The structure described by Ba2FeGe2O7 crystallizes in the tetragonal P-42_1m space group. Ba(1) is bonded in a 8-coordinate geometry to one O(1), three equivalent O(2), and four equivalent O(3) atoms. Fe(1) is bonded to four equivalent O(3) atoms to form FeO4 tetrahedra that share corners with four equivalent Ge(1)O4 tetrahedra. Ge(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form GeO4 tetrahedra that share  a cornercorner with one Ge(1)O4 tetrahedra and corners with two equivalent Fe(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Ba(1) and two equivalent Ge(1) atoms. In the second O site, O(2) is bonded to three equivalent Ba(1) and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OBa3Ge tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one Fe(1), and one Ge(1) atom. is represented by the CIF card [CIF]
data_Ba2FeGe2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.508
_cell_length_b   8.526
_cell_length_c   8.526
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   400.382
_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
  Ba  Ba0  1  0.992  0.834  0.334  1.0
  Ba  Ba1  1  0.008  0.334  0.166  1.0
  Ba  Ba2  1  0.992  0.166  0.666  1.0
  Ba  Ba3  1  0.008  0.666  0.834  1.0
  Fe  Fe4  1  0.500  0.500  0.500  1.0
  Fe  Fe5  1  0.500  1.000  1.000  1.0
  Ge  Ge6  1  0.530  0.638  0.138  1.0
  Ge  Ge7  1  0.470  0.138  0.362  1.0
  Ge  Ge8  1  0.530  0.362  0.862  1.0
  Ge  Ge9  1  0.470  0.862  0.638  1.0
  O  O10  1  0.655  0.500  0.000  1.0
  O  O11  1  0.345  1.000  0.500  1.0
  O  O12  1  0.216  0.634  0.135  1.0
  O  O13  1  0.784  0.135  0.366  1.0
  O  O14  1  0.216  0.366  0.865  1.0
  O  O15  1  0.784  0.865  0.634  1.0
  O  O16  1  0.675  0.579  0.313  1.0
  O  O17  1  0.325  0.079  0.187  1.0
  O  O18  1  0.675  0.421  0.687  1.0
  O  O19  1  0.325  0.921  0.813  1.0
  O  O20  1  0.325  0.687  0.579  1.0
  O  O21  1  0.675  0.187  0.921  1.0
  O  O22  1  0.325  0.313  0.421  1.0
  O  O23  1  0.675  0.813  0.079  1.0
[/CIF]
.
The structure described by Ba2FeGe2O7 crystallizes in the tetragonal P-42_1m space group. Ba(1) is bonded in a 8-coordinate geometry to one O(1), three equivalent O(2), and four equivalent O(3) atoms. Fe(1) is bonded to four equivalent O(3) atoms to form FeO4 tetrahedra that share corners with four equivalent Ge(1)O4 tetrahedra. Ge(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form GeO4 tetrahedra that share  a cornercorner with one Ge(1)O4 tetrahedra and corners with two equivalent Fe(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Ba(1) and two equivalent Ge(1) atoms. In the second O site, O(2) is bonded to three equivalent Ba(1) and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OBa3Ge tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one Fe(1), and one Ge(1) atom. is represented by the CIF card [CIF]
data_Ba2FeGe2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.508
_cell_length_b   8.526
_cell_length_c   8.526
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   400.382
_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
  Ba  Ba0  1  0.992  0.834  0.334  1.0
  Ba  Ba1  1  0.008  0.334  0.166  1.0
  Ba  Ba2  1  0.992  0.166  0.666  1.0
  Ba  Ba3  1  0.008  0.666  0.834  1.0
  Fe  Fe4  1  0.500  0.500  0.500  1.0
  Fe  Fe5  1  0.500  1.000  1.000  1.0
  Ge  Ge6  1  0.530  0.638  0.138  1.0
  Ge  Ge7  1  0.470  0.138  0.362  1.0
  Ge  Ge8  1  0.530  0.362  0.862  1.0
  Ge  Ge9  1  0.470  0.862  0.638  1.0
  O  O10  1  0.655  0.500  0.000  1.0
  O  O11  1  0.345  1.000  0.500  1.0
  O  O12  1  0.216  0.634  0.135  1.0
  O  O13  1  0.784  0.135  0.366  1.0
  O  O14  1  0.216  0.366  0.865  1.0
  O  O15  1  0.784  0.865  0.634  1.0
  O  O16  1  0.675  0.579  0.313  1.0
  O  O17  1  0.325  0.079  0.187  1.0
  O  O18  1  0.675  0.421  0.687  1.0
  O  O19  1  0.325  0.921  0.813  1.0
  O  O20  1  0.325  0.687  0.579  1.0
  O  O21  1  0.675  0.187  0.921  1.0
  O  O22  1  0.325  0.313  0.421  1.0
  O  O23  1  0.675  0.813  0.079  1.0
[/CIF]
.