CaEuS2 is Caswellsilverite-like structured and crystallizes in the tetragonal P4/mmm space group. Ca(1) is bonded to two equivalent S(1) and four equivalent S(2) atoms to form CaS6 octahedra that share corners with six equivalent Ca(1)S6 octahedra, edges with four equivalent Ca(1)S6 octahedra, and edges with eight equivalent Eu(1)S6 octahedra. The corner-sharing octahedra are not tilted. Eu(1) is bonded to two equivalent S(2) and four equivalent S(1) atoms to form EuS6 octahedra that share corners with six equivalent Eu(1)S6 octahedra, edges with four equivalent Eu(1)S6 octahedra, and edges with eight equivalent Ca(1)S6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Ca(1) and four equivalent Eu(1) atoms to form SCa2Eu4 octahedra that share corners with six equivalent S(1)Ca2Eu4 octahedra, edges with four equivalent S(1)Ca2Eu4 octahedra, and edges with eight equivalent S(2)Ca4Eu2 octahedra. The corner-sharing octahedra are not tilted. In the second S site, S(2) is bonded to four equivalent Ca(1) and two equivalent Eu(1) atoms to form SCa4Eu2 octahedra that share corners with six equivalent S(2)Ca4Eu2 octahedra, edges with four equivalent S(2)Ca4Eu2 octahedra, and edges with eight equivalent S(1)Ca2Eu4 octahedra. The corner-sharing octahedra are not tilted.
CaEuS2 is Caswellsilverite-like structured and crystallizes in the tetragonal P4/mmm space group. Ca(1) is bonded to two equivalent S(1) and four equivalent S(2) atoms to form CaS6 octahedra that share corners with six equivalent Ca(1)S6 octahedra, edges with four equivalent Ca(1)S6 octahedra, and edges with eight equivalent Eu(1)S6 octahedra. The corner-sharing octahedra are not tilted. Both Ca(1)-S(1) bond lengths are 2.91 Å. All Ca(1)-S(2) bond lengths are 2.90 Å. Eu(1) is bonded to two equivalent S(2) and four equivalent S(1) atoms to form EuS6 octahedra that share corners with six equivalent Eu(1)S6 octahedra, edges with four equivalent Eu(1)S6 octahedra, and edges with eight equivalent Ca(1)S6 octahedra. The corner-sharing octahedra are not tilted. Both Eu(1)-S(2) bond lengths are 2.91 Å. All Eu(1)-S(1) bond lengths are 2.90 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Ca(1) and four equivalent Eu(1) atoms to form SCa2Eu4 octahedra that share corners with six equivalent S(1)Ca2Eu4 octahedra, edges with four equivalent S(1)Ca2Eu4 octahedra, and edges with eight equivalent S(2)Ca4Eu2 octahedra. The corner-sharing octahedra are not tilted. In the second S site, S(2) is bonded to four equivalent Ca(1) and two equivalent Eu(1) atoms to form SCa4Eu2 octahedra that share corners with six equivalent S(2)Ca4Eu2 octahedra, edges with four equivalent S(2)Ca4Eu2 octahedra, and edges with eight equivalent S(1)Ca2Eu4 octahedra. The corner-sharing octahedra are not tilted.