Model for the DSC thermograms of the melting of ideal binary solutions

• The goal is to model the DSC thermograms of melting of binaries solid solutions.
• The melting is modeled taking into account the heat conduction inside the DSC cell.
• An enthalpic method is used considering the enthalpies of ideal solutions.
• A parametric study, taking into account the sample heating rates and also the masses of the samples has been done.
• Methods to determine the phase diagram (liquidus and solidus) and the energy of melting are explained.

In this paper, a model is developed in order to determine the melting thermogram of a binary mixture, presenting a solid solution. Considering the case of an ideal solution, whose enthalpy function is analytically derived, we highlight the large differences existing between the thermogram and the derivative of the enthalpy function. The influence of the heating rates and the mass of the sample are analyzed for different concentrations. Finally, in the case of a thermodynamical equilibrium, we describe how to construct the phase diagram of the solution (liquidus and solidus temperatures, total latent heat).