The material structure described by Eu2Ge2O7 crystallizes in the tetragonal P4_12_12 space group. Eu(1) is bonded to two equivalent O(1), two equivalent O(4), and three equivalent O(2) atoms to form distorted EuO7 pentagonal bipyramids that share corners with five equivalent Ge(1)O4 tetrahedra, edges with five equivalent Eu(1)O7 pentagonal bipyramids, and  an edgeedge with one Ge(1)O4 tetrahedra. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with five equivalent Eu(1)O7 pentagonal bipyramids,  a cornercorner with one Ge(1)O4 tetrahedra, and  an edgeedge with one Eu(1)O7 pentagonal bipyramid. There are four inequivalent O sites. In the first O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Ge(1) atoms. In the second O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Eu(1) and one Ge(1) atom. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Eu(1) and one Ge(1) atom. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to three equivalent Eu(1) and one Ge(1) atom. is represented by the CIF card [CIF]
data_Eu2Ge2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.038
_cell_length_b   7.038
_cell_length_c   12.726
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   630.368
_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  0.650  0.118  0.365  1.0
  Eu  Eu1  1  0.350  0.882  0.865  1.0
  Eu  Eu2  1  0.118  0.650  0.635  1.0
  Eu  Eu3  1  0.618  0.850  0.115  1.0
  Eu  Eu4  1  0.382  0.150  0.615  1.0
  Eu  Eu5  1  0.850  0.618  0.885  1.0
  Eu  Eu6  1  0.150  0.382  0.385  1.0
  Eu  Eu7  1  0.882  0.350  0.135  1.0
  Ge  Ge8  1  0.844  0.095  0.878  1.0
  Ge  Ge9  1  0.156  0.905  0.378  1.0
  Ge  Ge10  1  0.095  0.844  0.122  1.0
  Ge  Ge11  1  0.595  0.656  0.628  1.0
  Ge  Ge12  1  0.405  0.344  0.128  1.0
  Ge  Ge13  1  0.656  0.595  0.372  1.0
  Ge  Ge14  1  0.344  0.405  0.872  1.0
  Ge  Ge15  1  0.905  0.156  0.622  1.0
  O  O16  1  0.857  0.305  0.954  1.0
  O  O17  1  0.143  0.695  0.454  1.0
  O  O18  1  0.305  0.857  0.046  1.0
  O  O19  1  0.805  0.643  0.704  1.0
  O  O20  1  0.195  0.357  0.204  1.0
  O  O21  1  0.643  0.805  0.296  1.0
  O  O22  1  0.357  0.195  0.796  1.0
  O  O23  1  0.695  0.143  0.546  1.0
  O  O24  1  0.661  0.940  0.927  1.0
  O  O25  1  0.339  0.060  0.427  1.0
  O  O26  1  0.940  0.661  0.073  1.0
  O  O27  1  0.440  0.839  0.677  1.0
  O  O28  1  0.560  0.161  0.177  1.0
  O  O29  1  0.839  0.440  0.323  1.0
  O  O30  1  0.161  0.560  0.823  1.0
  O  O31  1  0.060  0.339  0.573  1.0
  O  O32  1  0.303  0.303  0.000  1.0
  O  O33  1  0.197  0.803  0.250  1.0
  O  O34  1  0.803  0.197  0.750  1.0
  O  O35  1  0.697  0.697  0.500  1.0
  O  O36  1  0.077  0.976  0.627  1.0
  O  O37  1  0.524  0.577  0.877  1.0
  O  O38  1  0.476  0.423  0.377  1.0
  O  O39  1  0.577  0.524  0.123  1.0
  O  O40  1  0.423  0.476  0.623  1.0
  O  O41  1  0.923  0.024  0.127  1.0
  O  O42  1  0.976  0.077  0.373  1.0
  O  O43  1  0.024  0.923  0.873  1.0
[/CIF]
.
The material structure described by Eu2Ge2O7 crystallizes in the tetragonal P4_12_12 space group. Eu(1) is bonded to two equivalent O(1), two equivalent O(4), and three equivalent O(2) atoms to form distorted EuO7 pentagonal bipyramids that share corners with five equivalent Ge(1)O4 tetrahedra, edges with five equivalent Eu(1)O7 pentagonal bipyramids, and  an edgeedge with one Ge(1)O4 tetrahedra. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with five equivalent Eu(1)O7 pentagonal bipyramids,  a cornercorner with one Ge(1)O4 tetrahedra, and  an edgeedge with one Eu(1)O7 pentagonal bipyramid. There are four inequivalent O sites. In the first O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Ge(1) atoms. In the second O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Eu(1) and one Ge(1) atom. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Eu(1) and one Ge(1) atom. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to three equivalent Eu(1) and one Ge(1) atom. is represented by the CIF card [CIF]
data_Eu2Ge2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.038
_cell_length_b   7.038
_cell_length_c   12.726
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   630.368
_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  0.650  0.118  0.365  1.0
  Eu  Eu1  1  0.350  0.882  0.865  1.0
  Eu  Eu2  1  0.118  0.650  0.635  1.0
  Eu  Eu3  1  0.618  0.850  0.115  1.0
  Eu  Eu4  1  0.382  0.150  0.615  1.0
  Eu  Eu5  1  0.850  0.618  0.885  1.0
  Eu  Eu6  1  0.150  0.382  0.385  1.0
  Eu  Eu7  1  0.882  0.350  0.135  1.0
  Ge  Ge8  1  0.844  0.095  0.878  1.0
  Ge  Ge9  1  0.156  0.905  0.378  1.0
  Ge  Ge10  1  0.095  0.844  0.122  1.0
  Ge  Ge11  1  0.595  0.656  0.628  1.0
  Ge  Ge12  1  0.405  0.344  0.128  1.0
  Ge  Ge13  1  0.656  0.595  0.372  1.0
  Ge  Ge14  1  0.344  0.405  0.872  1.0
  Ge  Ge15  1  0.905  0.156  0.622  1.0
  O  O16  1  0.857  0.305  0.954  1.0
  O  O17  1  0.143  0.695  0.454  1.0
  O  O18  1  0.305  0.857  0.046  1.0
  O  O19  1  0.805  0.643  0.704  1.0
  O  O20  1  0.195  0.357  0.204  1.0
  O  O21  1  0.643  0.805  0.296  1.0
  O  O22  1  0.357  0.195  0.796  1.0
  O  O23  1  0.695  0.143  0.546  1.0
  O  O24  1  0.661  0.940  0.927  1.0
  O  O25  1  0.339  0.060  0.427  1.0
  O  O26  1  0.940  0.661  0.073  1.0
  O  O27  1  0.440  0.839  0.677  1.0
  O  O28  1  0.560  0.161  0.177  1.0
  O  O29  1  0.839  0.440  0.323  1.0
  O  O30  1  0.161  0.560  0.823  1.0
  O  O31  1  0.060  0.339  0.573  1.0
  O  O32  1  0.303  0.303  0.000  1.0
  O  O33  1  0.197  0.803  0.250  1.0
  O  O34  1  0.803  0.197  0.750  1.0
  O  O35  1  0.697  0.697  0.500  1.0
  O  O36  1  0.077  0.976  0.627  1.0
  O  O37  1  0.524  0.577  0.877  1.0
  O  O38  1  0.476  0.423  0.377  1.0
  O  O39  1  0.577  0.524  0.123  1.0
  O  O40  1  0.423  0.476  0.623  1.0
  O  O41  1  0.923  0.024  0.127  1.0
  O  O42  1  0.976  0.077  0.373  1.0
  O  O43  1  0.024  0.923  0.873  1.0
[/CIF]
.