The ternary system SrO-CeO2-TiO2 was investigated using X-ray diffractometry. The formation of a new compound, Sr2Ce2Ti5O16, was established, and its compatibilities with SrO, SrCeO3, and SrTiO3 were studied. The results revealed the existence of a series of compounds Sr6-12xCe6xTi5O16 and solid solutions Sr2+nCe2Ti5+nO16+3n (n less-than-or-equal-to 6).