The crystal structure described by Ho2B4O9 crystallizes in the triclinic P-1 space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(5), one O(7), one O(9), two equivalent O(1), and two equivalent O(4) atoms. In the second Ho site, Ho(2) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(9), two equivalent O(7), and two equivalent O(8) atoms. There are four inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(6) atom. In the second B site, B(2) is bonded to one O(2), one O(3), one O(5), and one O(8) atom to form corner-sharing BO4 tetrahedra. In the third B site, B(3) is bonded to one O(4), one O(5), one O(7), and one O(9) atom to form corner-sharing BO4 tetrahedra. In the fourth B site, B(4) is bonded to one O(3), one O(6), one O(8), and one O(9) atom to form corner-sharing BO4 tetrahedra. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ho(2), two equivalent Ho(1), and one B(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Ho(1), one Ho(2), one B(1), and one B(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ho(1), one B(2), and one B(4) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Ho(2), two equivalent Ho(1), and one B(3) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ho(1), one Ho(2), one B(2), and one B(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ho(2), one B(1), and one B(4) atom. In the seventh O site, O(7) is bonded to one Ho(1), two equivalent Ho(2), and one B(3) atom to form distorted edge-sharing OHo3B tetrahedra. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to two equivalent Ho(2), one B(2), and one B(4) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Ho(1), one Ho(2), one B(3), and one B(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ho2B4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.186
_cell_length_b   6.446
_cell_length_c   7.487
_cell_angle_alpha   102.514
_cell_angle_beta   97.133
_cell_angle_gamma   102.418
_symmetry_Int_Tables_number   1
_cell_volume   279.995
_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
  Ho  Ho0  1  0.113  0.323  0.640  1.0
  Ho  Ho1  1  0.451  0.909  0.713  1.0
  Ho  Ho2  1  0.549  0.091  0.287  1.0
  Ho  Ho3  1  0.887  0.677  0.360  1.0
  B  B4  1  0.006  0.854  0.810  1.0
  B  B5  1  0.269  0.666  0.019  1.0
  B  B6  1  0.374  0.643  0.349  1.0
  B  B7  1  0.338  0.318  0.073  1.0
  B  B8  1  0.662  0.682  0.927  1.0
  B  B9  1  0.626  0.357  0.651  1.0
  B  B10  1  0.731  0.334  0.981  1.0
  B  B11  1  0.994  0.146  0.190  1.0
  O  O12  1  0.069  0.956  0.675  1.0
  O  O13  1  0.140  0.718  0.856  1.0
  O  O14  1  0.226  0.428  0.958  1.0
  O  O15  1  0.219  0.595  0.478  1.0
  O  O16  1  0.236  0.737  0.211  1.0
  O  O17  1  0.188  0.132  0.121  1.0
  O  O18  1  0.420  0.182  0.555  1.0
  O  O19  1  0.495  0.209  0.979  1.0
  O  O20  1  0.540  0.538  0.748  1.0
  O  O21  1  0.460  0.462  0.252  1.0
  O  O22  1  0.505  0.791  0.021  1.0
  O  O23  1  0.580  0.818  0.445  1.0
  O  O24  1  0.812  0.868  0.879  1.0
  O  O25  1  0.764  0.263  0.789  1.0
  O  O26  1  0.781  0.405  0.522  1.0
  O  O27  1  0.774  0.572  0.042  1.0
  O  O28  1  0.860  0.282  0.144  1.0
  O  O29  1  0.931  0.044  0.325  1.0
[/CIF]
.
The crystal structure described by Ho2B4O9 crystallizes in the triclinic P-1 space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(5), one O(7), one O(9), two equivalent O(1), and two equivalent O(4) atoms. In the second Ho site, Ho(2) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(9), two equivalent O(7), and two equivalent O(8) atoms. There are four inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(6) atom. In the second B site, B(2) is bonded to one O(2), one O(3), one O(5), and one O(8) atom to form corner-sharing BO4 tetrahedra. In the third B site, B(3) is bonded to one O(4), one O(5), one O(7), and one O(9) atom to form corner-sharing BO4 tetrahedra. In the fourth B site, B(4) is bonded to one O(3), one O(6), one O(8), and one O(9) atom to form corner-sharing BO4 tetrahedra. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ho(2), two equivalent Ho(1), and one B(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Ho(1), one Ho(2), one B(1), and one B(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Ho(1), one B(2), and one B(4) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Ho(2), two equivalent Ho(1), and one B(3) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ho(1), one Ho(2), one B(2), and one B(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ho(2), one B(1), and one B(4) atom. In the seventh O site, O(7) is bonded to one Ho(1), two equivalent Ho(2), and one B(3) atom to form distorted edge-sharing OHo3B tetrahedra. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to two equivalent Ho(2), one B(2), and one B(4) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Ho(1), one Ho(2), one B(3), and one B(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ho2B4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.186
_cell_length_b   6.446
_cell_length_c   7.487
_cell_angle_alpha   102.514
_cell_angle_beta   97.133
_cell_angle_gamma   102.418
_symmetry_Int_Tables_number   1
_cell_volume   279.995
_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
  Ho  Ho0  1  0.113  0.323  0.640  1.0
  Ho  Ho1  1  0.451  0.909  0.713  1.0
  Ho  Ho2  1  0.549  0.091  0.287  1.0
  Ho  Ho3  1  0.887  0.677  0.360  1.0
  B  B4  1  0.006  0.854  0.810  1.0
  B  B5  1  0.269  0.666  0.019  1.0
  B  B6  1  0.374  0.643  0.349  1.0
  B  B7  1  0.338  0.318  0.073  1.0
  B  B8  1  0.662  0.682  0.927  1.0
  B  B9  1  0.626  0.357  0.651  1.0
  B  B10  1  0.731  0.334  0.981  1.0
  B  B11  1  0.994  0.146  0.190  1.0
  O  O12  1  0.069  0.956  0.675  1.0
  O  O13  1  0.140  0.718  0.856  1.0
  O  O14  1  0.226  0.428  0.958  1.0
  O  O15  1  0.219  0.595  0.478  1.0
  O  O16  1  0.236  0.737  0.211  1.0
  O  O17  1  0.188  0.132  0.121  1.0
  O  O18  1  0.420  0.182  0.555  1.0
  O  O19  1  0.495  0.209  0.979  1.0
  O  O20  1  0.540  0.538  0.748  1.0
  O  O21  1  0.460  0.462  0.252  1.0
  O  O22  1  0.505  0.791  0.021  1.0
  O  O23  1  0.580  0.818  0.445  1.0
  O  O24  1  0.812  0.868  0.879  1.0
  O  O25  1  0.764  0.263  0.789  1.0
  O  O26  1  0.781  0.405  0.522  1.0
  O  O27  1  0.774  0.572  0.042  1.0
  O  O28  1  0.860  0.282  0.144  1.0
  O  O29  1  0.931  0.044  0.325  1.0
[/CIF]
.