The structure described by Tb2Sn3(PbS4)3 crystallizes in the orthorhombic Pmc2_1 space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 8-coordinate geometry to one S(4), one S(8), two equivalent S(11), two equivalent S(2), and two equivalent S(3) atoms. In the second Tb site, Tb(2) is bonded to one S(5), one S(6), one S(7), two equivalent S(1), and two equivalent S(10) atoms to form distorted TbS7 pentagonal bipyramids that share corners with two equivalent Sn(2)S6 octahedra, edges with two equivalent Sn(1)S6 octahedra, edges with two equivalent Sn(2)S6 octahedra, and edges with two equivalent Tb(2)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 49°. There are three inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 6-coordinate geometry to one S(4), one S(6), two equivalent S(11), and two equivalent S(9) atoms. In the second Pb site, Pb(2) is bonded in a 7-coordinate geometry to one S(7), two equivalent S(1), two equivalent S(10), and two equivalent S(9) atoms. In the third Pb site, Pb(3) is bonded in a 8-coordinate geometry to one S(5), one S(8), two equivalent S(12), two equivalent S(2), and two equivalent S(3) atoms. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one S(1), one S(2), two equivalent S(4), and two equivalent S(5) atoms to form SnS6 octahedra that share edges with two equivalent Sn(1)S6 octahedra and edges with two equivalent Tb(2)S7 pentagonal bipyramids. In the second Sn site, Sn(2) is bonded to one S(10), one S(9), two equivalent S(6), and two equivalent S(7) atoms to form SnS6 octahedra that share corners with two equivalent Tb(2)S7 pentagonal bipyramids, edges with two equivalent Sn(2)S6 octahedra, and edges with two equivalent Tb(2)S7 pentagonal bipyramids. In the third Sn site, Sn(3) is bonded to one S(11), one S(12), one S(3), and two equivalent S(8) atoms to form corner-sharing SnS5 trigonal bipyramids. There are twelve inequivalent S sites. In the first S site, S(1) is bonded in a 3-coordinate geometry to two equivalent Tb(2), two equivalent Pb(2), and one Sn(1) atom. In the second S site, S(2) is bonded in a 3-coordinate geometry to two equivalent Tb(1), two equivalent Pb(3), and one Sn(1) atom. In the third S site, S(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Tb(1), two equivalent Pb(3), and one Sn(3) atom. In the fourth S site, S(4) is bonded to one Tb(1), one Pb(1), and two equivalent Sn(1) atoms to form distorted STbSn2Pb trigonal pyramids that share corners with two equivalent S(9)SnPb4 square pyramids, corners with two equivalent S(4)TbSn2Pb trigonal pyramids, corners with two equivalent S(5)TbSn2Pb trigonal pyramids, and  an edgeedge with one S(5)TbSn2Pb trigonal pyramid. In the fifth S site, S(5) is bonded to one Tb(2), one Pb(3), and two equivalent Sn(1) atoms to form a mixture of distorted corner and edge-sharing STbSn2Pb trigonal pyramids. In the sixth S site, S(6) is bonded in a 4-coordinate geometry to one Tb(2), one Pb(1), and two equivalent Sn(2) atoms. In the seventh S site, S(7) is bonded to one Tb(2), one Pb(2), and two equivalent Sn(2) atoms to form distorted STbSn2Pb trigonal pyramids that share  a cornercorner with one S(5)TbSn2Pb trigonal pyramid, corners with two equivalent S(7)TbSn2Pb trigonal pyramids, and edges with two equivalent S(9)SnPb4 square pyramids. In the eighth S site, S(8) is bonded in a 3-coordinate geometry to one Tb(1), one Pb(3), and two equivalent Sn(3) atoms. In the ninth S site, S(9) is bonded to two equivalent Pb(1), two equivalent Pb(2), and one Sn(2) atom to form distorted SSnPb4 square pyramids that share corners with two equivalent S(4)TbSn2Pb trigonal pyramids, edges with two equivalent S(9)SnPb4 square pyramids, and edges with two equivalent S(7)TbSn2Pb trigonal pyramids. In the tenth S site, S(10) is bonded in a 5-coordinate geometry to two equivalent Tb(2), two equivalent Pb(2), and one Sn(2) atom. In the eleventh S site, S(11) is bonded in a 5-coordinate geometry to two equivalent Tb(1), two equivalent Pb(1), and one Sn(3) atom. In the twelfth S site, S(12) is bonded in a distorted single-bond geometry to two equivalent Pb(3) and one Sn(3) atom. is represented by the CIF file [CIF]
