The crystal structure described by Tb8Cu3Te16 crystallizes in the triclinic P1 space group. There are eight inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 9-coordinate geometry to one Cu(1), one Te(1), one Te(10), one Te(12), one Te(14), one Te(15), one Te(2), one Te(5), and one Te(8) atom. In the second Tb site, Tb(2) is bonded in a 9-coordinate geometry to one Cu(1), one Te(1), one Te(13), one Te(15), one Te(2), one Te(3), one Te(4), one Te(7), and one Te(8) atom. In the third Tb site, Tb(3) is bonded in a 9-coordinate geometry to one Cu(2), one Te(10), one Te(13), one Te(16), one Te(2), one Te(4), one Te(6), one Te(7), and one Te(9) atom. In the fourth Tb site, Tb(4) is bonded in a 9-coordinate geometry to one Cu(2), one Te(1), one Te(11), one Te(12), one Te(3), one Te(5), one Te(6), one Te(7), and one Te(8) atom. In the fifth Tb site, Tb(5) is bonded in a 10-coordinate geometry to one Cu(2), one Cu(3), one Te(10), one Te(11), one Te(12), one Te(15), one Te(16), one Te(5), one Te(7), and one Te(9) atom. In the sixth Tb site, Tb(6) is bonded in a 9-coordinate geometry to one Cu(3), one Te(1), one Te(10), one Te(11), one Te(13), one Te(14), one Te(4), one Te(6), and one Te(8) atom. In the seventh Tb site, Tb(7) is bonded in a 9-coordinate geometry to one Cu(3), one Te(11), one Te(13), one Te(14), one Te(15), one Te(16), one Te(3), one Te(4), and one Te(9) atom. In the eighth Tb site, Tb(8) is bonded in a 9-coordinate geometry to one Cu(1), one Te(12), one Te(14), one Te(16), one Te(2), one Te(3), one Te(5), one Te(6), and one Te(9) atom. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 7-coordinate geometry to one Tb(1), one Tb(2), one Tb(8), one Te(1), one Te(14), one Te(2), and one Te(3) atom. In the second Cu site, Cu(2) is bonded in a 7-coordinate geometry to one Tb(3), one Tb(4), one Tb(5), one Te(11), one Te(6), one Te(7), and one Te(9) atom. In the third Cu site, Cu(3) is bonded in a 7-coordinate geometry to one Tb(5), one Tb(6), one Tb(7), one Te(10), one Te(11), one Te(13), and one Te(15) atom. There are sixteen inequivalent Te sites. In the first Te site, Te(1) is bonded in a 7-coordinate geometry to one Tb(1), one Tb(2), one Tb(4), one Tb(6), one Cu(1), one Te(12), and one Te(4) atom. In the second Te site, Te(2) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(2), one Tb(3), one Tb(8), and one Cu(1) atom. In the third Te site, Te(3) is bonded in a distorted trigonal bipyramidal geometry to one Tb(2), one Tb(4), one Tb(7), one Tb(8), and one Cu(1) atom. In the fourth Te site, Te(4) is bonded in a 4-coordinate geometry to one Tb(2), one Tb(3), one Tb(6), one Tb(7), and one Te(1) atom. In the fifth Te site, Te(5) is bonded in a 4-coordinate geometry to one Tb(1), one Tb(4), one Tb(5), and one Tb(8) atom. In the sixth Te site, Te(6) is bonded in a 5-coordinate geometry to one Tb(3), one Tb(4), one Tb(6), one Tb(8), and one Cu(2) atom. In the seventh Te site, Te(7) is bonded in a 5-coordinate geometry to one Tb(2), one Tb(3), one Tb(4), one Tb(5), and one Cu(2) atom. In the eighth Te site, Te(8) is bonded in a 4-coordinate geometry to one Tb(1), one Tb(2), one Tb(4), and one Tb(6) atom. In the ninth Te site, Te(9) is bonded in a 5-coordinate geometry to one Tb(3), one Tb(5), one Tb(7), one Tb(8), and one Cu(2) atom. In the tenth Te site, Te(10) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(3), one Tb(5), one Tb(6), and one Cu(3) atom. In the eleventh Te site, Te(11) is bonded in a 6-coordinate geometry to one Tb(4), one Tb(5), one Tb(6), one Tb(7), one Cu(2), and one Cu(3) atom. In the twelfth Te site, Te(12) is bonded in a 4-coordinate geometry to one Tb(1), one Tb(4), one Tb(5), one Tb(8), and one Te(1) atom. In the thirteenth Te site, Te(13) is bonded in a 5-coordinate geometry to one Tb(2), one Tb(3), one Tb(6), one Tb(7), and one Cu(3) atom. In the fourteenth Te site, Te(14) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(6), one Tb(7), one Tb(8), and one Cu(1) atom. In the fifteenth Te site, Te(15) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(2), one Tb(5), one Tb(7), and one Cu(3) atom. In the sixteenth Te site, Te(16) is bonded in a 4-coordinate geometry to one Tb(3), one Tb(5), one Tb(7), and one Tb(8) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Tb8Cu3Te16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.546
