  The phase diagram of the system LiF-LuF3 has been revised using thermal
analysis. Specific heat capacity and enthalpy of phase transition and fusion
were measured by differential scanning calorimetry for all compounds belonging
to the system. A thermodynamic optimization of the LiF-LuF3 phase diagram was
performed by fitting the Gibbs energy functions to experimental data that were
taken from the literature or measured in this work. Excess energy terms, which
describe the effect of interaction between the two fluoride compounds in the
liquid solution, were expressed by the Redlich-Kister polynomial function. The
theoretical phase diagram assessed was in suitable agreement with the
re-evaluated experimental data.
