BaTbAgS3 crystallizes in the monoclinic C2/m space group. Ba(1) is bonded in a 7-coordinate geometry to two equivalent S(1), two equivalent S(3), and three equivalent S(2) atoms. Tb(1) is bonded to one S(4), two equivalent S(2), and three equivalent S(1) atoms to form TbS6 octahedra that share  a cornercorner with one Tb(1)S6 octahedra, corners with two equivalent Ag(1)S4 trigonal pyramids, edges with four equivalent Tb(1)S6 octahedra, and edges with two equivalent Ag(1)S4 trigonal pyramids. The corner-sharing octahedra are not tilted. Ag(1) is bonded to one S(2), one S(3), and two equivalent S(4) atoms to form distorted AgS4 trigonal pyramids that share corners with two equivalent Tb(1)S6 octahedra, corners with five equivalent Ag(1)S4 trigonal pyramids, edges with two equivalent Tb(1)S6 octahedra, and  an edgeedge with one Ag(1)S4 trigonal pyramid. The corner-sharing octahedral tilt angles are 83°. There are four inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Ba(1) and three equivalent Tb(1) atoms to form distorted SBa2Tb3 square pyramids that share corners with two equivalent S(3)Ba4Ag2 octahedra, corners with three equivalent S(4)Tb2Ag4 octahedra, corners with four equivalent S(2)Ba3Tb2Ag octahedra,  an edgeedge with one S(3)Ba4Ag2 octahedra, edges with four equivalent S(2)Ba3Tb2Ag octahedra, and edges with four equivalent S(1)Ba2Tb3 square pyramids. The corner-sharing octahedral tilt angles range from 6-87°. In the second S site, S(2) is bonded to three equivalent Ba(1), two equivalent Tb(1), and one Ag(1) atom to form distorted SBa3Tb2Ag octahedra that share corners with four equivalent S(3)Ba4Ag2 octahedra, corners with four equivalent S(1)Ba2Tb3 square pyramids, edges with two equivalent S(4)Tb2Ag4 octahedra, edges with four equivalent S(2)Ba3Tb2Ag octahedra, edges with four equivalent S(1)Ba2Tb3 square pyramids, and  a faceface with one S(3)Ba4Ag2 octahedra. The corner-sharing octahedral tilt angles range from 42-56°. In the third S site, S(3) is bonded to four equivalent Ba(1) and two equivalent Ag(1) atoms to form SBa4Ag2 octahedra that share corners with four equivalent S(4)Tb2Ag4 octahedra, corners with eight equivalent S(2)Ba3Tb2Ag octahedra, corners with four equivalent S(1)Ba2Tb3 square pyramids, edges with two equivalent S(3)Ba4Ag2 octahedra, edges with two equivalent S(1)Ba2Tb3 square pyramids, and faces with two equivalent S(2)Ba3Tb2Ag octahedra. The corner-sharing octahedral tilt angles range from 42-56°. In the fourth S site, S(4) is bonded to two equivalent Tb(1) and four equivalent Ag(1) atoms to form STb2Ag4 octahedra that share corners with four equivalent S(3)Ba4Ag2 octahedra, corners with six equivalent S(1)Ba2Tb3 square pyramids, edges with two equivalent S(4)Tb2Ag4 octahedra, and edges with four equivalent S(2)Ba3Tb2Ag octahedra. The corner-sharing octahedral tilt angles are 51°.
BaTbAgS3 crystallizes in the monoclinic C2/m space group. Ba(1) is bonded in a 7-coordinate geometry to two equivalent S(1), two equivalent S(3), and three equivalent S(2) atoms. Both Ba(1)-S(1) bond lengths are 3.25 Å. Both Ba(1)-S(3) bond lengths are 3.10 Å. All Ba(1)-S(2) bond lengths are 3.28 Å. Tb(1) is bonded to one S(4), two equivalent S(2), and three equivalent S(1) atoms to form TbS6 octahedra that share  a cornercorner with one Tb(1)S6 octahedra, corners with two equivalent Ag(1)S4 trigonal pyramids, edges with four equivalent Tb(1)S6 octahedra, and edges with two equivalent Ag(1)S4 trigonal pyramids. The corner-sharing octahedra are not tilted. The Tb(1)-S(4) bond length is 2.83 Å. Both Tb(1)-S(2) bond lengths are 2.77 Å. There are two shorter (2.78 Å) and one longer (2.79 Å) Tb(1)-S(1) bond length. Ag(1) is bonded to one S(2), one S(3), and two equivalent S(4) atoms to form distorted AgS4 trigonal pyramids that share corners with two equivalent Tb(1)S6 octahedra, corners with five equivalent Ag(1)S4 trigonal pyramids, edges with two equivalent Tb(1)S6 octahedra, and  an edgeedge with one Ag(1)S4 trigonal pyramid. The corner-sharing octahedral tilt angles are 83°. The Ag(1)-S(2) bond length is 2.76 Å. The Ag(1)-S(3) bond length is 2.60 Å. Both Ag(1)-S(4) bond lengths are 2.70 Å. There are four inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Ba(1) and three equivalent Tb(1) atoms to form distorted SBa2Tb3 square pyramids that share corners with two equivalent S(3)Ba4Ag2 octahedra, corners with three equivalent S(4)Tb2Ag4 octahedra, corners with four equivalent S(2)Ba3Tb2Ag octahedra,  an edgeedge with one S(3)Ba4Ag2 octahedra, edges with four equivalent S(2)Ba3Tb2Ag octahedra, and edges with four equivalent S(1)Ba2Tb3 square pyramids. The corner-sharing octahedral tilt angles range from 6-87°. In the second S site, S(2) is bonded to three equivalent Ba(1), two equivalent Tb(1), and one Ag(1) atom to form distorted SBa3Tb2Ag octahedra that share corners with four equivalent S(3)Ba4Ag2 octahedra, corners with four equivalent S(1)Ba2Tb3 square pyramids, edges with two equivalent S(4)Tb2Ag4 octahedra, edges with four equivalent S(2)Ba3Tb2Ag octahedra, edges with four equivalent S(1)Ba2Tb3 square pyramids, and  a faceface with one S(3)Ba4Ag2 octahedra. The corner-sharing octahedral tilt angles range from 42-56°. In the third S site, S(3) is bonded to four equivalent Ba(1) and two equivalent Ag(1) atoms to form SBa4Ag2 octahedra that share corners with four equivalent S(4)Tb2Ag4 octahedra, corners with eight equivalent S(2)Ba3Tb2Ag octahedra, corners with four equivalent S(1)Ba2Tb3 square pyramids, edges with two equivalent S(3)Ba4Ag2 octahedra, edges with two equivalent S(1)Ba2Tb3 square pyramids, and faces with two equivalent S(2)Ba3Tb2Ag octahedra. The corner-sharing octahedral tilt angles range from 42-56°. In the fourth S site, S(4) is bonded to two equivalent Tb(1) and four equivalent Ag(1) atoms to form STb2Ag4 octahedra that share corners with four equivalent S(3)Ba4Ag2 octahedra, corners with six equivalent S(1)Ba2Tb3 square pyramids, edges with two equivalent S(4)Tb2Ag4 octahedra, and edges with four equivalent S(2)Ba3Tb2Ag octahedra. The corner-sharing octahedral tilt angles are 51°.