The material described by SrEuSmNbO6 is Orthorhombic Perovskite-derived structured and crystallizes in the orthorhombic P222 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a distorted square co-planar geometry to four equivalent O(1) and four equivalent O(5) atoms. In the second Sr site, Sr(2) is bonded in a distorted square co-planar geometry to four equivalent O(3) and four equivalent O(4) atoms. In the third Sr site, Sr(3) is bonded in a distorted square co-planar geometry to four equivalent O(3) and four equivalent O(5) atoms. In the fourth Sr site, Sr(4) is bonded in a distorted square co-planar geometry to four equivalent O(1) and four equivalent O(6) atoms. There are four inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a distorted square co-planar geometry to four equivalent O(6) atoms. In the second Eu site, Eu(2) is bonded in a distorted square co-planar geometry to four equivalent O(2) atoms. In the third Eu site, Eu(3) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form EuO12 cuboctahedra that share faces with four equivalent Sm(1)O6 octahedra and faces with four equivalent Nb(1)O6 octahedra. In the fourth Eu site, Eu(4) is bonded to four equivalent O(4), four equivalent O(5), and four equivalent O(6) atoms to form EuO12 cuboctahedra that share faces with four equivalent Sm(1)O6 octahedra and faces with four equivalent Nb(1)O6 octahedra. Sm(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 SmO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra,  a faceface with one Eu(3)O12 cuboctahedra, and  a faceface with one Eu(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 27-28°. 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 Sm(1)O6 octahedra,  a faceface with one Eu(3)O12 cuboctahedra, and  a faceface with one Eu(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 27-28°. There are six inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(3), one Eu(4), one Sm(1), and one Nb(1) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Sr(4), one Eu(1), one Eu(4), one Sm(1), and one Nb(1) atom. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(4), one Eu(3), one Sm(1), and one Nb(1) atom. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to one Eu(2), one Eu(3), one Sm(1), and one Nb(1) atom. In the fifth O site, O(3) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(3), one Eu(3), one Sm(1), and one Nb(1) atom. In the sixth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(2), one Eu(4), one Sm(1), and one Nb(1) atom. is represented by the CIF file [CIF]
data_SrSmEuNbO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.478
_cell_length_b   8.484
_cell_length_c   8.482
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   610.090
_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
  Sr  Sr0  1  0.000  0.500  0.500  1.0
  Sr  Sr1  1  0.500  0.500  0.000  1.0
  Sr  Sr2  1  0.000  0.500  0.000  1.0
  Sr  Sr3  1  0.000  0.000  0.500  1.0
  Sm  Sm4  1  0.250  0.250  0.250  1.0
  Sm  Sm5  1  0.750  0.750  0.250  1.0
  Sm  Sm6  1  0.750  0.250  0.750  1.0
  Sm  Sm7  1  0.250  0.750  0.750  1.0
  Eu  Eu8  1  0.500  0.000  0.500  1.0
  Eu  Eu9  1  0.500  0.000  0.000  1.0
  Eu  Eu10  1  0.000  0.000  0.000  1.0
  Eu  Eu11  1  0.500  0.500  0.500  1.0
  Nb  Nb12  1  0.749  0.750  0.750  1.0
  Nb  Nb13  1  0.251  0.250  0.750  1.0
  Nb  Nb14  1  0.251  0.750  0.250  1.0
  Nb  Nb15  1  0.749  0.250  0.250  1.0
  O  O16  1  0.983  0.204  0.287  1.0
  O  O17  1  0.017  0.796  0.287  1.0
  O  O18  1  0.017  0.204  0.713  1.0
  O  O19  1  0.983  0.796  0.713  1.0
  O  O20  1  0.289  0.983  0.202  1.0
  O  O21  1  0.289  0.017  0.798  1.0
  O  O22  1  0.711  0.017  0.202  1.0
  O  O23  1  0.711  0.983  0.798  1.0
  O  O24  1  0.204  0.287  0.983  1.0
  O  O25  1  0.796  0.287  0.017  1.0
  O  O26  1  0.204  0.713  0.017  1.0
  O  O27  1  0.796  0.713  0.983  1.0
  O  O28  1  0.517  0.296  0.213  1.0
  O  O29  1  0.483  0.704  0.213  1.0
  O  O30  1  0.483  0.296  0.787  1.0
  O  O31  1  0.517  0.704  0.787  1.0
  O  O32  1  0.214  0.517  0.296  1.0
  O  O33  1  0.214  0.483  0.704  1.0
  O  O34  1  0.786  0.483  0.296  1.0
  O  O35  1  0.786  0.517  0.704  1.0
  O  O36  1  0.298  0.211  0.517  1.0
  O  O37  1  0.702  0.211  0.483  1.0
  O  O38  1  0.298  0.789  0.483  1.0
  O  O39  1  0.702  0.789  0.517  1.0
[/CIF]
.
