The crystal structure described by Na3Eu9B8O27 crystallizes in the hexagonal P-62m space group. Na(1) is bonded in a 6-coordinate geometry to two equivalent O(4) and four equivalent O(2) atoms. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(2), two equivalent O(4), and four equivalent O(1) atoms. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), and four equivalent O(1) atoms. There are three inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to three equivalent O(4) atoms. In the second B site, B(2) is bonded in a trigonal planar geometry to three equivalent O(2) atoms. In the third B site, B(3) is bonded in a trigonal planar geometry to three equivalent O(1) atoms. There are four inequivalent O sites. In the first O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Na(1), two equivalent Eu(1), and one B(2) atom. In the second O site, O(3) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form distorted corner-sharing OEu4 trigonal pyramids. In the third O site, O(4) is bonded in a 5-coordinate geometry to one Na(1), one Eu(2), two equivalent Eu(1), and one B(1) atom. In the fourth O site, O(1) is bonded in a distorted single-bond geometry to one Eu(2), two equivalent Eu(1), and one B(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na3Eu9B8O27
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.472
_cell_length_b   8.809
_cell_length_c   8.809
_cell_angle_alpha   120.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   569.381
_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
  Na  Na0  1  0.000  0.665  0.665  1.0
  Na  Na1  1  0.000  0.000  0.335  1.0
  Na  Na2  1  0.000  0.335  0.000  1.0
  Eu  Eu3  1  0.763  0.349  0.349  1.0
  Eu  Eu4  1  0.763  0.000  0.651  1.0
  Eu  Eu5  1  0.237  0.349  0.349  1.0
  Eu  Eu6  1  0.237  0.000  0.651  1.0
  Eu  Eu7  1  0.763  0.651  0.000  1.0
  Eu  Eu8  1  0.237  0.651  0.000  1.0
  Eu  Eu9  1  0.500  0.719  0.719  1.0
  Eu  Eu10  1  0.500  0.000  0.281  1.0
  Eu  Eu11  1  0.500  0.281  0.000  1.0
  B  B12  1  0.790  0.000  0.000  1.0
  B  B13  1  0.210  0.000  0.000  1.0
  B  B14  1  0.000  0.667  0.333  1.0
  B  B15  1  0.000  0.333  0.667  1.0
  B  B16  1  0.675  0.667  0.333  1.0
  B  B17  1  0.325  0.667  0.333  1.0
  B  B18  1  0.325  0.333  0.667  1.0
  B  B19  1  0.675  0.333  0.667  1.0
  O  O20  1  0.681  0.823  0.334  1.0
  O  O21  1  0.681  0.511  0.177  1.0
  O  O22  1  0.319  0.823  0.334  1.0
  O  O23  1  0.319  0.489  0.666  1.0
  O  O24  1  0.681  0.666  0.489  1.0
  O  O25  1  0.319  0.511  0.177  1.0
  O  O26  1  0.319  0.334  0.823  1.0
  O  O27  1  0.681  0.489  0.666  1.0
  O  O28  1  0.319  0.666  0.489  1.0
  O  O29  1  0.681  0.334  0.823  1.0
  O  O30  1  0.319  0.177  0.511  1.0
  O  O31  1  0.681  0.177  0.511  1.0
  O  O32  1  0.000  0.678  0.181  1.0
  O  O33  1  0.000  0.503  0.322  1.0
  O  O34  1  0.000  0.497  0.819  1.0
  O  O35  1  0.000  0.819  0.497  1.0
  O  O36  1  0.000  0.181  0.678  1.0
  O  O37  1  0.000  0.322  0.503  1.0
  O  O38  1  0.500  0.254  0.254  1.0
  O  O39  1  0.500  0.000  0.746  1.0
  O  O40  1  0.500  0.746  0.000  1.0
  O  O41  1  0.788  0.843  0.843  1.0
  O  O42  1  0.788  0.000  0.157  1.0
  O  O43  1  0.212  0.843  0.843  1.0
  O  O44  1  0.212  0.000  0.157  1.0
  O  O45  1  0.788  0.157  0.000  1.0
  O  O46  1  0.212  0.157  0.000  1.0
[/CIF]
.
