The crystal structure described by BaEuNbBiO6 crystallizes in the orthorhombic P222 space group. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form BaO12 cuboctahedra that share faces with four equivalent Nb(1)O6 octahedra and faces with four equivalent Bi(1)O6 octahedra. In the second Ba site, Ba(2) is bonded to four equivalent O(4), four equivalent O(5), and four equivalent O(6) atoms to form BaO12 cuboctahedra that share faces with four equivalent Nb(1)O6 octahedra and faces with four equivalent Bi(1)O6 octahedra. In the third Ba site, Ba(3) is bonded in a 4-coordinate geometry to four equivalent O(2) and four equivalent O(6) atoms. In the fourth Ba site, Ba(4) is bonded in a 8-coordinate geometry to four equivalent O(3) and four equivalent O(4) atoms. There are four inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a distorted rectangular see-saw-like geometry to four equivalent O(5) atoms. In the second Eu site, Eu(2) is bonded in a distorted square co-planar geometry to four equivalent O(2) and four equivalent O(4) atoms. In the third Eu site, Eu(3) is bonded in a distorted square co-planar geometry to four equivalent O(3) atoms. In the fourth Eu site, Eu(4) is bonded in a distorted body-centered cubic geometry to four equivalent O(1) and four equivalent O(6) atoms. Nb(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form NbO6 octahedra that share corners with six equivalent Bi(1)O6 octahedra,  a faceface with one Ba(1)O12 cuboctahedra, and  a faceface with one Ba(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 19-30°. Bi(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form BiO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra,  a faceface with one Ba(1)O12 cuboctahedra, and  a faceface with one Ba(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 19-30°. There are six inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one Ba(2), one Eu(1), one Nb(1), and one Bi(1) atom. In the second O site, O(6) is bonded in a 5-coordinate geometry to one Ba(2), one Ba(3), one Eu(4), one Nb(1), and one Bi(1) atom. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Ba(1), one Eu(4), one Nb(1), and one Bi(1) atom. In the fourth O site, O(2) is bonded in a 5-coordinate geometry to one Ba(1), one Ba(3), one Eu(2), one Nb(1), and one Bi(1) atom. In the fifth O site, O(3) is bonded in a 5-coordinate geometry to one Ba(1), one Ba(4), one Eu(3), one Nb(1), and one Bi(1) atom. In the sixth O site, O(4) is bonded in a 1-coordinate geometry to one Ba(2), one Ba(4), one Eu(2), one Nb(1), and one Bi(1) atom. is represented by the CIF card [CIF]
data_BaEuNbBiO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.609
_cell_length_b   8.570
_cell_length_c   8.621
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   636.064
_cell_formula_units_Z   4
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
  Ba  Ba0  1  0.000  0.000  0.000  1.0
  Ba  Ba1  1  0.500  0.500  0.500  1.0
  Ba  Ba2  1  0.500  0.000  0.500  1.0
  Ba  Ba3  1  0.500  0.500  0.000  1.0
  Eu  Eu4  1  0.000  0.500  0.500  1.0
  Eu  Eu5  1  0.500  0.000  0.000  1.0
  Eu  Eu6  1  0.000  0.500  0.000  1.0
  Eu  Eu7  1  0.000  0.000  0.500  1.0
  Nb  Nb8  1  0.245  0.249  0.249  1.0
  Nb  Nb9  1  0.755  0.751  0.249  1.0
  Nb  Nb10  1  0.755  0.249  0.751  1.0
  Nb  Nb11  1  0.245  0.751  0.751  1.0
  Bi  Bi12  1  0.758  0.749  0.748  1.0
  Bi  Bi13  1  0.242  0.251  0.748  1.0
  Bi  Bi14  1  0.242  0.749  0.252  1.0
  Bi  Bi15  1  0.758  0.251  0.252  1.0
  O  O16  1  0.014  0.197  0.290  1.0
  O  O17  1  0.986  0.803  0.290  1.0
  O  O18  1  0.986  0.197  0.710  1.0
  O  O19  1  0.014  0.803  0.710  1.0
  O  O20  1  0.286  0.022  0.200  1.0
  O  O21  1  0.286  0.978  0.800  1.0
  O  O22  1  0.714  0.978  0.200  1.0
  O  O23  1  0.714  0.022  0.800  1.0
  O  O24  1  0.198  0.295  0.025  1.0
  O  O25  1  0.802  0.295  0.975  1.0
  O  O26  1  0.198  0.705  0.975  1.0
  O  O27  1  0.802  0.705  0.025  1.0
  O  O28  1  0.474  0.285  0.228  1.0
  O  O29  1  0.526  0.715  0.228  1.0
  O  O30  1  0.526  0.285  0.772  1.0
  O  O31  1  0.474  0.715  0.772  1.0
  O  O32  1  0.203  0.482  0.293  1.0
  O  O33  1  0.203  0.518  0.707  1.0
  O  O34  1  0.797  0.518  0.293  1.0
  O  O35  1  0.797  0.482  0.707  1.0
  O  O36  1  0.273  0.218  0.486  1.0
  O  O37  1  0.727  0.218  0.514  1.0
  O  O38  1  0.273  0.782  0.514  1.0
  O  O39  1  0.727  0.782  0.486  1.0
[/CIF]
.
