Two features of hypothetical Plasma Phase Transitions (PPT) in H₂/He mixture in interiors of Giant Planets and Brawn Dwarfs are under discussion: (A) Non-congruence of this PPT in H₂/He mixture (phase decomposition into two phases with differing stoichiometries); (B) Electrostatic potential of phase boundaries in Coulomb systems. Both effects are estimated for well-known example of PPT in H₂ (Saumon, Chabrier, Van Horn (SCVH-95)) in its application to H₂/He mixture of GP and BD. Non-congruence of this PPT proved to be noticeable (Y'<=>Y" ∼ 0.22-0.31 in He mass abundance). "Molecular" phase proved to be depleted, and "plasma" phase - enriched by helium. Thus, hypothetical connection of this non-congruency of PPT with observed helium depletion of GP's atmospheres may be discussed.

Electrostatic potential drop at solid-liquid interface for melting of Wigner crystal was calculated and estimated in three regimes: classical melting (Gamma=175); "Cold" quantum melting (r_s ∼ 100) and intermediate zone. Electrostatic diagram of Wigner crystal is discussed. Estimations of electrostatic potential of mean-phase boundary in the SCVH-95 PPT-version and for phase decomposition in Binary Ionic Mixture (BIM) are under discussion.

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