The crystal structure described by Na3Eu9B8O27 crystallizes in the hexagonal P-62m space group. Na(1) is bonded in a 6-coordinate geometry to two equivalent O(4) and four equivalent O(2) atoms. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(2), two equivalent O(4), and four equivalent O(1) atoms. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), and four equivalent O(1) atoms. There are three inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to three equivalent O(4) atoms. In the second B site, B(2) is bonded in a trigonal planar geometry to three equivalent O(2) atoms. In the third B site, B(3) is bonded in a trigonal planar geometry to three equivalent O(1) atoms. There are four inequivalent O sites. In the first O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Na(1), two equivalent Eu(1), and one B(2) atom. In the second O site, O(3) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form distorted corner-sharing OEu4 trigonal pyramids. In the third O site, O(4) is bonded in a 5-coordinate geometry to one Na(1), one Eu(2), two equivalent Eu(1), and one B(1) atom. In the fourth O site, O(1) is bonded in a distorted single-bond geometry to one Eu(2), two equivalent Eu(1), and one B(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na3Eu9B8O27
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.472
_cell_length_b   8.809
_cell_length_c   8.809
_cell_angle_alpha   120.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   569.381
_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
  Na  Na0  1  0.000  0.665  0.665  1.0
  Na  Na1  1  0.000  0.000  0.335  1.0
  Na  Na2  1  0.000  0.335  0.000  1.0
  Eu  Eu3  1  0.763  0.349  0.349  1.0
  Eu  Eu4  1  0.763  0.000  0.651  1.0
  Eu  Eu5  1  0.237  0.349  0.349  1.0
  Eu  Eu6  1  0.237  0.000  0.651  1.0
  Eu  Eu7  1  0.763  0.651  0.000  1.0
  Eu  Eu8  1  0.237  0.651  0.000  1.0
  Eu  Eu9  1  0.500  0.719  0.719  1.0
  Eu  Eu10  1  0.500  0.000  0.281  1.0
  Eu  Eu11  1  0.500  0.281  0.000  1.0
  B  B12  1  0.790  0.000  0.000  1.0
  B  B13  1  0.210  0.000  0.000  1.0
  B  B14  1  0.000  0.667  0.333  1.0
  B  B15  1  0.000  0.333  0.667  1.0
  B  B16  1  0.675  0.667  0.333  1.0
  B  B17  1  0.325  0.667  0.333  1.0
  B  B18  1  0.325  0.333  0.667  1.0
  B  B19  1  0.675  0.333  0.667  1.0
  O  O20  1  0.681  0.823  0.334  1.0
  O  O21  1  0.681  0.511  0.177  1.0
  O  O22  1  0.319  0.823  0.334  1.0
  O  O23  1  0.319  0.489  0.666  1.0
  O  O24  1  0.681  0.666  0.489  1.0
  O  O25  1  0.319  0.511  0.177  1.0
  O  O26  1  0.319  0.334  0.823  1.0
  O  O27  1  0.681  0.489  0.666  1.0
  O  O28  1  0.319  0.666  0.489  1.0
  O  O29  1  0.681  0.334  0.823  1.0
  O  O30  1  0.319  0.177  0.511  1.0
  O  O31  1  0.681  0.177  0.511  1.0
  O  O32  1  0.000  0.678  0.181  1.0
  O  O33  1  0.000  0.503  0.322  1.0
  O  O34  1  0.000  0.497  0.819  1.0
  O  O35  1  0.000  0.819  0.497  1.0
  O  O36  1  0.000  0.181  0.678  1.0
  O  O37  1  0.000  0.322  0.503  1.0
  O  O38  1  0.500  0.254  0.254  1.0
  O  O39  1  0.500  0.000  0.746  1.0
  O  O40  1  0.500  0.746  0.000  1.0
  O  O41  1  0.788  0.843  0.843  1.0
  O  O42  1  0.788  0.000  0.157  1.0
  O  O43  1  0.212  0.843  0.843  1.0
  O  O44  1  0.212  0.000  0.157  1.0
  O  O45  1  0.788  0.157  0.000  1.0
  O  O46  1  0.212  0.157  0.000  1.0
[/CIF]
.