = Li, Na, K) were measured in the present work by high temperature calorimetry on a wide temperature (1220 K < T < 1400 K) and composition range. Some points of the equilibrium phase diagram have been also obtained by differential thermal analysis. Using the Hoch-Arpshofen model we represent the excess quantities of different systems. This will allow us thereafter to calculate the phase diagrams of binary systems NdF3-MF (M = Li, Na).

Experimental determination and thermodynamic optimization of the LiF-NdF3 system

“…The LiF-LuF 3 molten salt systems (Lu = La, Ce, Pr, Nd, Sm, U and Pu) are all phase diagram systems with a low eutectic point without forming an intermediate, therefore, the thermodynamic LiF-NdF 3 molten salt system can be described by the sub-regular solution model. Moreover, in the literature, [15][16][17] the regular solution model was used to calculate the phase diagram of the LiF-NdF 3 binary system.…”

“…13 The calculated phase diagram is consistent with the experimental phase diagram in literature. 13 M. Berkani et al 15 calculated the LiF-NdF 3 binary phase diagram by thermal analysis and the Hoch–Arpshofen model. A. Abbasalizadeh et al 16 conducted experimental research and thermodynamic modeling on the LiF-NdF 3 -DyF 3 ternary system, as well as Gibbs free energy modeling of the LiF-NdF 3 and LiF-DyF 3 systems by using the literature data.…”

Investigation of the Quasi-Binary Phase Diagram FLiNaK-NdF3

“…Usually, binary or ternary systems of alkali and REM fluorides have been studied [ 20 , 21 , 22 , 23 , 24 ]. Thus, Berkani and Gaune-Escard [ 20 ] performed experiments on the modeling and thermodynamic computation of the binaries NdF 3 -MF (M = Li, Na, K).…”

“…Usually, binary or ternary systems of alkali and REM fluorides have been studied [ 20 , 21 , 22 , 23 , 24 ]. Thus, Berkani and Gaune-Escard [ 20 ] performed experiments on the modeling and thermodynamic computation of the binaries NdF 3 -MF (M = Li, Na, K). The authors [ 21 ] compared the results of the thermodynamic modeling and available experimental data [ 25 ] for the systems LiF-LnF 3 (Ln = La-Sm).…”