The structure described by TbCuPbSe3 crystallizes in the orthorhombic Pnma space group. Tb(1) is bonded to two equivalent Se(1), two equivalent Se(2), and two equivalent Se(3) atoms to form TbSe6 octahedra that share corners with two equivalent Tb(1)Se6 octahedra, edges with two equivalent Tb(1)Se6 octahedra, and edges with four equivalent Cu(1)Se4 tetrahedra. The corner-sharing octahedral tilt angles are 44°. Cu(1) is bonded to one Se(1), one Se(2), and two equivalent Se(3) atoms to form CuSe4 tetrahedra that share corners with two equivalent Cu(1)Se4 tetrahedra and edges with four equivalent Tb(1)Se6 octahedra. Pb(1) is bonded in a 7-coordinate geometry to two equivalent Se(2), two equivalent Se(3), and three equivalent Se(1) atoms. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 3-coordinate geometry to two equivalent Tb(1), one Cu(1), and three equivalent Pb(1) atoms. In the second Se site, Se(2) is bonded in a 3-coordinate geometry to two equivalent Tb(1), one Cu(1), and two equivalent Pb(1) atoms. In the third Se site, Se(3) is bonded in a 6-coordinate geometry to two equivalent Tb(1), two equivalent Cu(1), and two equivalent Pb(1) atoms. is represented by the CIF card [CIF]
data_TbCuPbSe3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.070
_cell_length_b   10.679
_cell_length_c   13.640
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   592.803
_cell_formula_units_Z   4
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  0.250  0.486  0.742  1.0
  Tb  Tb1  1  0.750  0.014  0.242  1.0
  Tb  Tb2  1  0.250  0.986  0.758  1.0
  Tb  Tb3  1  0.750  0.514  0.258  1.0
  Cu  Cu4  1  0.750  0.742  0.781  1.0
  Cu  Cu5  1  0.250  0.758  0.281  1.0
  Cu  Cu6  1  0.750  0.242  0.719  1.0
  Cu  Cu7  1  0.250  0.258  0.219  1.0
  Pb  Pb8  1  0.250  0.725  0.996  1.0
  Pb  Pb9  1  0.750  0.275  0.004  1.0
  Pb  Pb10  1  0.750  0.775  0.496  1.0
  Pb  Pb11  1  0.250  0.225  0.504  1.0
  Se  Se12  1  0.250  0.448  0.114  1.0
  Se  Se13  1  0.750  0.417  0.604  1.0
  Se  Se14  1  0.250  0.083  0.104  1.0
  Se  Se15  1  0.750  0.552  0.886  1.0
  Se  Se16  1  0.250  0.948  0.386  1.0
  Se  Se17  1  0.250  0.583  0.396  1.0
  Se  Se18  1  0.750  0.760  0.172  1.0
  Se  Se19  1  0.750  0.052  0.614  1.0
  Se  Se20  1  0.750  0.917  0.896  1.0
  Se  Se21  1  0.750  0.260  0.328  1.0
  Se  Se22  1  0.250  0.240  0.828  1.0
  Se  Se23  1  0.250  0.740  0.672  1.0
[/CIF]
.
The structure described by TbCuPbSe3 crystallizes in the orthorhombic Pnma space group. Tb(1) is bonded to two equivalent Se(1), two equivalent Se(2), and two equivalent Se(3) atoms to form TbSe6 octahedra that share corners with two equivalent Tb(1)Se6 octahedra, edges with two equivalent Tb(1)Se6 octahedra, and edges with four equivalent Cu(1)Se4 tetrahedra. The corner-sharing octahedral tilt angles are 44°. Cu(1) is bonded to one Se(1), one Se(2), and two equivalent Se(3) atoms to form CuSe4 tetrahedra that share corners with two equivalent Cu(1)Se4 tetrahedra and edges with four equivalent Tb(1)Se6 octahedra. Pb(1) is bonded in a 7-coordinate geometry to two equivalent Se(2), two equivalent Se(3), and three equivalent Se(1) atoms. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 3-coordinate geometry to two equivalent Tb(1), one Cu(1), and three equivalent Pb(1) atoms. In the second Se site, Se(2) is bonded in a 3-coordinate geometry to two equivalent Tb(1), one Cu(1), and two equivalent Pb(1) atoms. In the third Se site, Se(3) is bonded in a 6-coordinate geometry to two equivalent Tb(1), two equivalent Cu(1), and two equivalent Pb(1) atoms. is represented by the CIF card [CIF]
data_TbCuPbSe3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.070
_cell_length_b   10.679
_cell_length_c   13.640
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   592.803
_cell_formula_units_Z   4
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  0.250  0.486  0.742  1.0
  Tb  Tb1  1  0.750  0.014  0.242  1.0
  Tb  Tb2  1  0.250  0.986  0.758  1.0
  Tb  Tb3  1  0.750  0.514  0.258  1.0
  Cu  Cu4  1  0.750  0.742  0.781  1.0
  Cu  Cu5  1  0.250  0.758  0.281  1.0
  Cu  Cu6  1  0.750  0.242  0.719  1.0
  Cu  Cu7  1  0.250  0.258  0.219  1.0
  Pb  Pb8  1  0.250  0.725  0.996  1.0
  Pb  Pb9  1  0.750  0.275  0.004  1.0
  Pb  Pb10  1  0.750  0.775  0.496  1.0
  Pb  Pb11  1  0.250  0.225  0.504  1.0
  Se  Se12  1  0.250  0.448  0.114  1.0
  Se  Se13  1  0.750  0.417  0.604  1.0
  Se  Se14  1  0.250  0.083  0.104  1.0
  Se  Se15  1  0.750  0.552  0.886  1.0
  Se  Se16  1  0.250  0.948  0.386  1.0
  Se  Se17  1  0.250  0.583  0.396  1.0
  Se  Se18  1  0.750  0.760  0.172  1.0
  Se  Se19  1  0.750  0.052  0.614  1.0
  Se  Se20  1  0.750  0.917  0.896  1.0
  Se  Se21  1  0.750  0.260  0.328  1.0
  Se  Se22  1  0.250  0.240  0.828  1.0
  Se  Se23  1  0.250  0.740  0.672  1.0
[/CIF]
.