The compound described by Sr2EuNb(CuO4)2 crystallizes in the tetragonal I4/mcm space group. Sr(1) is bonded in a distorted q6 geometry to two equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms. Eu(1) is bonded in a body-centered cubic geometry to eight equivalent O(2) atoms. Nb(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form NbO6 octahedra that share corners with four equivalent Nb(1)O6 octahedra and corners with two equivalent Cu(1)O5 square pyramids. The corner-sharing octahedral tilt angles are 31°. Cu(1) is bonded to one O(3) and four equivalent O(2) atoms to form CuO5 square pyramids that share  a cornercorner with one Nb(1)O6 octahedra and corners with four equivalent Cu(1)O5 square pyramids. The corner-sharing octahedra are not tilted. There are three inequivalent O sites. In the first O site, O(3) is bonded to four equivalent Sr(1), one Nb(1), and one Cu(1) atom to form distorted OSr4NbCu octahedra that share corners with five equivalent O(3)Sr4NbCu octahedra, corners with eight equivalent O(2)Sr2Eu2Cu2 octahedra, edges with four equivalent O(3)Sr4NbCu octahedra, and faces with four equivalent O(2)Sr2Eu2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-54°. In the second O site, O(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Sr(1) and two equivalent Nb(1) atoms. In the third O site, O(2) is bonded to two equivalent Sr(1), two equivalent Eu(1), and two equivalent Cu(1) atoms to form distorted OSr2Eu2Cu2 octahedra that share corners with four equivalent O(3)Sr4NbCu octahedra, corners with eight equivalent O(2)Sr2Eu2Cu2 octahedra, edges with three equivalent O(2)Sr2Eu2Cu2 octahedra, faces with two equivalent O(3)Sr4NbCu octahedra, and faces with four equivalent O(2)Sr2Eu2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-67°. is represented by the CIF card [CIF]
data_Sr2EuNb(CuO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.478
_cell_length_b   12.478
_cell_length_c   12.478
_cell_angle_alpha   154.470
_cell_angle_beta   154.470
_cell_angle_gamma   36.417
_symmetry_Int_Tables_number   1
_cell_volume   360.382
_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
  Sr  Sr0  1  0.600  0.100  0.500  1.0
  Sr  Sr1  1  0.400  0.900  0.500  1.0
  Sr  Sr2  1  0.100  0.600  0.500  1.0
  Sr  Sr3  1  0.900  0.400  0.500  1.0
  Eu  Eu4  1  0.250  0.750  0.500  1.0
  Eu  Eu5  1  0.750  0.250  0.500  1.0
  Nb  Nb6  1  0.500  0.500  0.000  1.0
  Nb  Nb7  1  0.000  0.000  0.000  1.0
  Cu  Cu8  1  0.678  0.678  0.000  1.0
  Cu  Cu9  1  0.822  0.822  0.000  1.0
  Cu  Cu10  1  0.322  0.322  0.000  1.0
  Cu  Cu11  1  0.178  0.178  0.000  1.0
  O  O12  1  0.681  0.819  0.500  1.0
  O  O13  1  0.819  0.319  0.139  1.0
  O  O14  1  0.181  0.681  0.861  1.0
  O  O15  1  0.319  0.181  0.500  1.0
  O  O16  1  0.936  0.933  0.500  1.0
  O  O17  1  0.064  0.067  0.500  1.0
  O  O18  1  0.567  0.564  0.500  1.0
  O  O19  1  0.564  0.064  0.997  1.0
  O  O20  1  0.067  0.567  0.003  1.0
  O  O21  1  0.933  0.433  0.997  1.0
  O  O22  1  0.436  0.936  0.003  1.0
  O  O23  1  0.433  0.436  0.500  1.0
  O  O24  1  0.084  0.084  0.000  1.0
  O  O25  1  0.416  0.416  0.000  1.0
  O  O26  1  0.916  0.916  0.000  1.0
  O  O27  1  0.584  0.584  0.000  1.0
[/CIF]
