Fernández Tejero, CarlosDaanoun, A.Lekkerkerker, H. N. W.Baus, M.2023-06-202023-06-201995-011539-375510.1103/PhysRevE.51.558https://hdl.handle.net/20.500.14352/58883© 1995 The American Physical Society. C. F. Tejero acknowledges the DGICYT (Spain) (PB91-0378) and M. Baus the FNRS (Belgium) and the Association Euratom—Etat Belge.A variational approach based on the Gibbs-Bogoliubov inequality is used in order to evaluate the free energy of simple fuids described by a double-Yukawa pair potential. A hard-sphere reference fuid is used to describe the fuid phases, and an Einstein reference crystal to describe the solid phases. A part from the usual type of phase diagram, typical of atomic simple fuids with long-ranged attractions, we find two types of phase diagrams, specific to colloidal systems with intermediate and short-ranged attractions. One of the latter phase diagrams exhibits an isostructural solid-solid transition, which has not yet been observed experimentallyengjournal articlehttp://dx.doi.org/10.1103/PhysRevE.51.558http://pre.aps.org/restricted access536Yukawa ModelFree-EnergySuspensionsFCCPhasesTermodinámica2213 Termodinámica