Calculation of the Phase Diagrams (T – X and T – P) and the Thermodynamic Quantities for the Solid – Liquid Equilibria in n-tridecane

The solid – liquid equilibria in n-tridecane is investigated by calculating phase diagrams and the thermodynamic quantities using Landau phenomenological model. By expanding free energy terms of order parameter phase, line equations are fitted to experimental data for T X P from literature. temperature dependences (order ψ, susceptibility χ_ψ, F, heat capacity C, entropy S enthalpy H) predicted this Our results give that slope dT⁄dP≅2 "K/MPa" n-C13 n-C17. ψ varies with as ψ~(T-T_m )^(1⁄2) above T_m. It linear 〖χ_ψ〗^(-1), S(T) C(T), quadratic F(T) H(T) n-tridecane. This indicates model, describes observed behaviour satisfactorily Predictions can also be compared measurements predictions some other theoretical models. pressure effect, particular, on under model studied here.