The influence of oxygen content on the Tc of HTS Hg-1245

We have observed an extraordinary behavior oh the Hg Ba2Ca4 Cu5 O12+δ layered HTS (phase 1245) in the over doped state. Earlier we have synthesized the phase Hg-1245 with different oxygen content and consequently different values of the lattice parameter a. We have observed a coincidence of a values when the Tc(a) cupolas reach their maxima for phases Hg-1223, 1234, 1245 and a merging of their over doped parts together with abrupt falling off of the Tc values. The Hg-1245 phase has shown the most unusual behavior. Contrary to other phases, this one contains three types of Cu O2 layers in a unit cell. We supposed that, in the case of the Hg-1245 phase, the holes coming from the reservoir, which is the Hg-O plane, cannot reach the 'far' Cu O2 layer which is notable for this phase. We have calculated the hole concentration for each layer for 1223, 1234 and 1245 phases. The hole concentration appears negligibly small for the over doped 1245 phase. We can consider the 'fifth' Cu O2 layer as not taking part in superconductivity. The analysis of the behavior of the Tc(a) cupolas for the phases with different number of Cu O2 layers and of hole density distribution between the layers has been carried out