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The incorporation of radioactive elements in fission products (FPs) into complex oxides, where the elements are constrained in the structure and enhanced leaching and radioactive stability can be obtained, is an active research area in the nuclear fuel cycle. Perovskite structured Sr₂Fe_1.5Mo_0.5O_6−δ (SFM) has the capability of incorporating several FPs (such as Sr and Mo) into the crystalline network simultaneously while maintaining a stabilized structure. The radiation damage effects on the structure changes of this polycrystalline SFM sample is conducted under various ion irradiations including 200 keV He ions to a fluence of 5 × 10²⁰ ions m⁻², 100 keV H to a fluence of 3 × 10²¹ ions cm⁻², and 600 keV Kr ions to a fluence of 2.5 × 10¹⁹ ions m⁻² at room temperature. Irradiation-induced structural evolution was examined by using grazing incidence X-ray diffraction and cross-sectional transmission electron …