The material described by Eu2Ru2O7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to two equivalent O(3), two equivalent O(4), and four equivalent O(1) atoms to form distorted EuO8 hexagonal bipyramids that share edges with two equivalent Eu(1)O8 hexagonal bipyramids, edges with four equivalent Eu(2)O8 hexagonal bipyramids, edges with two equivalent Ru(2)O6 octahedra, and edges with four equivalent Ru(1)O6 octahedra. In the second Eu site, Eu(2) is bonded to two equivalent O(2), two equivalent O(4), and four equivalent O(1) atoms to form distorted EuO8 hexagonal bipyramids that share edges with two equivalent Eu(2)O8 hexagonal bipyramids, edges with four equivalent Eu(1)O8 hexagonal bipyramids, edges with two equivalent Ru(1)O6 octahedra, and edges with four equivalent Ru(2)O6 octahedra. There are two inequivalent Ru sites. In the first Ru site, Ru(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form RuO6 octahedra that share corners with two equivalent Ru(1)O6 octahedra, corners with four equivalent Ru(2)O6 octahedra, edges with two equivalent Eu(2)O8 hexagonal bipyramids, and edges with four equivalent Eu(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 46-49°. In the second Ru site, Ru(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form RuO6 octahedra that share corners with two equivalent Ru(2)O6 octahedra, corners with four equivalent Ru(1)O6 octahedra, edges with two equivalent Eu(1)O8 hexagonal bipyramids, and edges with four equivalent Eu(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 46°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Eu(1), one Eu(2), one Ru(1), and one Ru(2) atom to form distorted OEu2Ru2 tetrahedra that share corners with two equivalent O(2)Eu2Ru2 tetrahedra, corners with two equivalent O(3)Eu2Ru2 tetrahedra, corners with two equivalent O(4)Eu4 tetrahedra, corners with eight equivalent O(1)Eu2Ru2 tetrahedra,  an edgeedge with one O(2)Eu2Ru2 tetrahedra,  an edgeedge with one O(3)Eu2Ru2 tetrahedra,  an edgeedge with one O(4)Eu4 tetrahedra, and edges with two equivalent O(1)Eu2Ru2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Eu(2) and two equivalent Ru(2) atoms to form distorted OEu2Ru2 tetrahedra that share corners with two equivalent O(4)Eu4 tetrahedra, corners with four equivalent O(2)Eu2Ru2 tetrahedra, corners with eight equivalent O(1)Eu2Ru2 tetrahedra,  an edgeedge with one O(4)Eu4 tetrahedra, and edges with four equivalent O(1)Eu2Ru2 tetrahedra. In the third O site, O(3) is bonded to two equivalent Eu(1) and two equivalent Ru(1) atoms to form distorted OEu2Ru2 tetrahedra that share corners with two equivalent O(4)Eu4 tetrahedra, corners with four equivalent O(3)Eu2Ru2 tetrahedra, corners with eight equivalent O(1)Eu2Ru2 tetrahedra,  an edgeedge with one O(4)Eu4 tetrahedra, and edges with four equivalent O(1)Eu2Ru2 tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form OEu4 tetrahedra that share corners with two equivalent O(2)Eu2Ru2 tetrahedra, corners with two equivalent O(3)Eu2Ru2 tetrahedra, corners with four equivalent O(4)Eu4 tetrahedra, corners with eight equivalent O(1)Eu2Ru2 tetrahedra,  an edgeedge with one O(2)Eu2Ru2 tetrahedra,  an edgeedge with one O(3)Eu2Ru2 tetrahedra, and edges with four equivalent O(1)Eu2Ru2 tetrahedra. is represented by the CIF file [CIF]
data_Eu2Ru2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.296
_cell_length_b   7.277
_cell_length_c   7.296
_cell_angle_alpha   60.085
_cell_angle_beta   60.253
_cell_angle_gamma   60.087
_symmetry_Int_Tables_number   1
_cell_volume   274.763
_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
  Eu  Eu0  1  0.625  0.625  0.125  1.0
  Eu  Eu1  1  0.625  0.625  0.625  1.0
  Eu  Eu2  1  0.125  0.625  0.625  1.0
  Eu  Eu3  1  0.625  0.125  0.625  1.0
  Ru  Ru4  1  0.125  0.125  0.125  1.0
  Ru  Ru5  1  0.625  0.125  0.125  1.0
  Ru  Ru6  1  0.125  0.625  0.125  1.0
  Ru  Ru7  1  0.125  0.125  0.625  1.0
  O  O8  1  0.451  0.051  0.047  1.0
  O  O9  1  0.799  0.800  0.203  1.0
  O  O10  1  0.450  0.050  0.450  1.0
  O  O11  1  0.203  0.800  0.799  1.0
  O  O12  1  0.047  0.051  0.451  1.0
  O  O13  1  0.044  0.456  0.044  1.0
  O  O14  1  0.047  0.450  0.451  1.0
  O  O15  1  0.750  0.750  0.750  1.0
  O  O16  1  0.799  0.199  0.203  1.0
  O  O17  1  0.206  0.794  0.206  1.0
  O  O18  1  0.500  0.500  0.500  1.0
  O  O19  1  0.451  0.450  0.047  1.0
  O  O20  1  0.800  0.200  0.800  1.0
  O  O21  1  0.203  0.199  0.799  1.0
[/CIF]