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The compound described by Sr2EuNb(CuO4)2 crystallizes in the tetragonal I4/mcm space group. Sr(1) is bonded in a distorted q6 geometry to two equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms. Eu(1) is bonded in a body-centered cubic geometry to eight equivalent O(2) atoms. Nb(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form NbO6 octahedra that share corners with four equivalent Nb(1)O6 octahedra and corners with two equivalent Cu(1)O5 square pyramids. The corner-sharing octahedral tilt angles are 31°. Cu(1) is bonded to one O(3) and four equivalent O(2) atoms to form CuO5 square pyramids that share  a cornercorner with one Nb(1)O6 octahedra and corners with four equivalent Cu(1)O5 square pyramids. The corner-sharing octahedra are not tilted. There are three inequivalent O sites. In the first O site, O(3) is bonded to four equivalent Sr(1), one Nb(1), and one Cu(1) atom to form distorted OSr4NbCu octahedra that share corners with five equivalent O(3)Sr4NbCu octahedra, corners with eight equivalent O(2)Sr2Eu2Cu2 octahedra, edges with four equivalent O(3)Sr4NbCu octahedra, and faces with four equivalent O(2)Sr2Eu2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-54°. In the second O site, O(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Sr(1) and two equivalent Nb(1) atoms. In the third O site, O(2) is bonded to two equivalent Sr(1), two equivalent Eu(1), and two equivalent Cu(1) atoms to form distorted OSr2Eu2Cu2 octahedra that share corners with four equivalent O(3)Sr4NbCu octahedra, corners with eight equivalent O(2)Sr2Eu2Cu2 octahedra, edges with three equivalent O(2)Sr2Eu2Cu2 octahedra, faces with two equivalent O(3)Sr4NbCu octahedra, and faces with four equivalent O(2)Sr2Eu2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-67°. is represented by the CIF card [CIF]
data_Sr2EuNb(CuO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.478
_cell_length_b   12.478
_cell_length_c   12.478
_cell_angle_alpha   154.470
_cell_angle_beta   154.470
_cell_angle_gamma   36.417
_symmetry_Int_Tables_number   1
_cell_volume   360.382
_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
  Sr  Sr0  1  0.600  0.100  0.500  1.0
  Sr  Sr1  1  0.400  0.900  0.500  1.0
  Sr  Sr2  1  0.100  0.600  0.500  1.0
  Sr  Sr3  1  0.900  0.400  0.500  1.0
  Eu  Eu4  1  0.250  0.750  0.500  1.0
  Eu  Eu5  1  0.750  0.250  0.500  1.0
  Nb  Nb6  1  0.500  0.500  0.000  1.0
  Nb  Nb7  1  0.000  0.000  0.000  1.0
  Cu  Cu8  1  0.678  0.678  0.000  1.0
  Cu  Cu9  1  0.822  0.822  0.000  1.0
  Cu  Cu10  1  0.322  0.322  0.000  1.0
  Cu  Cu11  1  0.178  0.178  0.000  1.0
  O  O12  1  0.681  0.819  0.500  1.0
  O  O13  1  0.819  0.319  0.139  1.0
  O  O14  1  0.181  0.681  0.861  1.0
  O  O15  1  0.319  0.181  0.500  1.0
  O  O16  1  0.936  0.933  0.500  1.0
  O  O17  1  0.064  0.067  0.500  1.0
  O  O18  1  0.567  0.564  0.500  1.0
  O  O19  1  0.564  0.064  0.997  1.0
  O  O20  1  0.067  0.567  0.003  1.0
  O  O21  1  0.933  0.433  0.997  1.0
  O  O22  1  0.436  0.936  0.003  1.0
  O  O23  1  0.433  0.436  0.500  1.0
  O  O24  1  0.084  0.084  0.000  1.0
  O  O25  1  0.416  0.416  0.000  1.0
  O  O26  1  0.916  0.916  0.000  1.0
  O  O27  1  0.584  0.584  0.000  1.0
[/CIF]
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