SmCeO2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Sm(1) is bonded to six equivalent O(1) atoms to form SmO6 octahedra that share corners with six equivalent Ce(1)O6 octahedra, edges with six equivalent Sm(1)O6 octahedra, and edges with six equivalent Ce(1)O6 octahedra. The corner-sharing octahedral tilt angles are 1°. Ce(1) is bonded to six equivalent O(1) atoms to form CeO6 octahedra that share corners with six equivalent Sm(1)O6 octahedra, edges with six equivalent Sm(1)O6 octahedra, and edges with six equivalent Ce(1)O6 octahedra. The corner-sharing octahedral tilt angles are 1°. O(1) is bonded to three equivalent Sm(1) and three equivalent Ce(1) atoms to form a mixture of corner and edge-sharing OCe3Sm3 octahedra. The corner-sharing octahedra are not tilted.
SmCeO2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Sm(1) is bonded to six equivalent O(1) atoms to form SmO6 octahedra that share corners with six equivalent Ce(1)O6 octahedra, edges with six equivalent Sm(1)O6 octahedra, and edges with six equivalent Ce(1)O6 octahedra. The corner-sharing octahedral tilt angles are 1°. All Sm(1)-O(1) bond lengths are 2.46 Å. Ce(1) is bonded to six equivalent O(1) atoms to form CeO6 octahedra that share corners with six equivalent Sm(1)O6 octahedra, edges with six equivalent Sm(1)O6 octahedra, and edges with six equivalent Ce(1)O6 octahedra. The corner-sharing octahedral tilt angles are 1°. All Ce(1)-O(1) bond lengths are 2.51 Å. O(1) is bonded to three equivalent Sm(1) and three equivalent Ce(1) atoms to form a mixture of corner and edge-sharing OCe3Sm3 octahedra. The corner-sharing octahedra are not tilted.