Chemical potential and phase diagrams of hydrogen in palladium

The contribution of hydrogen atoms oscillations in Palladium in pair interaction H–H is calculated. The interpolation formula for an electronic chemical potential of a hydrogen subsystem containing only two energy parameter is obtained. It is shown that the approximation of an mean field for the configuration contribution to a chemical potential with renormalized due to oscillations to energy parameters with allowance for of electronic contribution satisfactorily describes an equilibrium of phases in a system a palladium–hydrogen.