Calphad (Calculation of phase diagrams) is a widely accepted general method to calculate phase diagrams for macroscopic phases. The increasing role of nanotechnology requires a generally valid method to extend the Calphad method to a nano-Calphad method. The latter should be able to calculate phase equilibria, when at leat one length of at least one phase in a system is smaller than 100 nm. In this case the Gibbs energy of the system becomes dependent on the interfacial energies bewtween the phases. That is why, HTC (high-temperature capillarity) is the community / conference, which should take a leading role in converting the existing Calphad concept into a borning concept of nano-Calphad.
The present talk will summarize the problems to create the nano-Calphad concept and will answer some of the questions.