The material described by Eu3O4 crystallizes in the orthorhombic Pnma space group. There are three inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to one O(1), two equivalent O(3), and three equivalent O(2) atoms to form a mixture of corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 52-72°. In the second Eu site, Eu(2) is bonded to one O(3), two equivalent O(1), and three equivalent O(4) atoms to form a mixture of distorted corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 52-72°. In the third Eu site, Eu(3) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Eu(1), two equivalent Eu(2), and two equivalent Eu(3) atoms to form a mixture of distorted corner and edge-sharing OEu5 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Eu(3) and three equivalent Eu(1) atoms to form a mixture of distorted corner and edge-sharing OEu5 square pyramids. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Eu(2), one Eu(3), and two equivalent Eu(1) atoms. In the fourth O site, O(4) is bonded to two equivalent Eu(3) and three equivalent Eu(2) atoms to form a mixture of distorted corner and edge-sharing OEu5 trigonal bipyramids. is represented by the CIF file [CIF]
data_Eu3O4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.492
_cell_length_b   10.134
_cell_length_c   12.282
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   434.609
_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
  Eu  Eu0  1  0.250  0.424  0.612  1.0
  Eu  Eu1  1  0.250  0.924  0.888  1.0
  Eu  Eu2  1  0.750  0.576  0.388  1.0
  Eu  Eu3  1  0.750  0.076  0.112  1.0
  Eu  Eu4  1  0.250  0.418  0.113  1.0
  Eu  Eu5  1  0.250  0.918  0.387  1.0
  Eu  Eu6  1  0.750  0.582  0.887  1.0
  Eu  Eu7  1  0.750  0.082  0.613  1.0
  Eu  Eu8  1  0.250  0.257  0.351  1.0
  Eu  Eu9  1  0.250  0.757  0.149  1.0
  Eu  Eu10  1  0.750  0.743  0.649  1.0
  Eu  Eu11  1  0.750  0.243  0.851  1.0
  O  O12  1  0.250  0.222  0.699  1.0
  O  O13  1  0.250  0.722  0.801  1.0
  O  O14  1  0.750  0.778  0.301  1.0
  O  O15  1  0.750  0.278  0.199  1.0
  O  O16  1  0.250  0.139  0.977  1.0
  O  O17  1  0.250  0.639  0.523  1.0
  O  O18  1  0.750  0.861  0.023  1.0
  O  O19  1  0.750  0.361  0.477  1.0
  O  O20  1  0.250  0.992  0.208  1.0
  O  O21  1  0.250  0.492  0.292  1.0
  O  O22  1  0.750  0.008  0.792  1.0
  O  O23  1  0.750  0.508  0.708  1.0
  O  O24  1  0.250  0.421  0.916  1.0
  O  O25  1  0.250  0.921  0.584  1.0
  O  O26  1  0.750  0.579  0.084  1.0
  O  O27  1  0.750  0.079  0.416  1.0
[/CIF]
.
The material described by Eu3O4 crystallizes in the orthorhombic Pnma space group. There are three inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to one O(1), two equivalent O(3), and three equivalent O(2) atoms to form a mixture of corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 52-72°. In the second Eu site, Eu(2) is bonded to one O(3), two equivalent O(1), and three equivalent O(4) atoms to form a mixture of distorted corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles range from 52-72°. In the third Eu site, Eu(3) is bonded in a 7-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Eu(1), two equivalent Eu(2), and two equivalent Eu(3) atoms to form a mixture of distorted corner and edge-sharing OEu5 trigonal bipyramids. In the second O site, O(2) is bonded to two equivalent Eu(3) and three equivalent Eu(1) atoms to form a mixture of distorted corner and edge-sharing OEu5 square pyramids. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Eu(2), one Eu(3), and two equivalent Eu(1) atoms. In the fourth O site, O(4) is bonded to two equivalent Eu(3) and three equivalent Eu(2) atoms to form a mixture of distorted corner and edge-sharing OEu5 trigonal bipyramids. is represented by the CIF file [CIF]
data_Eu3O4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.492
_cell_length_b   10.134
_cell_length_c   12.282
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   434.609
_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
  Eu  Eu0  1  0.250  0.424  0.612  1.0
  Eu  Eu1  1  0.250  0.924  0.888  1.0
  Eu  Eu2  1  0.750  0.576  0.388  1.0
  Eu  Eu3  1  0.750  0.076  0.112  1.0
  Eu  Eu4  1  0.250  0.418  0.113  1.0
  Eu  Eu5  1  0.250  0.918  0.387  1.0
  Eu  Eu6  1  0.750  0.582  0.887  1.0
  Eu  Eu7  1  0.750  0.082  0.613  1.0
  Eu  Eu8  1  0.250  0.257  0.351  1.0
  Eu  Eu9  1  0.250  0.757  0.149  1.0
  Eu  Eu10  1  0.750  0.743  0.649  1.0
  Eu  Eu11  1  0.750  0.243  0.851  1.0
  O  O12  1  0.250  0.222  0.699  1.0
  O  O13  1  0.250  0.722  0.801  1.0
  O  O14  1  0.750  0.778  0.301  1.0
  O  O15  1  0.750  0.278  0.199  1.0
  O  O16  1  0.250  0.139  0.977  1.0
  O  O17  1  0.250  0.639  0.523  1.0
  O  O18  1  0.750  0.861  0.023  1.0
  O  O19  1  0.750  0.361  0.477  1.0
  O  O20  1  0.250  0.992  0.208  1.0
  O  O21  1  0.250  0.492  0.292  1.0
  O  O22  1  0.750  0.008  0.792  1.0
  O  O23  1  0.750  0.508  0.708  1.0
  O  O24  1  0.250  0.421  0.916  1.0
  O  O25  1  0.250  0.921  0.584  1.0
  O  O26  1  0.750  0.579  0.084  1.0
  O  O27  1  0.750  0.079  0.416  1.0
[/CIF]
.