_cell_length_b   9.863
_cell_length_c   8.133
_cell_angle_alpha   90.145
_cell_angle_beta   90.259
_cell_angle_gamma   50.523
_symmetry_Int_Tables_number   1
_cell_volume   776.806
_cell_formula_units_Z   1
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  0.002  0.239  0.440  1.0
  Tb  Tb1  1  0.256  0.235  0.057  1.0
  Tb  Tb2  1  0.508  0.235  0.444  1.0
  Tb  Tb3  1  0.240  0.764  0.945  1.0
  Tb  Tb4  1  0.762  0.232  0.061  1.0
  Tb  Tb5  1  0.492  0.766  0.554  1.0
  Tb  Tb6  1  0.749  0.761  0.942  1.0
  Tb  Tb7  1  0.994  0.763  0.556  1.0
  Cu  Cu8  1  0.087  0.403  0.696  1.0
  Cu  Cu9  1  0.508  0.400  0.805  1.0
  Cu  Cu10  1  0.665  0.595  0.198  1.0
  Te  Te11  1  0.214  0.071  0.752  1.0
  Te  Te12  1  0.186  0.394  0.405  1.0
  Te  Te13  1  0.067  0.611  0.914  1.0
  Te  Te14  1  0.467  0.065  0.751  1.0
  Te  Te15  1  0.037  0.925  0.251  1.0
  Te  Te16  1  0.323  0.612  0.588  1.0
  Te  Te17  1  0.422  0.394  0.097  1.0
  Te  Te18  1  0.281  0.933  0.251  1.0
  Te  Te19  1  0.715  0.071  0.748  1.0
  Te  Te20  1  0.683  0.390  0.414  1.0
  Te  Te21  1  0.563  0.608  0.906  1.0
  Te  Te22  1  0.964  0.072  0.749  1.0
  Te  Te23  1  0.535  0.928  0.250  1.0
  Te  Te24  1  0.824  0.610  0.592  1.0
  Te  Te25  1  0.926  0.391  0.091  1.0
  Te  Te26  1  0.787  0.929  0.249  1.0
[/CIF]
.
The crystal structure described by Tb8Cu3Te16 crystallizes in the triclinic P1 space group. There are eight inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 9-coordinate geometry to one Cu(1), one Te(1), one Te(10), one Te(12), one Te(14), one Te(15), one Te(2), one Te(5), and one Te(8) atom. In the second Tb site, Tb(2) is bonded in a 9-coordinate geometry to one Cu(1), one Te(1), one Te(13), one Te(15), one Te(2), one Te(3), one Te(4), one Te(7), and one Te(8) atom. In the third Tb site, Tb(3) is bonded in a 9-coordinate geometry to one Cu(2), one Te(10), one Te(13), one Te(16), one Te(2), one Te(4), one Te(6), one Te(7), and one Te(9) atom. In the fourth Tb site, Tb(4) is bonded in a 9-coordinate geometry to one Cu(2), one Te(1), one Te(11), one Te(12), one Te(3), one Te(5), one Te(6), one Te(7), and one Te(8) atom. In the fifth Tb site, Tb(5) is bonded in a 10-coordinate geometry to one Cu(2), one Cu(3), one Te(10), one Te(11), one Te(12), one Te(15), one Te(16), one Te(5), one Te(7), and one Te(9) atom. In the sixth Tb site, Tb(6) is bonded in a 9-coordinate geometry to one Cu(3), one Te(1), one Te(10), one Te(11), one Te(13), one Te(14), one Te(4), one Te(6), and one Te(8) atom. In the seventh Tb site, Tb(7) is bonded in a 9-coordinate geometry to one Cu(3), one Te(11), one Te(13), one Te(14), one Te(15), one Te(16), one Te(3), one Te(4), and one Te(9) atom. In the eighth Tb site, Tb(8) is bonded in a 9-coordinate geometry to one Cu(1), one Te(12), one Te(14), one Te(16), one Te(2), one Te(3), one Te(5), one Te(6), and one Te(9) atom. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 7-coordinate geometry to one Tb(1), one Tb(2), one Tb(8), one Te(1), one Te(14), one Te(2), and one Te(3) atom. In the second Cu site, Cu(2) is bonded in a 7-coordinate geometry to one Tb(3), one Tb(4), one Tb(5), one Te(11), one Te(6), one Te(7), and one Te(9) atom. In the third Cu site, Cu(3) is bonded in a 7-coordinate geometry to one Tb(5), one Tb(6), one Tb(7), one Te(10), one Te(11), one Te(13), and one Te(15) atom. There are sixteen inequivalent Te sites. In the first Te site, Te(1) is bonded in a 7-coordinate geometry to one Tb(1), one Tb(2), one Tb(4), one Tb(6), one Cu(1), one Te(12), and one Te(4) atom. In the second Te site, Te(2) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(2), one Tb(3), one Tb(8), and one Cu(1) atom. In the third Te site, Te(3) is bonded in a distorted trigonal bipyramidal geometry to one Tb(2), one Tb(4), one Tb(7), one Tb(8), and one Cu(1) atom. In the fourth Te site, Te(4) is bonded in a 4-coordinate geometry to one Tb(2), one Tb(3), one Tb(6), one Tb(7), and one Te(1) atom. In the fifth Te site, Te(5) is bonded in a 4-coordinate geometry to one Tb(1), one Tb(4), one Tb(5), and one Tb(8) atom. In the sixth Te site, Te(6) is bonded in a 5-coordinate geometry to one Tb(3), one Tb(4), one Tb(6), one Tb(8), and one Cu(2) atom. In the seventh Te site, Te(7) is bonded in a 5-coordinate geometry to one Tb(2), one Tb(3), one Tb(4), one Tb(5), and one Cu(2) atom. In the eighth Te site, Te(8) is bonded in a 4-coordinate geometry to one Tb(1), one Tb(2), one Tb(4), and one Tb(6) atom. In the ninth Te site, Te(9) is bonded in a 5-coordinate geometry to one Tb(3), one Tb(5), one Tb(7), one Tb(8), and one Cu(2) atom. In the tenth Te site, Te(10) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(3), one Tb(5), one Tb(6), and one Cu(3) atom. In the eleventh Te site, Te(11) is bonded in a 6-coordinate geometry to one Tb(4), one Tb(5), one Tb(6), one Tb(7), one Cu(2), and one Cu(3) atom. In the twelfth Te site, Te(12) is bonded in a 4-coordinate geometry to one Tb(1), one Tb(4), one Tb(5), one Tb(8), and one Te(1) atom. In the thirteenth Te site, Te(13) is bonded in a 5-coordinate geometry to one Tb(2), one Tb(3), one Tb(6), one Tb(7), and one Cu(3) atom. In the fourteenth Te site, Te(14) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(6), one Tb(7), one Tb(8), and one Cu(1) atom. In the fifteenth Te site, Te(15) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(2), one Tb(5), one Tb(7), and one Cu(3) atom. In the sixteenth Te site, Te(16) is bonded in a 4-coordinate geometry to one Tb(3), one Tb(5), one Tb(7), and one Tb(8) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Tb8Cu3Te16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.546
_cell_length_b   9.863
_cell_length_c   8.133
_cell_angle_alpha   90.145
_cell_angle_beta   90.259
_cell_angle_gamma   50.523
_symmetry_Int_Tables_number   1
_cell_volume   776.806
_cell_formula_units_Z   1
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  0.002  0.239  0.440  1.0
  Tb  Tb1  1  0.256  0.235  0.057  1.0
  Tb  Tb2  1  0.508  0.235  0.444  1.0
  Tb  Tb3  1  0.240  0.764  0.945  1.0
  Tb  Tb4  1  0.762  0.232  0.061  1.0
  Tb  Tb5  1  0.492  0.766  0.554  1.0
  Tb  Tb6  1  0.749  0.761  0.942  1.0
  Tb  Tb7  1  0.994  0.763  0.556  1.0
  Cu  Cu8  1  0.087  0.403  0.696  1.0
  Cu  Cu9  1  0.508  0.400  0.805  1.0
  Cu  Cu10  1  0.665  0.595  0.198  1.0
  Te  Te11  1  0.214  0.071  0.752  1.0
  Te  Te12  1  0.186  0.394  0.405  1.0
  Te  Te13  1  0.067  0.611  0.914  1.0
  Te  Te14  1  0.467  0.065  0.751  1.0
  Te  Te15  1  0.037  0.925  0.251  1.0
  Te  Te16  1  0.323  0.612  0.588  1.0
  Te  Te17  1  0.422  0.394  0.097  1.0
  Te  Te18  1  0.281  0.933  0.251  1.0
  Te  Te19  1  0.715  0.071  0.748  1.0
  Te  Te20  1  0.683  0.390  0.414  1.0
  Te  Te21  1  0.563  0.608  0.906  1.0
  Te  Te22  1  0.964  0.072  0.749  1.0
  Te  Te23  1  0.535  0.928  0.250  1.0
  Te  Te24  1  0.824  0.610  0.592  1.0
  Te  Te25  1  0.926  0.391  0.091  1.0
  Te  Te26  1  0.787  0.929  0.249  1.0
[/CIF]
.