The crystal structure described by Eu2Zr2O7 crystallizes in the orthorhombic Pmma space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to two equivalent O(5) and four equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles are 71°. In the second Eu site, Eu(2) is bonded in a distorted hexagonal planar geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent Zr sites. In the first Zr site, Zr(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. In the second Zr site, Zr(2) is bonded in a body-centered cubic geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(4) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Eu(2), two equivalent Eu(1), and one Zr(1) atom to form OEu3Zr tetrahedra that share corners with two equivalent O(3)Eu2Zr2 tetrahedra, corners with two equivalent O(5)Eu2Zr2 tetrahedra, corners with two equivalent O(4)EuZr3 tetrahedra, corners with two equivalent O(2)Zr4 tetrahedra, corners with six equivalent O(1)Eu3Zr tetrahedra,  an edgeedge with one O(1)Eu3Zr tetrahedra,  an edgeedge with one O(4)EuZr3 tetrahedra, and edges with two equivalent O(5)Eu2Zr2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Zr(1) and two equivalent Zr(2) atoms to form OZr4 tetrahedra that share corners with two equivalent O(3)Eu2Zr2 tetrahedra, corners with two equivalent O(5)Eu2Zr2 tetrahedra, corners with four equivalent O(1)Eu3Zr tetrahedra, corners with four equivalent O(4)EuZr3 tetrahedra, corners with four equivalent O(2)Zr4 tetrahedra,  an edgeedge with one O(3)Eu2Zr2 tetrahedra,  an edgeedge with one O(5)Eu2Zr2 tetrahedra, and edges with four equivalent O(4)EuZr3 tetrahedra. In the third O site, O(3) is bonded to two equivalent Eu(2) and two equivalent Zr(2) atoms to form OEu2Zr2 tetrahedra that share corners with two equivalent O(2)Zr4 tetrahedra, corners with four equivalent O(3)Eu2Zr2 tetrahedra, corners with four equivalent O(1)Eu3Zr tetrahedra, corners with four equivalent O(4)EuZr3 tetrahedra,  an edgeedge with one O(2)Zr4 tetrahedra, and edges with four equivalent O(4)EuZr3 tetrahedra. In the fourth O site, O(4) is bonded to one Eu(2), one Zr(1), and two equivalent Zr(2) atoms to form OEuZr3 tetrahedra that share corners with two equivalent O(3)Eu2Zr2 tetrahedra, corners with two equivalent O(5)Eu2Zr2 tetrahedra, corners with two equivalent O(1)Eu3Zr tetrahedra, corners with two equivalent O(2)Zr4 tetrahedra, corners with six equivalent O(4)EuZr3 tetrahedra,  an edgeedge with one O(1)Eu3Zr tetrahedra,  an edgeedge with one O(4)EuZr3 tetrahedra, edges with two equivalent O(3)Eu2Zr2 tetrahedra, and edges with two equivalent O(2)Zr4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Eu(1) and two equivalent Zr(1) atoms to form OEu2Zr2 tetrahedra that share corners with two equivalent O(2)Zr4 tetrahedra, corners with four equivalent O(5)Eu2Zr2 tetrahedra, corners with four equivalent O(1)Eu3Zr tetrahedra, corners with four equivalent O(4)EuZr3 tetrahedra,  an edgeedge with one O(2)Zr4 tetrahedra, and edges with four equivalent O(1)Eu3Zr tetrahedra. is represented by the CIF file [CIF]
data_Eu2Zr2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.690
_cell_length_b   7.503
_cell_length_c   10.781
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   298.455
_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  0.500  0.500  0.500  1.0
  Eu  Eu1  1  0.000  0.750  0.226  1.0
  Eu  Eu2  1  0.500  0.000  0.500  1.0
  Eu  Eu3  1  0.000  0.250  0.774  1.0
  Zr  Zr4  1  0.000  0.250  0.243  1.0
  Zr  Zr5  1  0.000  0.750  0.757  1.0
  Zr  Zr6  1  0.500  0.500  0.000  1.0
  Zr  Zr7  1  0.500  0.000  0.000  1.0
  O  O8  1  0.000  0.473  0.634  1.0
  O  O9  1  0.500  0.750  0.865  1.0
  O  O10  1  0.500  0.250  0.895  1.0
  O  O11  1  0.000  0.023  0.115  1.0
  O  O12  1  0.000  0.477  0.115  1.0
  O  O13  1  0.000  0.523  0.885  1.0
  O  O14  1  0.500  0.250  0.376  1.0
  O  O15  1  0.500  0.750  0.105  1.0
  O  O16  1  0.000  0.973  0.366  1.0
  O  O17  1  0.000  0.027  0.634  1.0
  O  O18  1  0.000  0.527  0.366  1.0
  O  O19  1  0.500  0.750  0.624  1.0
  O  O20  1  0.000  0.977  0.885  1.0
  O  O21  1  0.500  0.250  0.135  1.0
[/CIF]
