摘要: Publisher Summary The assessment of the thermodynamic properties individual phases, such as their Gibbs energy a function temperature, composition, and possibly pressure is basis for successful establishment databank. data have to be made available phases with wide variety properties. This chapter provides an overview models used in energies phases. Once are known, all other can derived. information about formed into physical picture or model, oscillating atoms on lattice sites restricted number degrees freedom describe maximum value heat capacity. To able quantify measured properties, next step put model mathematical form, which subsequently making interpolations even predictions. Before accepting prediction given by it important test comparing predictions experimental already obtained new experiments. Even after passing test, must realized that behind description might not give correct real world. may thus result incorrect outside range has been tested.