Modeling and Calculation of the LiF−NaF−MF3 (M = La, Ce, Pu) Phase Diagrams

• Published in: Chemistry of materials 2006-01, Vol.18 (2), p.510-517
• Main Authors: van der Meer, J. P. M, Konings, R. J. M, Hack, K, Oonk, H. A. J
• Format: Article
• Language: English
• ISSN: 0897-4756; 1520-5002
• DOI: 10.1021/cm051531v

The ternary systems LiF−NaF−LaF3 and LiF−NaF−CeF3 have been experimentally analyzed and thermodynamically assessed. Two models were used and compared to describe the excess Gibbs terms of the binary subsystems. One was a regular polynomial description of the excess terms, the other a quasichemical in the quadruplet approximation. In both cases, a fine agreement with the experimental data was achieved, after asymmetrical extrapolation from the binary to the ternary systems. The binary systems of the related actinide system LiF−NaF−PuF3 were assessed, making use of experimental data known from the literature. The lanthanide systems served as a proxy for LiF−NaF−PuF3 to calculate the ternary phase diagram.