The article presents a model and derives analytical expressions for Helmholtz free energy, the nearest neighbor distance, isothermal compressibility, the thermal expansion coefficient, the heat capacities at constant volume and constant pressure as functions of temperature, concentration of interstitial atoms, and film’s thickness for an interstitial binary alloy with a BCC structure based on the statistical moment method (SMM).

Thermophysical properties of industrially complex fluids whose composition is always ill-defined are in practice predicted by using thermodynamic models. To ensure the prediction accurately and reliably, a three-step procedure to obtain the properties of these fluids must be validated. The focus of this study is laid on a short review of tools which can be served for each of the three steps.