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The material described by Eu2Ru2O7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to two equivalent O(3), two equivalent O(4), and four equivalent O(1) atoms to form distorted EuO8 hexagonal bipyramids that share edges with two equivalent Eu(1)O8 hexagonal bipyramids, edges with four equivalent Eu(2)O8 hexagonal bipyramids, edges with two equivalent Ru(2)O6 octahedra, and edges with four equivalent Ru(1)O6 octahedra. In the second Eu site, Eu(2) is bonded to two equivalent O(2), two equivalent O(4), and four equivalent O(1) atoms to form distorted EuO8 hexagonal bipyramids that share edges with two equivalent Eu(2)O8 hexagonal bipyramids, edges with four equivalent Eu(1)O8 hexagonal bipyramids, edges with two equivalent Ru(1)O6 octahedra, and edges with four equivalent Ru(2)O6 octahedra. There are two inequivalent Ru sites. In the first Ru site, Ru(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form RuO6 octahedra that share corners with two equivalent Ru(1)O6 octahedra, corners with four equivalent Ru(2)O6 octahedra, edges with two equivalent Eu(2)O8 hexagonal bipyramids, and edges with four equivalent Eu(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 46-49°. In the second Ru site, Ru(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form RuO6 octahedra that share corners with two equivalent Ru(2)O6 octahedra, corners with four equivalent Ru(1)O6 octahedra, edges with two equivalent Eu(1)O8 hexagonal bipyramids, and edges with four equivalent Eu(2)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 46°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Eu(1), one Eu(2), one Ru(1), and one Ru(2) atom to form distorted OEu2Ru2 tetrahedra that share corners with two equivalent O(2)Eu2Ru2 tetrahedra, corners with two equivalent O(3)Eu2Ru2 tetrahedra, corners with two equivalent O(4)Eu4 tetrahedra, corners with eight equivalent O(1)Eu2Ru2 tetrahedra,  an edgeedge with one O(2)Eu2Ru2 tetrahedra,  an edgeedge with one O(3)Eu2Ru2 tetrahedra,  an edgeedge with one O(4)Eu4 tetrahedra, and edges with two equivalent O(1)Eu2Ru2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Eu(2) and two equivalent Ru(2) atoms to form distorted OEu2Ru2 tetrahedra that share corners with two equivalent O(4)Eu4 tetrahedra, corners with four equivalent O(2)Eu2Ru2 tetrahedra, corners with eight equivalent O(1)Eu2Ru2 tetrahedra,  an edgeedge with one O(4)Eu4 tetrahedra, and edges with four equivalent O(1)Eu2Ru2 tetrahedra. In the third O site, O(3) is bonded to two equivalent Eu(1) and two equivalent Ru(1) atoms to form distorted OEu2Ru2 tetrahedra that share corners with two equivalent O(4)Eu4 tetrahedra, corners with four equivalent O(3)Eu2Ru2 tetrahedra, corners with eight equivalent O(1)Eu2Ru2 tetrahedra,  an edgeedge with one O(4)Eu4 tetrahedra, and edges with four equivalent O(1)Eu2Ru2 tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Eu(1) and two equivalent Eu(2) atoms to form OEu4 tetrahedra that share corners with two equivalent O(2)Eu2Ru2 tetrahedra, corners with two equivalent O(3)Eu2Ru2 tetrahedra, corners with four equivalent O(4)Eu4 tetrahedra, corners with eight equivalent O(1)Eu2Ru2 tetrahedra,  an edgeedge with one O(2)Eu2Ru2 tetrahedra,  an edgeedge with one O(3)Eu2Ru2 tetrahedra, and edges with four equivalent O(1)Eu2Ru2 tetrahedra. is represented by the CIF file [CIF]
data_Eu2Ru2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.296
_cell_length_b   7.277
_cell_length_c   7.296
_cell_angle_alpha   60.085
_cell_angle_beta   60.253
_cell_angle_gamma   60.087
_symmetry_Int_Tables_number   1
_cell_volume   274.763
_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
  Eu  Eu0  1  0.625  0.625  0.125  1.0
  Eu  Eu1  1  0.625  0.625  0.625  1.0
  Eu  Eu2  1  0.125  0.625  0.625  1.0
  Eu  Eu3  1  0.625  0.125  0.625  1.0
  Ru  Ru4  1  0.125  0.125  0.125  1.0
  Ru  Ru5  1  0.625  0.125  0.125  1.0
  Ru  Ru6  1  0.125  0.625  0.125  1.0
  Ru  Ru7  1  0.125  0.125  0.625  1.0
  O  O8  1  0.451  0.051  0.047  1.0
  O  O9  1  0.799  0.800  0.203  1.0
  O  O10  1  0.450  0.050  0.450  1.0
  O  O11  1  0.203  0.800  0.799  1.0
  O  O12  1  0.047  0.051  0.451  1.0
  O  O13  1  0.044  0.456  0.044  1.0
  O  O14  1  0.047  0.450  0.451  1.0
  O  O15  1  0.750  0.750  0.750  1.0
  O  O16  1  0.799  0.199  0.203  1.0
  O  O17  1  0.206  0.794  0.206  1.0
  O  O18  1  0.500  0.500  0.500  1.0
  O  O19  1  0.451  0.450  0.047  1.0
  O  O20  1  0.800  0.200  0.800  1.0
  O  O21  1  0.203  0.199  0.799  1.0
[/CIF]
.