Correlation between T-c and crystal chemical parameters of cation sublattice A(n+1)(Cu)(n) in perovskite layer of high-T-c cuprate superconductors

It was found the empirical dependence of T-c of high-temperature supercondu cting cuprates (HTSC) from the ratio (J) of such parameters as the distance s between Cu atoms in CuO2 plane and the distances from CuO2 plane to adjac ent ones of A cations (A - Ca, Sr, Ba, Y, La, and so on), also from the siz e and charge of A cations and doping atoms with effect on T-c is proved exp erimentally. All HTSC phases are divided only on two groups with an intrins ic dependence T-c(J): the phases formed by single CuO2 plane and by several CuO2 planes, The closer approximation of that dependence gives the equatio n of polynomial of third degree.