SrEuSe2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Sr(1) is bonded to six equivalent Se(1) atoms to form SrSe6 octahedra that share corners with six equivalent Eu(1)Se6 octahedra, edges with six equivalent Sr(1)Se6 octahedra, and edges with six equivalent Eu(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 1°. Eu(1) is bonded to six equivalent Se(1) atoms to form EuSe6 octahedra that share corners with six equivalent Sr(1)Se6 octahedra, edges with six equivalent Sr(1)Se6 octahedra, and edges with six equivalent Eu(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 1°. Se(1) is bonded to three equivalent Sr(1) and three equivalent Eu(1) atoms to form a mixture of corner and edge-sharing SeSr3Eu3 octahedra. The corner-sharing octahedra are not tilted.
SrEuSe2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Sr(1) is bonded to six equivalent Se(1) atoms to form SrSe6 octahedra that share corners with six equivalent Eu(1)Se6 octahedra, edges with six equivalent Sr(1)Se6 octahedra, and edges with six equivalent Eu(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 1°. All Sr(1)-Se(1) bond lengths are 3.13 Å. Eu(1) is bonded to six equivalent Se(1) atoms to form EuSe6 octahedra that share corners with six equivalent Sr(1)Se6 octahedra, edges with six equivalent Sr(1)Se6 octahedra, and edges with six equivalent Eu(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 1°. All Eu(1)-Se(1) bond lengths are 3.09 Å. Se(1) is bonded to three equivalent Sr(1) and three equivalent Eu(1) atoms to form a mixture of corner and edge-sharing SeSr3Eu3 octahedra. The corner-sharing octahedra are not tilted.