  Three-parametric Lenard-Jones and Morse interatomic potentials are the
simplest ones, which that can be used to obtain thermophysical properties of
the liquid and solid substances. Upon adjusting the model parameters to real
substance properties, the interatomic potentials can be used to describe simple
mono-component substance with good accuracy. Usually, these tree parameters can
be found from the cohesion energy, bulk moduli and the molar volume data or the
lattice parameters, obtained experimentally for pure chemically crystalline
materials. In our paper, in case of chemically different atoms, for both the
Lenard-Jones potential type and the Morse ones, or any other three-parametric
potential type, we propose some convenient model relationships expressing the
corresponding three parameters through the previously found ones for pure
chemical elements.