The crystal structure described by BaEuNbBiO6 crystallizes in the orthorhombic P222 space group. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form BaO12 cuboctahedra that share faces with four equivalent Nb(1)O6 octahedra and faces with four equivalent Bi(1)O6 octahedra. In the second Ba site, Ba(2) is bonded to four equivalent O(4), four equivalent O(5), and four equivalent O(6) atoms to form BaO12 cuboctahedra that share faces with four equivalent Nb(1)O6 octahedra and faces with four equivalent Bi(1)O6 octahedra. In the third Ba site, Ba(3) is bonded in a 4-coordinate geometry to four equivalent O(2) and four equivalent O(6) atoms. In the fourth Ba site, Ba(4) is bonded in a 8-coordinate geometry to four equivalent O(3) and four equivalent O(4) atoms. There are four inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a distorted rectangular see-saw-like geometry to four equivalent O(5) atoms. In the second Eu site, Eu(2) is bonded in a distorted square co-planar geometry to four equivalent O(2) and four equivalent O(4) atoms. In the third Eu site, Eu(3) is bonded in a distorted square co-planar geometry to four equivalent O(3) atoms. In the fourth Eu site, Eu(4) is bonded in a distorted body-centered cubic geometry to four equivalent O(1) and four equivalent O(6) atoms. Nb(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form NbO6 octahedra that share corners with six equivalent Bi(1)O6 octahedra,  a faceface with one Ba(1)O12 cuboctahedra, and  a faceface with one Ba(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 19-30°. Bi(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form BiO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra,  a faceface with one Ba(1)O12 cuboctahedra, and  a faceface with one Ba(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 19-30°. There are six inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one Ba(2), one Eu(1), one Nb(1), and one Bi(1) atom. In the second O site, O(6) is bonded in a 5-coordinate geometry to one Ba(2), one Ba(3), one Eu(4), one Nb(1), and one Bi(1) atom. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Ba(1), one Eu(4), one Nb(1), and one Bi(1) atom. In the fourth O site, O(2) is bonded in a 5-coordinate geometry to one Ba(1), one Ba(3), one Eu(2), one Nb(1), and one Bi(1) atom. In the fifth O site, O(3) is bonded in a 5-coordinate geometry to one Ba(1), one Ba(4), one Eu(3), one Nb(1), and one Bi(1) atom. In the sixth O site, O(4) is bonded in a 1-coordinate geometry to one Ba(2), one Ba(4), one Eu(2), one Nb(1), and one Bi(1) atom. is represented by the CIF card [CIF]
data_BaEuNbBiO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.609
_cell_length_b   8.570
_cell_length_c   8.621
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   636.064
_cell_formula_units_Z   4
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
  Ba  Ba0  1  0.000  0.000  0.000  1.0
  Ba  Ba1  1  0.500  0.500  0.500  1.0
  Ba  Ba2  1  0.500  0.000  0.500  1.0
  Ba  Ba3  1  0.500  0.500  0.000  1.0
  Eu  Eu4  1  0.000  0.500  0.500  1.0
  Eu  Eu5  1  0.500  0.000  0.000  1.0
  Eu  Eu6  1  0.000  0.500  0.000  1.0
  Eu  Eu7  1  0.000  0.000  0.500  1.0
  Nb  Nb8  1  0.245  0.249  0.249  1.0
  Nb  Nb9  1  0.755  0.751  0.249  1.0
  Nb  Nb10  1  0.755  0.249  0.751  1.0
  Nb  Nb11  1  0.245  0.751  0.751  1.0
  Bi  Bi12  1  0.758  0.749  0.748  1.0
  Bi  Bi13  1  0.242  0.251  0.748  1.0
  Bi  Bi14  1  0.242  0.749  0.252  1.0
  Bi  Bi15  1  0.758  0.251  0.252  1.0
  O  O16  1  0.014  0.197  0.290  1.0
  O  O17  1  0.986  0.803  0.290  1.0
  O  O18  1  0.986  0.197  0.710  1.0
  O  O19  1  0.014  0.803  0.710  1.0
  O  O20  1  0.286  0.022  0.200  1.0
  O  O21  1  0.286  0.978  0.800  1.0
  O  O22  1  0.714  0.978  0.200  1.0
  O  O23  1  0.714  0.022  0.800  1.0
  O  O24  1  0.198  0.295  0.025  1.0
  O  O25  1  0.802  0.295  0.975  1.0
  O  O26  1  0.198  0.705  0.975  1.0
  O  O27  1  0.802  0.705  0.025  1.0
  O  O28  1  0.474  0.285  0.228  1.0
  O  O29  1  0.526  0.715  0.228  1.0
  O  O30  1  0.526  0.285  0.772  1.0
  O  O31  1  0.474  0.715  0.772  1.0
  O  O32  1  0.203  0.482  0.293  1.0
  O  O33  1  0.203  0.518  0.707  1.0
  O  O34  1  0.797  0.518  0.293  1.0
  O  O35  1  0.797  0.482  0.707  1.0
  O  O36  1  0.273  0.218  0.486  1.0
  O  O37  1  0.727  0.218  0.514  1.0
  O  O38  1  0.273  0.782  0.514  1.0
  O  O39  1  0.727  0.782  0.486  1.0
[/CIF]
.