The compound described by Ce2B8O15 crystallizes in the monoclinic P2/c space group. Ce(1) is bonded in a 11-coordinate geometry to one O(7), one O(8), two equivalent O(2), two equivalent O(4), two equivalent O(5), and three equivalent O(1) atoms. There are four inequivalent B sites. In the first B site, B(1) is bonded to one O(1), one O(2), one O(3), and one O(8) atom to form corner-sharing BO4 tetrahedra. In the second B site, B(2) is bonded to one O(2), one O(3), one O(4), and one O(6) atom to form corner-sharing BO4 tetrahedra. In the third B site, B(3) is bonded to one O(3), one O(5), one O(6), and one O(7) atom to form corner-sharing BO4 tetrahedra. In the fourth B site, B(4) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form corner-sharing BO4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a distorted bent 120 degrees geometry to two equivalent Ce(1), one B(2), and one B(4) atom. In the second O site, O(5) is bonded in a distorted bent 120 degrees geometry to two equivalent Ce(1), one B(3), and one B(4) atom. In the third O site, O(6) is bonded in a trigonal planar geometry to one B(2), one B(3), and one B(4) atom. In the fourth O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Ce(1), one B(3), and one B(4) atom. In the fifth O site, O(8) is bonded in a distorted bent 120 degrees geometry to two equivalent Ce(1) and two equivalent B(1) atoms. In the sixth O site, O(1) is bonded in a distorted single-bond geometry to three equivalent Ce(1) and one B(1) atom. In the seventh O site, O(2) is bonded in a bent 120 degrees geometry to two equivalent Ce(1), one B(1), and one B(2) atom. In the eighth O site, O(3) is bonded in a trigonal planar geometry to one B(1), one B(2), and one B(3) atom. is represented by the CIF file [CIF]
data_Ce2B8O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.244
_cell_length_b   9.214
_cell_length_c   12.572
_cell_angle_alpha   63.471
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   439.849
_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
  Ce  Ce0  1  0.264  0.858  0.948  1.0
  Ce  Ce1  1  0.264  0.142  0.552  1.0
  Ce  Ce2  1  0.736  0.142  0.052  1.0
  Ce  Ce3  1  0.736  0.858  0.448  1.0
  B  B4  1  0.215  0.893  0.204  1.0
  B  B5  1  0.215  0.107  0.296  1.0
  B  B6  1  0.785  0.107  0.796  1.0
  B  B7  1  0.785  0.893  0.704  1.0
  B  B8  1  0.731  0.716  0.234  1.0
  B  B9  1  0.731  0.284  0.266  1.0
  B  B10  1  0.269  0.284  0.766  1.0
  B  B11  1  0.269  0.716  0.734  1.0
  B  B12  1  0.217  0.405  0.127  1.0
  B  B13  1  0.217  0.595  0.373  1.0
  B  B14  1  0.783  0.595  0.873  1.0
  B  B15  1  0.783  0.405  0.627  1.0
  B  B16  1  0.708  0.586  0.086  1.0
  B  B17  1  0.708  0.414  0.414  1.0
  B  B18  1  0.292  0.414  0.914  1.0
  B  B19  1  0.292  0.586  0.586  1.0
  O  O20  1  0.260  0.971  0.078  1.0
  O  O21  1  0.260  0.029  0.422  1.0
  O  O22  1  0.740  0.029  0.922  1.0
  O  O23  1  0.740  0.971  0.578  1.0
  O  O24  1  0.879  0.859  0.236  1.0
  O  O25  1  0.879  0.141  0.264  1.0
  O  O26  1  0.121  0.141  0.764  1.0
  O  O27  1  0.121  0.859  0.736  1.0
  O  O28  1  0.619  0.724  0.764  1.0
  O  O29  1  0.619  0.276  0.736  1.0
  O  O30  1  0.381  0.276  0.236  1.0
  O  O31  1  0.381  0.724  0.264  1.0
  O  O32  1  0.775  0.713  0.122  1.0
  O  O33  1  0.775  0.287  0.378  1.0
  O  O34  1  0.225  0.287  0.878  1.0
  O  O35  1  0.225  0.713  0.622  1.0
  O  O36  1  0.811  0.661  0.960  1.0
  O  O37  1  0.811  0.339  0.540  1.0
  O  O38  1  0.189  0.339  0.040  1.0
  O  O39  1  0.189  0.661  0.460  1.0
  O  O40  1  0.878  0.427  0.161  1.0
  O  O41  1  0.878  0.573  0.339  1.0
  O  O42  1  0.122  0.573  0.839  1.0
  O  O43  1  0.122  0.427  0.661  1.0
  O  O44  1  0.372  0.556  0.090  1.0
  O  O45  1  0.372  0.444  0.410  1.0
  O  O46  1  0.628  0.444  0.910  1.0
  O  O47  1  0.628  0.556  0.590  1.0
  O  O48  1  0.351  0.000  0.250  1.0
  O  O49  1  0.649  0.000  0.750  1.0
[/CIF]
.