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The crystal structure described by Eu2Zr2O7 crystallizes in the orthorhombic Pmma space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to two equivalent O(5) and four equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing EuO6 octahedra. The corner-sharing octahedral tilt angles are 71°. In the second Eu site, Eu(2) is bonded in a distorted hexagonal planar geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent Zr sites. In the first Zr site, Zr(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. In the second Zr site, Zr(2) is bonded in a body-centered cubic geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(4) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Eu(2), two equivalent Eu(1), and one Zr(1) atom to form OEu3Zr tetrahedra that share corners with two equivalent O(3)Eu2Zr2 tetrahedra, corners with two equivalent O(5)Eu2Zr2 tetrahedra, corners with two equivalent O(4)EuZr3 tetrahedra, corners with two equivalent O(2)Zr4 tetrahedra, corners with six equivalent O(1)Eu3Zr tetrahedra,  an edgeedge with one O(1)Eu3Zr tetrahedra,  an edgeedge with one O(4)EuZr3 tetrahedra, and edges with two equivalent O(5)Eu2Zr2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Zr(1) and two equivalent Zr(2) atoms to form OZr4 tetrahedra that share corners with two equivalent O(3)Eu2Zr2 tetrahedra, corners with two equivalent O(5)Eu2Zr2 tetrahedra, corners with four equivalent O(1)Eu3Zr tetrahedra, corners with four equivalent O(4)EuZr3 tetrahedra, corners with four equivalent O(2)Zr4 tetrahedra,  an edgeedge with one O(3)Eu2Zr2 tetrahedra,  an edgeedge with one O(5)Eu2Zr2 tetrahedra, and edges with four equivalent O(4)EuZr3 tetrahedra. In the third O site, O(3) is bonded to two equivalent Eu(2) and two equivalent Zr(2) atoms to form OEu2Zr2 tetrahedra that share corners with two equivalent O(2)Zr4 tetrahedra, corners with four equivalent O(3)Eu2Zr2 tetrahedra, corners with four equivalent O(1)Eu3Zr tetrahedra, corners with four equivalent O(4)EuZr3 tetrahedra,  an edgeedge with one O(2)Zr4 tetrahedra, and edges with four equivalent O(4)EuZr3 tetrahedra. In the fourth O site, O(4) is bonded to one Eu(2), one Zr(1), and two equivalent Zr(2) atoms to form OEuZr3 tetrahedra that share corners with two equivalent O(3)Eu2Zr2 tetrahedra, corners with two equivalent O(5)Eu2Zr2 tetrahedra, corners with two equivalent O(1)Eu3Zr tetrahedra, corners with two equivalent O(2)Zr4 tetrahedra, corners with six equivalent O(4)EuZr3 tetrahedra,  an edgeedge with one O(1)Eu3Zr tetrahedra,  an edgeedge with one O(4)EuZr3 tetrahedra, edges with two equivalent O(3)Eu2Zr2 tetrahedra, and edges with two equivalent O(2)Zr4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Eu(1) and two equivalent Zr(1) atoms to form OEu2Zr2 tetrahedra that share corners with two equivalent O(2)Zr4 tetrahedra, corners with four equivalent O(5)Eu2Zr2 tetrahedra, corners with four equivalent O(1)Eu3Zr tetrahedra, corners with four equivalent O(4)EuZr3 tetrahedra,  an edgeedge with one O(2)Zr4 tetrahedra, and edges with four equivalent O(1)Eu3Zr tetrahedra. is represented by the CIF file [CIF]
data_Eu2Zr2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.690
_cell_length_b   7.503
_cell_length_c   10.781
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   298.455
_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  0.500  0.500  0.500  1.0
  Eu  Eu1  1  0.000  0.750  0.226  1.0
  Eu  Eu2  1  0.500  0.000  0.500  1.0
  Eu  Eu3  1  0.000  0.250  0.774  1.0
  Zr  Zr4  1  0.000  0.250  0.243  1.0
  Zr  Zr5  1  0.000  0.750  0.757  1.0
  Zr  Zr6  1  0.500  0.500  0.000  1.0
  Zr  Zr7  1  0.500  0.000  0.000  1.0
  O  O8  1  0.000  0.473  0.634  1.0
  O  O9  1  0.500  0.750  0.865  1.0
  O  O10  1  0.500  0.250  0.895  1.0
  O  O11  1  0.000  0.023  0.115  1.0
  O  O12  1  0.000  0.477  0.115  1.0
  O  O13  1  0.000  0.523  0.885  1.0
  O  O14  1  0.500  0.250  0.376  1.0
  O  O15  1  0.500  0.750  0.105  1.0
  O  O16  1  0.000  0.973  0.366  1.0
  O  O17  1  0.000  0.027  0.634  1.0
  O  O18  1  0.000  0.527  0.366  1.0
  O  O19  1  0.500  0.750  0.624  1.0
  O  O20  1  0.000  0.977  0.885  1.0
  O  O21  1  0.500  0.250  0.135  1.0
[/CIF]
.