[en] Single crystals of 2212-type compounds were grown and investigated by X-ray diffraction (XRD) and electron microprobe analysis (EMPA). Several isostructural Bi-2212-type phases were indicated, which differed in chemical composition, lattice parameters and physical properties. Several sequences of solid solutions have been distinguished which differ in the Pb amount in the crystals. In each sequence the lattice constant c changes successively depending on the concentration of Y or rare earth (RE) substituting for Ca. However, in each sequence only several single-phase samples with particular compositions were found. The compounds with intermediate compositions, and hence with intermediate Y, RE concentrations, represent an epitaxial intergrowth on the stable phases or manifest themselves as inclusions at decomposition of solid solutions at melt quenching. The cation sublattice was found to be dominant in the structure formation. Determination of the sequences of solid solutions allowed us to propose a decantation method to obtain monophase single crystals. The phase intergrowth scheme was also considered. (author)