The material structure described by Tb2Cu(BO2)8 crystallizes in the monoclinic P2_1/c space group. Tb(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(7), one O(8), and two equivalent O(6) atoms. Cu(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(7) atoms. There are four inequivalent B sites. In the first B site, B(1) is bonded in a tetrahedral geometry to one O(2), one O(4), one O(5), and one O(8) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(7) atom. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(6) atom. In the fourth B site, B(4) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Tb(1), one B(1), and one B(4) atom. In the second O site, O(1) is bonded in a 3-coordinate geometry to one Tb(1), one Cu(1), and one B(4) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Tb(1), one B(1), and one B(2) atom. In the fourth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cu(1), one B(2), and one B(4) atom. In the fifth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Tb(1), one B(1), and one B(3) atom. In the sixth O site, O(5) is bonded in a 2-coordinate geometry to one Tb(1), one B(1), and one B(3) atom. In the seventh O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Tb(1) and one B(3) atom. In the eighth O site, O(7) is bonded in a 3-coordinate geometry to one Tb(1), one Cu(1), and one B(2) atom. is represented by the CIF file [CIF]
data_Tb2Cu(BO2)8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.467
_cell_length_b   6.298
_cell_length_c   10.289
_cell_angle_alpha   89.564
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   548.605
_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  0.011  0.493  0.818  1.0
  Tb  Tb1  1  0.511  0.007  0.182  1.0
  Tb  Tb2  1  0.489  0.993  0.818  1.0
  Tb  Tb3  1  0.989  0.507  0.182  1.0
  Cu  Cu4  1  0.500  0.000  0.500  1.0
  Cu  Cu5  1  0.000  0.500  0.500  1.0
  B  B6  1  0.006  0.992  0.806  1.0
  B  B7  1  0.807  0.878  0.629  1.0
  B  B8  1  0.681  0.610  0.999  1.0
  B  B9  1  0.494  0.492  0.806  1.0
  B  B10  1  0.819  0.110  0.999  1.0
  B  B11  1  0.307  0.622  0.371  1.0
  B  B12  1  0.689  0.386  0.385  1.0
  B  B13  1  0.311  0.614  0.615  1.0
  B  B14  1  0.994  0.008  0.194  1.0
  B  B15  1  0.506  0.508  0.194  1.0
  B  B16  1  0.693  0.378  0.629  1.0
  B  B17  1  0.811  0.886  0.385  1.0
  B  B18  1  0.319  0.390  0.001  1.0
  B  B19  1  0.189  0.114  0.615  1.0
  B  B20  1  0.181  0.890  0.001  1.0
  B  B21  1  0.193  0.122  0.371  1.0
  O  O22  1  0.659  0.944  0.365  1.0
  O  O23  1  0.404  0.659  0.263  1.0
  O  O24  1  0.625  0.350  0.507  1.0
  O  O25  1  0.618  0.651  0.123  1.0
  O  O26  1  0.096  0.159  0.263  1.0
  O  O27  1  0.920  0.138  0.893  1.0
  O  O28  1  0.596  0.341  0.737  1.0
  O  O29  1  0.159  0.556  0.635  1.0
  O  O30  1  0.835  0.557  0.988  1.0
  O  O31  1  0.655  0.937  0.645  1.0
  O  O32  1  0.382  0.349  0.877  1.0
  O  O33  1  0.345  0.063  0.355  1.0
  O  O34  1  0.341  0.056  0.635  1.0
  O  O35  1  0.420  0.362  0.107  1.0
  O  O36  1  0.589  0.355  0.279  1.0
  O  O37  1  0.875  0.850  0.507  1.0
  O  O38  1  0.118  0.849  0.877  1.0
  O  O39  1  0.089  0.145  0.721  1.0
  O  O40  1  0.155  0.563  0.355  1.0
  O  O41  1  0.375  0.650  0.493  1.0
  O  O42  1  0.125  0.150  0.493  1.0
  O  O43  1  0.845  0.437  0.645  1.0
  O  O44  1  0.841  0.444  0.365  1.0
  O  O45  1  0.411  0.645  0.721  1.0
  O  O46  1  0.580  0.638  0.893  1.0
  O  O47  1  0.165  0.443  0.012  1.0
  O  O48  1  0.080  0.862  0.107  1.0
  O  O49  1  0.335  0.943  0.012  1.0
  O  O50  1  0.882  0.151  0.123  1.0
  O  O51  1  0.665  0.057  0.988  1.0
  O  O52  1  0.911  0.855  0.279  1.0
  O  O53  1  0.904  0.841  0.737  1.0
[/CIF]
.
