Application of the Redlich-Kister expansion for estimating the density of molten fluoride psuedo-ternary salt systems of nuclear industry interest

•Several molten fluoride pseudo-ternary salt system densities were estimated.•The estimation is based on Redlich-Kister expansion and Muggianu interpolation.•This method generally outperforms estimation by additive molar volumes.•Some unmeasured pseudo-binary system densities were also estimated.