The material described by SrEuSmNbO6 is Orthorhombic Perovskite-derived structured and crystallizes in the orthorhombic P222 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a distorted square co-planar geometry to four equivalent O(1) and four equivalent O(5) atoms. In the second Sr site, Sr(2) is bonded in a distorted square co-planar geometry to four equivalent O(3) and four equivalent O(4) atoms. In the third Sr site, Sr(3) is bonded in a distorted square co-planar geometry to four equivalent O(3) and four equivalent O(5) atoms. In the fourth Sr site, Sr(4) is bonded in a distorted square co-planar geometry to four equivalent O(1) and four equivalent O(6) atoms. There are four inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a distorted square co-planar geometry to four equivalent O(6) atoms. In the second Eu site, Eu(2) is bonded in a distorted square co-planar geometry to four equivalent O(2) atoms. In the third Eu site, Eu(3) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form EuO12 cuboctahedra that share faces with four equivalent Sm(1)O6 octahedra and faces with four equivalent Nb(1)O6 octahedra. In the fourth Eu site, Eu(4) is bonded to four equivalent O(4), four equivalent O(5), and four equivalent O(6) atoms to form EuO12 cuboctahedra that share faces with four equivalent Sm(1)O6 octahedra and faces with four equivalent Nb(1)O6 octahedra. Sm(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 SmO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra,  a faceface with one Eu(3)O12 cuboctahedra, and  a faceface with one Eu(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 27-28°. 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 Sm(1)O6 octahedra,  a faceface with one Eu(3)O12 cuboctahedra, and  a faceface with one Eu(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 27-28°. There are six inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(3), one Eu(4), one Sm(1), and one Nb(1) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Sr(4), one Eu(1), one Eu(4), one Sm(1), and one Nb(1) atom. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(4), one Eu(3), one Sm(1), and one Nb(1) atom. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to one Eu(2), one Eu(3), one Sm(1), and one Nb(1) atom. In the fifth O site, O(3) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(3), one Eu(3), one Sm(1), and one Nb(1) atom. In the sixth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(2), one Eu(4), one Sm(1), and one Nb(1) atom. is represented by the CIF file [CIF]
data_SrSmEuNbO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.478
_cell_length_b   8.484
_cell_length_c   8.482
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   610.090
_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
  Sr  Sr0  1  0.000  0.500  0.500  1.0
  Sr  Sr1  1  0.500  0.500  0.000  1.0
  Sr  Sr2  1  0.000  0.500  0.000  1.0
  Sr  Sr3  1  0.000  0.000  0.500  1.0
  Sm  Sm4  1  0.250  0.250  0.250  1.0
  Sm  Sm5  1  0.750  0.750  0.250  1.0
  Sm  Sm6  1  0.750  0.250  0.750  1.0
  Sm  Sm7  1  0.250  0.750  0.750  1.0
  Eu  Eu8  1  0.500  0.000  0.500  1.0
  Eu  Eu9  1  0.500  0.000  0.000  1.0
  Eu  Eu10  1  0.000  0.000  0.000  1.0
  Eu  Eu11  1  0.500  0.500  0.500  1.0
  Nb  Nb12  1  0.749  0.750  0.750  1.0
  Nb  Nb13  1  0.251  0.250  0.750  1.0
  Nb  Nb14  1  0.251  0.750  0.250  1.0
  Nb  Nb15  1  0.749  0.250  0.250  1.0
  O  O16  1  0.983  0.204  0.287  1.0
  O  O17  1  0.017  0.796  0.287  1.0
  O  O18  1  0.017  0.204  0.713  1.0
  O  O19  1  0.983  0.796  0.713  1.0
  O  O20  1  0.289  0.983  0.202  1.0
  O  O21  1  0.289  0.017  0.798  1.0
  O  O22  1  0.711  0.017  0.202  1.0
  O  O23  1  0.711  0.983  0.798  1.0
  O  O24  1  0.204  0.287  0.983  1.0
  O  O25  1  0.796  0.287  0.017  1.0
  O  O26  1  0.204  0.713  0.017  1.0
  O  O27  1  0.796  0.713  0.983  1.0
  O  O28  1  0.517  0.296  0.213  1.0
  O  O29  1  0.483  0.704  0.213  1.0
  O  O30  1  0.483  0.296  0.787  1.0
  O  O31  1  0.517  0.704  0.787  1.0
  O  O32  1  0.214  0.517  0.296  1.0
  O  O33  1  0.214  0.483  0.704  1.0
  O  O34  1  0.786  0.483  0.296  1.0
  O  O35  1  0.786  0.517  0.704  1.0
  O  O36  1  0.298  0.211  0.517  1.0
  O  O37  1  0.702  0.211  0.483  1.0
  O  O38  1  0.298  0.789  0.483  1.0
  O  O39  1  0.702  0.789  0.517  1.0
[/CIF]
.