Plasma model of crystals based on potassium dihydrogen phosphate

Within electron plasma model, complex crystals of ABCD, KH2PO4 as a result of phase separation into four subsystems: are considered. During the phase transition in crystals, the valence bond breaking associated with the crystal lattice destruction. It is caused by the balance energies of the Aa-Bb-Cc-Dd and A-A, B-B, C-C, D-D bonds. The basic principle of the phase transition is caused by bonds being broken and dumbbell configurations of atoms are formed. The pairing of electrons is guided by a plasma mechanism. Free electrons couple to lower system energy. When molecules are formed from individual atoms by dumbbell configuration, energy is released. The energy balance is caused by a change in the distances between atoms A-A, B-B, C-C, D-D, with decreasing temperature. It is necessary that in the phase transition region the total square plasma energy of the formed quasi-molecules is significantly greater than the square plasma energy of the original crystal. This is the condition for the phase transition in the crystals.