Sm3FeGaS7 crystallizes in the hexagonal P6_3 space group. Sm(1) is bonded in a 7-coordinate geometry to one S(2), three equivalent S(1), and three equivalent S(3) atoms. Fe(1) is bonded to six equivalent S(3) atoms to form face-sharing FeS6 octahedra. Ga(1) is bonded in a tetrahedral geometry to one S(2) and three equivalent S(1) atoms. There are three inequivalent S sites. In the first S site, S(1) is bonded in a rectangular see-saw-like geometry to three equivalent Sm(1) and one Ga(1) atom. In the second S site, S(2) is bonded to three equivalent Sm(1) and one Ga(1) atom to form corner-sharing SSm3Ga tetrahedra. In the third S site, S(3) is bonded to three equivalent Sm(1) and two equivalent Fe(1) atoms to form distorted SSm3Fe2 square pyramids that share corners with two equivalent S(3)Sm3Fe2 square pyramids, corners with three equivalent S(2)Sm3Ga tetrahedra, edges with four equivalent S(3)Sm3Fe2 square pyramids, and faces with two equivalent S(3)Sm3Fe2 square pyramids.
Sm3FeGaS7 crystallizes in the hexagonal P6_3 space group. Sm(1) is bonded in a 7-coordinate geometry to one S(2), three equivalent S(1), and three equivalent S(3) atoms. The Sm(1)-S(2) bond length is 2.83 Å. There are a spread of Sm(1)-S(1) bond distances ranging from 2.83-3.03 Å. There are a spread of Sm(1)-S(3) bond distances ranging from 2.82-2.88 Å. Fe(1) is bonded to six equivalent S(3) atoms to form face-sharing FeS6 octahedra. There are three shorter (2.46 Å) and three longer (2.58 Å) Fe(1)-S(3) bond lengths. Ga(1) is bonded in a tetrahedral geometry to one S(2) and three equivalent S(1) atoms. The Ga(1)-S(2) bond length is 2.25 Å. All Ga(1)-S(1) bond lengths are 2.29 Å. There are three inequivalent S sites. In the first S site, S(1) is bonded in a rectangular see-saw-like geometry to three equivalent Sm(1) and one Ga(1) atom. In the second S site, S(2) is bonded to three equivalent Sm(1) and one Ga(1) atom to form corner-sharing SSm3Ga tetrahedra. In the third S site, S(3) is bonded to three equivalent Sm(1) and two equivalent Fe(1) atoms to form distorted SSm3Fe2 square pyramids that share corners with two equivalent S(3)Sm3Fe2 square pyramids, corners with three equivalent S(2)Sm3Ga tetrahedra, edges with four equivalent S(3)Sm3Fe2 square pyramids, and faces with two equivalent S(3)Sm3Fe2 square pyramids.