LiErSe2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Li(1) is bonded to six equivalent Se(1) atoms to form LiSe6 octahedra that share corners with six equivalent Er(1)Se6 octahedra, edges with six equivalent Li(1)Se6 octahedra, and edges with six equivalent Er(1)Se6 octahedra. The corner-sharing octahedra are not tilted. Er(1) is bonded to six equivalent Se(1) atoms to form ErSe6 octahedra that share corners with six equivalent Li(1)Se6 octahedra, edges with six equivalent Li(1)Se6 octahedra, and edges with six equivalent Er(1)Se6 octahedra. The corner-sharing octahedra are not tilted. Se(1) is bonded to three equivalent Li(1) and three equivalent Er(1) atoms to form a mixture of corner and edge-sharing SeLi3Er3 octahedra. The corner-sharing octahedra are not tilted.
LiErSe2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Li(1) is bonded to six equivalent Se(1) atoms to form LiSe6 octahedra that share corners with six equivalent Er(1)Se6 octahedra, edges with six equivalent Li(1)Se6 octahedra, and edges with six equivalent Er(1)Se6 octahedra. The corner-sharing octahedra are not tilted. All Li(1)-Se(1) bond lengths are 2.82 Å. Er(1) is bonded to six equivalent Se(1) atoms to form ErSe6 octahedra that share corners with six equivalent Li(1)Se6 octahedra, edges with six equivalent Li(1)Se6 octahedra, and edges with six equivalent Er(1)Se6 octahedra. The corner-sharing octahedra are not tilted. All Er(1)-Se(1) bond lengths are 2.83 Å. Se(1) is bonded to three equivalent Li(1) and three equivalent Er(1) atoms to form a mixture of corner and edge-sharing SeLi3Er3 octahedra. The corner-sharing octahedra are not tilted.