The material described by GeP2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form GeO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra and corners with four equivalent P(1)O4 tetrahedra. In the second Ge site, Ge(2) is bonded to two equivalent O(1), two equivalent O(6), and two equivalent O(7) atoms to form GeO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra and corners with four equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Ge(2)O6 octahedra, corners with two equivalent Ge(1)O6 octahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-51°. In the second P site, P(2) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Ge(1)O6 octahedra, corners with two equivalent Ge(2)O6 octahedra, and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-49°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Ge(2) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Ge(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Ge(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Ge(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Ge(2) and one P(1) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Ge(2) and one P(2) atom. is represented by the CIF file [CIF]
data_GeP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.669
_cell_length_b   6.736
_cell_length_c   7.757
_cell_angle_alpha   91.526
_cell_angle_beta   92.886
_cell_angle_gamma   105.340
_symmetry_Int_Tables_number   1
_cell_volume   234.790
_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
  Ge  Ge0  1  0.500  0.500  0.500  1.0
  Ge  Ge1  1  0.000  0.000  0.000  1.0
  P  P2  1  0.888  0.254  0.311  1.0
  P  P3  1  0.112  0.746  0.689  1.0
  P  P4  1  0.479  0.861  0.237  1.0
  P  P5  1  0.521  0.139  0.763  1.0
  O  O6  1  0.207  0.935  0.193  1.0
  O  O7  1  0.793  0.065  0.807  1.0
  O  O8  1  0.154  0.295  0.438  1.0
  O  O9  1  0.846  0.705  0.562  1.0
  O  O10  1  0.695  0.033  0.362  1.0
  O  O11  1  0.305  0.967  0.638  1.0
  O  O12  1  0.300  0.596  0.675  1.0
  O  O13  1  0.700  0.404  0.325  1.0
  O  O14  1  0.615  0.329  0.659  1.0
  O  O15  1  0.385  0.671  0.341  1.0
  O  O16  1  0.043  0.767  0.877  1.0
  O  O17  1  0.957  0.233  0.123  1.0
  O  O18  1  0.352  0.167  0.919  1.0
  O  O19  1  0.648  0.833  0.081  1.0
[/CIF]
.
The material described by GeP2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form GeO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra and corners with four equivalent P(1)O4 tetrahedra. In the second Ge site, Ge(2) is bonded to two equivalent O(1), two equivalent O(6), and two equivalent O(7) atoms to form GeO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra and corners with four equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Ge(2)O6 octahedra, corners with two equivalent Ge(1)O6 octahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-51°. In the second P site, P(2) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Ge(1)O6 octahedra, corners with two equivalent Ge(2)O6 octahedra, and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-49°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Ge(2) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Ge(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Ge(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Ge(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Ge(2) and one P(1) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Ge(2) and one P(2) atom. is represented by the CIF file [CIF]
data_GeP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.669
_cell_length_b   6.736
_cell_length_c   7.757
_cell_angle_alpha   91.526
_cell_angle_beta   92.886
_cell_angle_gamma   105.340
_symmetry_Int_Tables_number   1
_cell_volume   234.790
_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
  Ge  Ge0  1  0.500  0.500  0.500  1.0
  Ge  Ge1  1  0.000  0.000  0.000  1.0
  P  P2  1  0.888  0.254  0.311  1.0
  P  P3  1  0.112  0.746  0.689  1.0
  P  P4  1  0.479  0.861  0.237  1.0
  P  P5  1  0.521  0.139  0.763  1.0
  O  O6  1  0.207  0.935  0.193  1.0
  O  O7  1  0.793  0.065  0.807  1.0
  O  O8  1  0.154  0.295  0.438  1.0
  O  O9  1  0.846  0.705  0.562  1.0
  O  O10  1  0.695  0.033  0.362  1.0
  O  O11  1  0.305  0.967  0.638  1.0
  O  O12  1  0.300  0.596  0.675  1.0
  O  O13  1  0.700  0.404  0.325  1.0
  O  O14  1  0.615  0.329  0.659  1.0
  O  O15  1  0.385  0.671  0.341  1.0
  O  O16  1  0.043  0.767  0.877  1.0
  O  O17  1  0.957  0.233  0.123  1.0
  O  O18  1  0.352  0.167  0.919  1.0
  O  O19  1  0.648  0.833  0.081  1.0
[/CIF]
.