data_Tb2Sn3(PbS4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.956
_cell_length_b   11.691
_cell_length_c   20.548
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   950.407
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Tb  Tb0  1  0.500  0.648  0.412  1.0
  Tb  Tb1  1  0.500  0.148  0.588  1.0
  Tb  Tb2  1  0.500  0.825  0.895  1.0
  Tb  Tb3  1  0.500  0.325  0.105  1.0
  Sn  Sn4  1  0.000  0.002  0.750  1.0
  Sn  Sn5  1  0.000  0.502  0.250  1.0
  Sn  Sn6  1  0.000  0.519  0.912  1.0
  Sn  Sn7  1  0.000  0.019  0.088  1.0
  Sn  Sn8  1  0.000  0.993  0.426  1.0
  Sn  Sn9  1  0.000  0.493  0.574  1.0
  Pb  Pb10  1  0.500  0.404  0.742  1.0
  Pb  Pb11  1  0.500  0.904  0.258  1.0
  Pb  Pb12  1  0.500  0.199  0.914  1.0
  Pb  Pb13  1  0.500  0.699  0.086  1.0
  Pb  Pb14  1  0.500  0.772  0.622  1.0
  Pb  Pb15  1  0.500  0.272  0.378  1.0
  S  S16  1  0.000  0.992  0.876  1.0
  S  S17  1  0.000  0.492  0.124  1.0
  S  S18  1  0.000  0.984  0.626  1.0
  S  S19  1  0.000  0.484  0.374  1.0
  S  S20  1  0.000  0.683  0.509  1.0
  S  S21  1  0.000  0.183  0.491  1.0
  S  S22  1  0.500  0.647  0.258  1.0
  S  S23  1  0.500  0.147  0.742  1.0
  S  S24  1  0.500  0.850  0.757  1.0
  S  S25  1  0.500  0.350  0.243  1.0
  S  S26  1  0.500  0.601  0.841  1.0
  S  S27  1  0.500  0.101  0.159  1.0
  S  S28  1  0.500  0.437  0.982  1.0
  S  S29  1  0.500  0.937  0.018  1.0
  S  S30  1  0.500  0.937  0.492  1.0
  S  S31  1  0.500  0.437  0.508  1.0
  S  S32  1  0.000  0.338  0.843  1.0
  S  S33  1  0.000  0.838  0.157  1.0
  S  S34  1  0.000  0.714  0.970  1.0
  S  S35  1  0.000  0.214  0.030  1.0
  S  S36  1  0.000  0.805  0.361  1.0
  S  S37  1  0.000  0.305  0.639  1.0
  S  S38  1  0.000  0.601  0.676  1.0
  S  S39  1  0.000  0.101  0.324  1.0
[/CIF]
.
The structure described by Tb2Sn3(PbS4)3 crystallizes in the orthorhombic Pmc2_1 space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 8-coordinate geometry to one S(4), one S(8), two equivalent S(11), two equivalent S(2), and two equivalent S(3) atoms. In the second Tb site, Tb(2) is bonded to one S(5), one S(6), one S(7), two equivalent S(1), and two equivalent S(10) atoms to form distorted TbS7 pentagonal bipyramids that share corners with two equivalent Sn(2)S6 octahedra, edges with two equivalent Sn(1)S6 octahedra, edges with two equivalent Sn(2)S6 octahedra, and edges with two equivalent Tb(2)S7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 49°. There are three inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 6-coordinate geometry to one S(4), one S(6), two equivalent S(11), and two equivalent S(9) atoms. In the second Pb site, Pb(2) is bonded in a 7-coordinate geometry to one S(7), two equivalent S(1), two equivalent S(10), and two equivalent S(9) atoms. In the third Pb site, Pb(3) is bonded in a 8-coordinate geometry to one S(5), one S(8), two equivalent S(12), two equivalent S(2), and two equivalent S(3) atoms. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one S(1), one S(2), two equivalent S(4), and two equivalent S(5) atoms to form SnS6 octahedra that share edges with two equivalent Sn(1)S6 octahedra and edges with two equivalent Tb(2)S7 pentagonal bipyramids. In the second Sn site, Sn(2) is bonded to one S(10), one S(9), two equivalent S(6), and two equivalent S(7) atoms to form SnS6 octahedra that share corners with two equivalent Tb(2)S7 pentagonal bipyramids, edges with two equivalent Sn(2)S6 octahedra, and edges with two equivalent Tb(2)S7 pentagonal bipyramids. In the third Sn site, Sn(3) is bonded to one S(11), one S(12), one S(3), and two equivalent S(8) atoms to form corner-sharing SnS5 trigonal bipyramids. There are twelve inequivalent S sites. In the first S site, S(1) is bonded in a 3-coordinate geometry