Tb3CoGaS7 crystallizes in the hexagonal P6_3 space group. Tb(1) is bonded in a 7-coordinate geometry to one S(3), three equivalent S(1), and three equivalent S(2) atoms. Co(1) is bonded to six equivalent S(1) atoms to form face-sharing CoS6 octahedra. Ga(1) is bonded in a tetrahedral geometry to one S(3) and three equivalent S(2) atoms. There are three inequivalent S sites. In the first S site, S(1) is bonded to three equivalent Tb(1) and two equivalent Co(1) atoms to form STb3Co2 square pyramids that share corners with two equivalent S(1)Tb3Co2 square pyramids, corners with three equivalent S(3)Tb3Ga tetrahedra, edges with four equivalent S(1)Tb3Co2 square pyramids, and faces with two equivalent S(1)Tb3Co2 square pyramids. In the second S site, S(2) is bonded in a rectangular see-saw-like geometry to three equivalent Tb(1) and one Ga(1) atom. In the third S site, S(3) is bonded to three equivalent Tb(1) and one Ga(1) atom to form corner-sharing STb3Ga tetrahedra.
Tb3CoGaS7 crystallizes in the hexagonal P6_3 space group. Tb(1) is bonded in a 7-coordinate geometry to one S(3), three equivalent S(1), and three equivalent S(2) atoms. The Tb(1)-S(3) bond length is 2.76 Å. There are a spread of Tb(1)-S(1) bond distances ranging from 2.74-2.83 Å. There are a spread of Tb(1)-S(2) bond distances ranging from 2.80-2.98 Å. Co(1) is bonded to six equivalent S(1) atoms to form face-sharing CoS6 octahedra. There are three shorter (2.38 Å) and three longer (2.44 Å) Co(1)-S(1) bond lengths. Ga(1) is bonded in a tetrahedral geometry to one S(3) and three equivalent S(2) atoms. The Ga(1)-S(3) bond length is 2.25 Å. All Ga(1)-S(2) bond lengths are 2.28 Å. There are three inequivalent S sites. In the first S site, S(1) is bonded to three equivalent Tb(1) and two equivalent Co(1) atoms to form STb3Co2 square pyramids that share corners with two equivalent S(1)Tb3Co2 square pyramids, corners with three equivalent S(3)Tb3Ga tetrahedra, edges with four equivalent S(1)Tb3Co2 square pyramids, and faces with two equivalent S(1)Tb3Co2 square pyramids. In the second S site, S(2) is bonded in a rectangular see-saw-like geometry to three equivalent Tb(1) and one Ga(1) atom. In the third S site, S(3) is bonded to three equivalent Tb(1) and one Ga(1) atom to form corner-sharing STb3Ga tetrahedra.