The crystal structure described by Eu2CuO4 crystallizes in the tetragonal I4/mmm space group. Eu(1) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. Cu(1) is bonded in a square co-planar geometry to four equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(2) is bonded to four equivalent Eu(1) and two equivalent Cu(1) atoms to form distorted OEu4Cu2 octahedra that share corners with two equivalent O(2)Eu4Cu2 octahedra, corners with twelve equivalent O(1)Eu4 tetrahedra, edges with two equivalent O(2)Eu4Cu2 octahedra, edges with two equivalent O(1)Eu4 tetrahedra, and faces with four equivalent O(2)Eu4Cu2 octahedra. The corner-sharing octahedra are not tilted. In the second O site, O(1) is bonded to four equivalent Eu(1) atoms to form OEu4 tetrahedra that share corners with twelve equivalent O(2)Eu4Cu2 octahedra, corners with four equivalent O(1)Eu4 tetrahedra, edges with two equivalent O(2)Eu4Cu2 octahedra, and edges with four equivalent O(1)Eu4 tetrahedra. The corner-sharing octahedral tilt angles range from 10-69°. is represented by the CIF file [CIF]
data_Eu2CuO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.889
_cell_length_b   3.889
_cell_length_c   6.604
_cell_angle_alpha   107.117
_cell_angle_beta   107.117
_cell_angle_gamma   89.998
_symmetry_Int_Tables_number   1
_cell_volume   90.817
_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
  Eu  Eu0  1  0.648  0.648  0.296  1.0
  Eu  Eu1  1  0.352  0.352  0.704  1.0
  Cu  Cu2  1  0.000  0.000  0.000  1.0
  O  O3  1  0.250  0.750  0.500  1.0
  O  O4  1  0.750  0.250  0.500  1.0
  O  O5  1  0.000  0.500  0.000  1.0
  O  O6  1  0.500  0.000  0.000  1.0
[/CIF]
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The crystal structure described by Eu2CuO4 crystallizes in the tetragonal I4/mmm space group. Eu(1) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. Cu(1) is bonded in a square co-planar geometry to four equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(2) is bonded to four equivalent Eu(1) and two equivalent Cu(1) atoms to form distorted OEu4Cu2 octahedra that share corners with two equivalent O(2)Eu4Cu2 octahedra, corners with twelve equivalent O(1)Eu4 tetrahedra, edges with two equivalent O(2)Eu4Cu2 octahedra, edges with two equivalent O(1)Eu4 tetrahedra, and faces with four equivalent O(2)Eu4Cu2 octahedra. The corner-sharing octahedra are not tilted. In the second O site, O(1) is bonded to four equivalent Eu(1) atoms to form OEu4 tetrahedra that share corners with twelve equivalent O(2)Eu4Cu2 octahedra, corners with four equivalent O(1)Eu4 tetrahedra, edges with two equivalent O(2)Eu4Cu2 octahedra, and edges with four equivalent O(1)Eu4 tetrahedra. The corner-sharing octahedral tilt angles range from 10-69°. is represented by the CIF file [CIF]
data_Eu2CuO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.889
_cell_length_b   3.889
_cell_length_c   6.604
_cell_angle_alpha   107.117
_cell_angle_beta   107.117
_cell_angle_gamma   89.998
_symmetry_Int_Tables_number   1
_cell_volume   90.817
_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
  Eu  Eu0  1  0.648  0.648  0.296  1.0
  Eu  Eu1  1  0.352  0.352  0.704  1.0
  Cu  Cu2  1  0.000  0.000  0.000  1.0
  O  O3  1  0.250  0.750  0.500  1.0
  O  O4  1  0.750  0.250  0.500  1.0
  O  O5  1  0.000  0.500  0.000  1.0
  O  O6  1  0.500  0.000  0.000  1.0
[/CIF]
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