to two equivalent Tb(2), two equivalent Pb(2), and one Sn(1) atom. In the second S site, S(2) is bonded in a 3-coordinate geometry to two equivalent Tb(1), two equivalent Pb(3), and one Sn(1) atom. In the third S site, S(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Tb(1), two equivalent Pb(3), and one Sn(3) atom. In the fourth S site, S(4) is bonded to one Tb(1), one Pb(1), and two equivalent Sn(1) atoms to form distorted STbSn2Pb trigonal pyramids that share corners with two equivalent S(9)SnPb4 square pyramids, corners with two equivalent S(4)TbSn2Pb trigonal pyramids, corners with two equivalent S(5)TbSn2Pb trigonal pyramids, and  an edgeedge with one S(5)TbSn2Pb trigonal pyramid. In the fifth S site, S(5) is bonded to one Tb(2), one Pb(3), and two equivalent Sn(1) atoms to form a mixture of distorted corner and edge-sharing STbSn2Pb trigonal pyramids. In the sixth S site, S(6) is bonded in a 4-coordinate geometry to one Tb(2), one Pb(1), and two equivalent Sn(2) atoms. In the seventh S site, S(7) is bonded to one Tb(2), one Pb(2), and two equivalent Sn(2) atoms to form distorted STbSn2Pb trigonal pyramids that share  a cornercorner with one S(5)TbSn2Pb trigonal pyramid, corners with two equivalent S(7)TbSn2Pb trigonal pyramids, and edges with two equivalent S(9)SnPb4 square pyramids. In the eighth S site, S(8) is bonded in a 3-coordinate geometry to one Tb(1), one Pb(3), and two equivalent Sn(3) atoms. In the ninth S site, S(9) is bonded to two equivalent Pb(1), two equivalent Pb(2), and one Sn(2) atom to form distorted SSnPb4 square pyramids that share corners with two equivalent S(4)TbSn2Pb trigonal pyramids, edges with two equivalent S(9)SnPb4 square pyramids, and edges with two equivalent S(7)TbSn2Pb trigonal pyramids. In the tenth S site, S(10) is bonded in a 5-coordinate geometry to two equivalent Tb(2), two equivalent Pb(2), and one Sn(2) atom. In the eleventh S site, S(11) is bonded in a 5-coordinate geometry to two equivalent Tb(1), two equivalent Pb(1), and one Sn(3) atom. In the twelfth S site, S(12) is bonded in a distorted single-bond geometry to two equivalent Pb(3) and one Sn(3) atom. is represented by the CIF file [CIF]
data_Tb2Sn3(PbS4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.956
_cell_length_b   11.691
_cell_length_c   20.548
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   950.407
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Tb  Tb0  1  0.500  0.648  0.412  1.0
  Tb  Tb1  1  0.500  0.148  0.588  1.0
  Tb  Tb2  1  0.500  0.825  0.895  1.0
  Tb  Tb3  1  0.500  0.325  0.105  1.0
  Sn  Sn4  1  0.000  0.002  0.750  1.0
  Sn  Sn5  1  0.000  0.502  0.250  1.0
  Sn  Sn6  1  0.000  0.519  0.912  1.0
  Sn  Sn7  1  0.000  0.019  0.088  1.0
  Sn  Sn8  1  0.000  0.993  0.426  1.0
  Sn  Sn9  1  0.000  0.493  0.574  1.0
  Pb  Pb10  1  0.500  0.404  0.742  1.0
  Pb  Pb11  1  0.500  0.904  0.258  1.0
  Pb  Pb12  1  0.500  0.199  0.914  1.0
  Pb  Pb13  1  0.500  0.699  0.086  1.0
  Pb  Pb14  1  0.500  0.772  0.622  1.0
  Pb  Pb15  1  0.500  0.272  0.378  1.0
  S  S16  1  0.000  0.992  0.876  1.0
  S  S17  1  0.000  0.492  0.124  1.0
  S  S18  1  0.000  0.984  0.626  1.0
  S  S19  1  0.000  0.484  0.374  1.0
  S  S20  1  0.000  0.683  0.509  1.0
  S  S21  1  0.000  0.183  0.491  1.0
  S  S22  1  0.500  0.647  0.258  1.0
  S  S23  1  0.500  0.147  0.742  1.0
  S  S24  1  0.500  0.850  0.757  1.0
  S  S25  1  0.500  0.350  0.243  1.0
  S  S26  1  0.500  0.601  0.841  1.0
  S  S27  1  0.500  0.101  0.159  1.0
  S  S28  1  0.500  0.437  0.982  1.0
  S  S29  1  0.500  0.937  0.018  1.0
  S  S30  1  0.500  0.937  0.492  1.0
  S  S31  1  0.500  0.437  0.508  1.0
  S  S32  1  0.000  0.338  0.843  1.0
  S  S33  1  0.000  0.838  0.157  1.0
  S  S34  1  0.000  0.714  0.970  1.0
  S  S35  1  0.000  0.214  0.030  1.0
  S  S36  1  0.000  0.805  0.361  1.0
  S  S37  1  0.000  0.305  0.639  1.0
  S  S38  1  0.000  0.601  0.676  1.0
  S  S39  1  0.000  0.101  0.324  1.0
[/CIF]
.