The crystal structure described by Sr2CoGe2O7 crystallizes in the tetragonal P-42_1m space group. Sr(1) is bonded in a 8-coordinate geometry to one O(1), three equivalent O(2), and four equivalent O(3) atoms. Co(1) is bonded to four equivalent O(3) atoms to form CoO4 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 Co(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1) and two equivalent Ge(1) atoms to form a mixture of distorted corner and edge-sharing OSr2Ge2 tetrahedra. In the second O site, O(2) is bonded to three equivalent Sr(1) and one Ge(1) atom to form distorted OSr3Ge tetrahedra that share corners with two equivalent O(1)Sr2Ge2 tetrahedra, corners with four equivalent O(2)Sr3Ge tetrahedra,  an edgeedge with one O(1)Sr2Ge2 tetrahedra, and  an edgeedge with one O(2)Sr3Ge tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Co(1), and one Ge(1) atom. is represented by the CIF file [CIF]
data_Sr2CoGe2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.395
_cell_length_b   8.262
_cell_length_c   8.262
_cell_angle_alpha   89.997
_cell_angle_beta   89.998
_cell_angle_gamma   89.999
_symmetry_Int_Tables_number   1
_cell_volume   368.272
_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
  Sr  Sr0  1  0.507  0.834  0.334  1.0
  Sr  Sr1  1  0.493  0.666  0.834  1.0
  Sr  Sr2  1  0.507  0.166  0.666  1.0
  Sr  Sr3  1  0.493  0.334  0.166  1.0
  Co  Co4  1  1.000  1.000  1.000  1.0
  Co  Co5  1  0.000  0.500  0.500  1.0
  Ge  Ge6  1  0.951  0.357  0.857  1.0
  Ge  Ge7  1  0.049  0.143  0.357  1.0
  Ge  Ge8  1  0.951  0.643  0.143  1.0
  Ge  Ge9  1  0.049  0.857  0.643  1.0
  O  O10  1  0.184  0.000  0.500  1.0
  O  O11  1  0.816  0.500  1.000  1.0
  O  O12  1  0.274  0.362  0.861  1.0
  O  O13  1  0.726  0.139  0.362  1.0
  O  O14  1  0.274  0.638  0.139  1.0
  O  O15  1  0.726  0.861  0.638  1.0
  O  O16  1  0.208  0.321  0.418  1.0
  O  O17  1  0.791  0.179  0.918  1.0
  O  O18  1  0.208  0.679  0.582  1.0
  O  O19  1  0.791  0.821  0.082  1.0
  O  O20  1  0.792  0.582  0.321  1.0
  O  O21  1  0.209  0.918  0.821  1.0
  O  O22  1  0.792  0.418  0.679  1.0
  O  O23  1  0.209  0.082  0.179  1.0
[/CIF]
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The crystal structure described by Sr2CoGe2O7 crystallizes in the tetragonal P-42_1m space group. Sr(1) is bonded in a 8-coordinate geometry to one O(1), three equivalent O(2), and four equivalent O(3) atoms. Co(1) is bonded to four equivalent O(3) atoms to form CoO4 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 Co(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1) and two equivalent Ge(1) atoms to form a mixture of distorted corner and edge-sharing OSr2Ge2 tetrahedra. In the second O site, O(2) is bonded to three equivalent Sr(1) and one Ge(1) atom to form distorted OSr3Ge tetrahedra that share corners with two equivalent O(1)Sr2Ge2 tetrahedra, corners with four equivalent O(2)Sr3Ge tetrahedra,  an edgeedge with one O(1)Sr2Ge2 tetrahedra, and  an edgeedge with one O(2)Sr3Ge tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Co(1), and one Ge(1) atom. is represented by the CIF file [CIF]
data_Sr2CoGe2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.395
_cell_length_b   8.262
_cell_length_c   8.262
_cell_angle_alpha   89.997
_cell_angle_beta   89.998
_cell_angle_gamma   89.999
_symmetry_Int_Tables_number   1
_cell_volume   368.272
_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
  Sr  Sr0  1  0.507  0.834  0.334  1.0
  Sr  Sr1  1  0.493  0.666  0.834  1.0
  Sr  Sr2  1  0.507  0.166  0.666  1.0
  Sr  Sr3  1  0.493  0.334  0.166  1.0
  Co  Co4  1  1.000  1.000  1.000  1.0
  Co  Co5  1  0.000  0.500  0.500  1.0
  Ge  Ge6  1  0.951  0.357  0.857  1.0
  Ge  Ge7  1  0.049  0.143  0.357  1.0
  Ge  Ge8  1  0.951  0.643  0.143  1.0
  Ge  Ge9  1  0.049  0.857  0.643  1.0
  O  O10  1  0.184  0.000  0.500  1.0
  O  O11  1  0.816  0.500  1.000  1.0
  O  O12  1  0.274  0.362  0.861  1.0
  O  O13  1  0.726  0.139  0.362  1.0
  O  O14  1  0.274  0.638  0.139  1.0
  O  O15  1  0.726  0.861  0.638  1.0
  O  O16  1  0.208  0.321  0.418  1.0
  O  O17  1  0.791  0.179  0.918  1.0
  O  O18  1  0.208  0.679  0.582  1.0
  O  O19  1  0.791  0.821  0.082  1.0
  O  O20  1  0.792  0.582  0.321  1.0
  O  O21  1  0.209  0.918  0.821  1.0
  O  O22  1  0.792  0.418  0.679  1.0
  O  O23  1  0.209  0.082  0.179  1.0
[/CIF]
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