The crystal structure described by UP2O7 crystallizes in the orthorhombic Pca2_1 space group. U(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form UO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(4), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent U(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 3-14°. In the second P site, P(2) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent U(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 9-12°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the second O site, O(2) is bonded in a linear geometry to one U(1) and one P(2) atom. In the third O site, O(3) is bonded in a linear geometry to one U(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to one U(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a linear geometry to one U(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a linear geometry to one U(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a linear geometry to one U(1) and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_UP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.878
_cell_length_b   8.878
_cell_length_c   8.889
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   700.610
_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
  U  U0  1  0.994  0.495  0.750  1.0
  U  U1  1  0.494  0.005  0.750  1.0
  U  U2  1  0.994  0.995  0.250  1.0
  U  U3  1  0.494  0.505  0.250  1.0
  P  P4  1  0.097  0.393  0.351  1.0
  P  P5  1  0.393  0.403  0.852  1.0
  P  P6  1  0.597  0.107  0.351  1.0
  P  P7  1  0.893  0.097  0.852  1.0
  P  P8  1  0.393  0.903  0.148  1.0
  P  P9  1  0.097  0.893  0.649  1.0
  P  P10  1  0.893  0.597  0.148  1.0
  P  P11  1  0.597  0.607  0.649  1.0
  O  O12  1  0.974  0.474  0.250  1.0
  O  O13  1  0.225  0.435  0.831  1.0
  O  O14  1  0.253  0.454  0.310  1.0
  O  O15  1  0.053  0.428  0.514  1.0
  O  O16  1  0.446  0.432  0.013  1.0
  O  O17  1  0.936  0.253  0.795  1.0
  O  O18  1  0.580  0.275  0.313  1.0
  O  O19  1  0.436  0.247  0.795  1.0
  O  O20  1  0.080  0.225  0.313  1.0
  O  O21  1  0.946  0.068  0.013  1.0
  O  O22  1  0.553  0.072  0.514  1.0
  O  O23  1  0.725  0.065  0.831  1.0
  O  O24  1  0.753  0.046  0.310  1.0
  O  O25  1  0.474  0.026  0.250  1.0
  O  O26  1  0.974  0.974  0.750  1.0
  O  O27  1  0.225  0.935  0.169  1.0
  O  O28  1  0.253  0.954  0.690  1.0
  O  O29  1  0.446  0.932  0.987  1.0
  O  O30  1  0.053  0.928  0.486  1.0
  O  O31  1  0.936  0.753  0.205  1.0
  O  O32  1  0.580  0.775  0.687  1.0
  O  O33  1  0.436  0.747  0.205  1.0
  O  O34  1  0.080  0.725  0.687  1.0
  O  O35  1  0.946  0.568  0.987  1.0
  O  O36  1  0.553  0.572  0.486  1.0
  O  O37  1  0.753  0.546  0.690  1.0
  O  O38  1  0.725  0.565  0.169  1.0
  O  O39  1  0.474  0.526  0.750  1.0
[/CIF]
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The crystal structure described by UP2O7 crystallizes in the orthorhombic Pca2_1 space group. U(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form UO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(4), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent U(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 3-14°. In the second P site, P(2) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent U(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 9-12°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the second O site, O(2) is bonded in a linear geometry to one U(1) and one P(2) atom. In the third O site, O(3) is bonded in a linear geometry to one U(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to one U(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a linear geometry to one U(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a linear geometry to one U(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a linear geometry to one U(1) and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_UP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.878
_cell_length_b   8.878
_cell_length_c   8.889
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   700.610
_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
  U  U0  1  0.994  0.495  0.750  1.0
  U  U1  1  0.494  0.005  0.750  1.0
  U  U2  1  0.994  0.995  0.250  1.0
  U  U3  1  0.494  0.505  0.250  1.0
  P  P4  1  0.097  0.393  0.351  1.0
  P  P5  1  0.393  0.403  0.852  1.0
  P  P6  1  0.597  0.107  0.351  1.0
  P  P7  1  0.893  0.097  0.852  1.0
  P  P8  1  0.393  0.903  0.148  1.0
  P  P9  1  0.097  0.893  0.649  1.0
  P  P10  1  0.893  0.597  0.148  1.0
  P  P11  1  0.597  0.607  0.649  1.0
  O  O12  1  0.974  0.474  0.250  1.0
  O  O13  1  0.225  0.435  0.831  1.0
  O  O14  1  0.253  0.454  0.310  1.0
  O  O15  1  0.053  0.428  0.514  1.0
  O  O16  1  0.446  0.432  0.013  1.0
  O  O17  1  0.936  0.253  0.795  1.0
  O  O18  1  0.580  0.275  0.313  1.0
  O  O19  1  0.436  0.247  0.795  1.0
  O  O20  1  0.080  0.225  0.313  1.0
  O  O21  1  0.946  0.068  0.013  1.0
  O  O22  1  0.553  0.072  0.514  1.0
  O  O23  1  0.725  0.065  0.831  1.0
  O  O24  1  0.753  0.046  0.310  1.0
  O  O25  1  0.474  0.026  0.250  1.0
  O  O26  1  0.974  0.974  0.750  1.0
  O  O27  1  0.225  0.935  0.169  1.0
  O  O28  1  0.253  0.954  0.690  1.0
  O  O29  1  0.446  0.932  0.987  1.0
  O  O30  1  0.053  0.928  0.486  1.0
  O  O31  1  0.936  0.753  0.205  1.0
  O  O32  1  0.580  0.775  0.687  1.0
  O  O33  1  0.436  0.747  0.205  1.0
  O  O34  1  0.080  0.725  0.687  1.0
  O  O35  1  0.946  0.568  0.987  1.0
  O  O36  1  0.553  0.572  0.486  1.0
  O  O37  1  0.753  0.546  0.690  1.0
  O  O38  1  0.725  0.565  0.169  1.0
  O  O39  1  0.474  0.526  0.750  1.0
[/CIF]
.