Solid-state chemical reactions in the Bi2O3–SrO–TiO2–Fe2O3 system have afforded layered perovskitetype oxides with the Aurivillius phases structure: (Bi1–х,Srх)m–1Bi2Fem–3Ti3O3m+3–δ (m = 4–7). Special features of their formation and thermal behavior have been studied.