The material structure described by Tb2Cu(BO2)8 crystallizes in the monoclinic P2_1/c space group. Tb(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(7), one O(8), and two equivalent O(6) atoms. Cu(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(7) atoms. There are four inequivalent B sites. In the first B site, B(1) is bonded in a tetrahedral geometry to one O(2), one O(4), one O(5), and one O(8) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(7) atom. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(6) atom. In the fourth B site, B(4) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Tb(1), one B(1), and one B(4) atom. In the second O site, O(1) is bonded in a 3-coordinate geometry to one Tb(1), one Cu(1), and one B(4) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Tb(1), one B(1), and one B(2) atom. In the fourth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cu(1), one B(2), and one B(4) atom. In the fifth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Tb(1), one B(1), and one B(3) atom. In the sixth O site, O(5) is bonded in a 2-coordinate geometry to one Tb(1), one B(1), and one B(3) atom. In the seventh O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Tb(1) and one B(3) atom. In the eighth O site, O(7) is bonded in a 3-coordinate geometry to one Tb(1), one Cu(1), and one B(2) atom. is represented by the CIF file [CIF]
data_Tb2Cu(BO2)8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.467
_cell_length_b   6.298
_cell_length_c   10.289
_cell_angle_alpha   89.564
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   548.605
_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  0.011  0.493  0.818  1.0
  Tb  Tb1  1  0.511  0.007  0.182  1.0
  Tb  Tb2  1  0.489  0.993  0.818  1.0
  Tb  Tb3  1  0.989  0.507  0.182  1.0
  Cu  Cu4  1  0.500  0.000  0.500  1.0
  Cu  Cu5  1  0.000  0.500  0.500  1.0
  B  B6  1  0.006  0.992  0.806  1.0
  B  B7  1  0.807  0.878  0.629  1.0
  B  B8  1  0.681  0.610  0.999  1.0
  B  B9  1  0.494  0.492  0.806  1.0
  B  B10  1  0.819  0.110  0.999  1.0
  B  B11  1  0.307  0.622  0.371  1.0
  B  B12  1  0.689  0.386  0.385  1.0
  B  B13  1  0.311  0.614  0.615  1.0
  B  B14  1  0.994  0.008  0.194  1.0
  B  B15  1  0.506  0.508  0.194  1.0
  B  B16  1  0.693  0.378  0.629  1.0
  B  B17  1  0.811  0.886  0.385  1.0
  B  B18  1  0.319  0.390  0.001  1.0
  B  B19  1  0.189  0.114  0.615  1.0
  B  B20  1  0.181  0.890  0.001  1.0
  B  B21  1  0.193  0.122  0.371  1.0
  O  O22  1  0.659  0.944  0.365  1.0
  O  O23  1  0.404  0.659  0.263  1.0
  O  O24  1  0.625  0.350  0.507  1.0
  O  O25  1  0.618  0.651  0.123  1.0
  O  O26  1  0.096  0.159  0.263  1.0
  O  O27  1  0.920  0.138  0.893  1.0
  O  O28  1  0.596  0.341  0.737  1.0
  O  O29  1  0.159  0.556  0.635  1.0
  O  O30  1  0.835  0.557  0.988  1.0
  O  O31  1  0.655  0.937  0.645  1.0
  O  O32  1  0.382  0.349  0.877  1.0
  O  O33  1  0.345  0.063  0.355  1.0
  O  O34  1  0.341  0.056  0.635  1.0
  O  O35  1  0.420  0.362  0.107  1.0
  O  O36  1  0.589  0.355  0.279  1.0
  O  O37  1  0.875  0.850  0.507  1.0
  O  O38  1  0.118  0.849  0.877  1.0
  O  O39  1  0.089  0.145  0.721  1.0
  O  O40  1  0.155  0.563  0.355  1.0
  O  O41  1  0.375  0.650  0.493  1.0
  O  O42  1  0.125  0.150  0.493  1.0
  O  O43  1  0.845  0.437  0.645  1.0
  O  O44  1  0.841  0.444  0.365  1.0
  O  O45  1  0.411  0.645  0.721  1.0
  O  O46  1  0.580  0.638  0.893  1.0
  O  O47  1  0.165  0.443  0.012  1.0
  O  O48  1  0.080  0.862  0.107  1.0
  O  O49  1  0.335  0.943  0.012  1.0
  O  O50  1  0.882  0.151  0.123  1.0
  O  O51  1  0.665  0.057  0.988  1.0
  O  O52  1  0.911  0.855  0.279  1.0
  O  O53  1  0.904  0.841  0.737  1.0
[/CIF]
.