The compound described by Ce2B8O15 crystallizes in the monoclinic P2/c space group. Ce(1) is bonded in a 11-coordinate geometry to one O(7), one O(8), two equivalent O(2), two equivalent O(4), two equivalent O(5), and three equivalent O(1) atoms. There are four inequivalent B sites. In the first B site, B(1) is bonded to one O(1), one O(2), one O(3), and one O(8) atom to form corner-sharing BO4 tetrahedra. In the second B site, B(2) is bonded to one O(2), one O(3), one O(4), and one O(6) atom to form corner-sharing BO4 tetrahedra. In the third B site, B(3) is bonded to one O(3), one O(5), one O(6), and one O(7) atom to form corner-sharing BO4 tetrahedra. In the fourth B site, B(4) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form corner-sharing BO4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a distorted bent 120 degrees geometry to two equivalent Ce(1), one B(2), and one B(4) atom. In the second O site, O(5) is bonded in a distorted bent 120 degrees geometry to two equivalent Ce(1), one B(3), and one B(4) atom. In the third O site, O(6) is bonded in a trigonal planar geometry to one B(2), one B(3), and one B(4) atom. In the fourth O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Ce(1), one B(3), and one B(4) atom. In the fifth O site, O(8) is bonded in a distorted bent 120 degrees geometry to two equivalent Ce(1) and two equivalent B(1) atoms. In the sixth O site, O(1) is bonded in a distorted single-bond geometry to three equivalent Ce(1) and one B(1) atom. In the seventh O site, O(2) is bonded in a bent 120 degrees geometry to two equivalent Ce(1), one B(1), and one B(2) atom. In the eighth O site, O(3) is bonded in a trigonal planar geometry to one B(1), one B(2), and one B(3) atom. is represented by the CIF file [CIF]
data_Ce2B8O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.244
_cell_length_b   9.214
_cell_length_c   12.572
_cell_angle_alpha   63.471
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   439.849
_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
  Ce  Ce0  1  0.264  0.858  0.948  1.0
  Ce  Ce1  1  0.264  0.142  0.552  1.0
  Ce  Ce2  1  0.736  0.142  0.052  1.0
  Ce  Ce3  1  0.736  0.858  0.448  1.0
  B  B4  1  0.215  0.893  0.204  1.0
  B  B5  1  0.215  0.107  0.296  1.0
  B  B6  1  0.785  0.107  0.796  1.0
  B  B7  1  0.785  0.893  0.704  1.0
  B  B8  1  0.731  0.716  0.234  1.0
  B  B9  1  0.731  0.284  0.266  1.0
  B  B10  1  0.269  0.284  0.766  1.0
  B  B11  1  0.269  0.716  0.734  1.0
  B  B12  1  0.217  0.405  0.127  1.0
  B  B13  1  0.217  0.595  0.373  1.0
  B  B14  1  0.783  0.595  0.873  1.0
  B  B15  1  0.783  0.405  0.627  1.0
  B  B16  1  0.708  0.586  0.086  1.0
  B  B17  1  0.708  0.414  0.414  1.0
  B  B18  1  0.292  0.414  0.914  1.0
  B  B19  1  0.292  0.586  0.586  1.0
  O  O20  1  0.260  0.971  0.078  1.0
  O  O21  1  0.260  0.029  0.422  1.0
  O  O22  1  0.740  0.029  0.922  1.0
  O  O23  1  0.740  0.971  0.578  1.0
  O  O24  1  0.879  0.859  0.236  1.0
  O  O25  1  0.879  0.141  0.264  1.0
  O  O26  1  0.121  0.141  0.764  1.0
  O  O27  1  0.121  0.859  0.736  1.0
  O  O28  1  0.619  0.724  0.764  1.0
  O  O29  1  0.619  0.276  0.736  1.0
  O  O30  1  0.381  0.276  0.236  1.0
  O  O31  1  0.381  0.724  0.264  1.0
  O  O32  1  0.775  0.713  0.122  1.0
  O  O33  1  0.775  0.287  0.378  1.0
  O  O34  1  0.225  0.287  0.878  1.0
  O  O35  1  0.225  0.713  0.622  1.0
  O  O36  1  0.811  0.661  0.960  1.0
  O  O37  1  0.811  0.339  0.540  1.0
  O  O38  1  0.189  0.339  0.040  1.0
  O  O39  1  0.189  0.661  0.460  1.0
  O  O40  1  0.878  0.427  0.161  1.0
  O  O41  1  0.878  0.573  0.339  1.0
  O  O42  1  0.122  0.573  0.839  1.0
  O  O43  1  0.122  0.427  0.661  1.0
  O  O44  1  0.372  0.556  0.090  1.0
  O  O45  1  0.372  0.444  0.410  1.0
  O  O46  1  0.628  0.444  0.910  1.0
  O  O47  1  0.628  0.556  0.590  1.0
  O  O48  1  0.351  0.000  0.250  1.0
  O  O49  1  0.649  0.000  0.750  1.0
[/CIF]
.