The crystal structure described by Sr3U(Te2O7)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(1), one O(2), one O(3), two equivalent O(4), and two equivalent O(5) atoms to form distorted SrO7 pentagonal bipyramids that share  a cornercorner with one U(1)O6 octahedra and edges with two equivalent Sr(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 70°. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. U(1) is bonded to two equivalent O(3), two equivalent O(6), and two equivalent O(7) atoms to form UO6 octahedra that share corners with two equivalent Sr(1)O7 pentagonal bipyramids. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(6) atom. In the second Te site, Te(2) is bonded in a distorted trigonal non-coplanar geometry to one O(2), one O(4), and one O(5) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one Te(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one Te(2) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one U(1), and one Te(1) atom. In the fourth O site, O(4) is bonded to one Sr(2), two equivalent Sr(1), and one Te(2) atom to form a mixture of distorted edge and corner-sharing OSr3Te tetrahedra. In the fifth O site, O(5) is bonded to one Sr(2), two equivalent Sr(1), and one Te(2) atom to form a mixture of distorted edge and corner-sharing OSr3Te trigonal pyramids. In the sixth O site, O(6) is bonded in a linear geometry to one U(1) and one Te(1) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one U(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr3U(Te2O7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.895
_cell_length_b   10.895
_cell_length_c   13.244
_cell_angle_alpha   86.361
_cell_angle_beta   86.361
_cell_angle_gamma   30.532
_symmetry_Int_Tables_number   1
_cell_volume   796.868
_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  0.294  0.828  0.942  1.0
  Sr  Sr1  1  0.828  0.294  0.442  1.0
  Sr  Sr2  1  0.172  0.706  0.558  1.0
  Sr  Sr3  1  0.721  0.279  0.750  1.0
  Sr  Sr4  1  0.706  0.172  0.058  1.0
  Sr  Sr5  1  0.279  0.721  0.250  1.0
  U  U6  1  0.000  0.500  0.500  1.0
  U  U7  1  0.500  0.000  0.000  1.0
  Te  Te8  1  0.538  0.113  0.664  1.0
  Te  Te9  1  0.826  0.376  0.127  1.0
  Te  Te10  1  0.462  0.887  0.336  1.0
  Te  Te11  1  0.376  0.826  0.627  1.0
  Te  Te12  1  0.624  0.174  0.373  1.0
  Te  Te13  1  0.113  0.538  0.164  1.0
  Te  Te14  1  0.174  0.624  0.873  1.0
  Te  Te15  1  0.887  0.462  0.836  1.0
  O  O16  1  0.925  0.260  0.865  1.0
  O  O17  1  0.723  0.458  0.265  1.0
  O  O18  1  0.353  0.304  0.059  1.0
  O  O19  1  0.075  0.740  0.135  1.0
  O  O20  1  0.466  0.454  0.414  1.0
  O  O21  1  0.696  0.647  0.441  1.0
  O  O22  1  0.936  0.977  0.384  1.0
  O  O23  1  0.171  0.266  0.904  1.0
  O  O24  1  0.064  0.023  0.616  1.0
  O  O25  1  0.534  0.546  0.586  1.0
  O  O26  1  0.542  0.277  0.235  1.0
  O  O27  1  0.962  0.654  0.396  1.0
  O  O28  1  0.458  0.723  0.765  1.0
  O  O29  1  0.346  0.038  0.104  1.0
  O  O30  1  0.654  0.962  0.896  1.0
  O  O31  1  0.260  0.925  0.365  1.0
  O  O32  1  0.977  0.936  0.884  1.0
  O  O33  1  0.647  0.696  0.941  1.0
  O  O34  1  0.740  0.075  0.635  1.0
  O  O35  1  0.546  0.534  0.086  1.0
  O  O36  1  0.454  0.466  0.914  1.0
  O  O37  1  0.304  0.353  0.559  1.0
  O  O38  1  0.829  0.734  0.096  1.0
  O  O39  1  0.734  0.829  0.596  1.0
  O  O40  1  0.023  0.064  0.116  1.0
  O  O41  1  0.266  0.171  0.404  1.0
  O  O42  1  0.277  0.542  0.735  1.0
  O  O43  1  0.038  0.346  0.604  1.0
[/CIF]
.
The crystal structure described by Sr3U(Te2O7)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(1), one O(2), one O(3), two equivalent O(4), and two equivalent O(5) atoms to form distorted SrO7 pentagonal bipyramids that share  a cornercorner with one U(1)O6 octahedra and edges with two equivalent Sr(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 70°. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. U(1) is bonded to two equivalent O(3), two equivalent O(6), and two equivalent O(7) atoms to form UO6 octahedra that share corners with two equivalent Sr(1)O7 pentagonal bipyramids. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(6) atom. In the second Te site, Te(2) is bonded in a distorted trigonal non-coplanar geometry to one O(2), one O(4), and one O(5) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one Te(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one Te(2) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one U(1), and one Te(1) atom. In the fourth O site, O(4) is bonded to one Sr(2), two equivalent Sr(1), and one Te(2) atom to form a mixture of distorted edge and corner-sharing OSr3Te tetrahedra. In the fifth O site, O(5) is bonded to one Sr(2), two equivalent Sr(1), and one Te(2) atom to form a mixture of distorted edge and corner-sharing OSr3Te trigonal pyramids. In the sixth O site, O(6) is bonded in a linear geometry to one U(1) and one Te(1) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one U(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr3U(Te2O7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.895
_cell_length_b   10.895
_cell_length_c   13.244
_cell_angle_alpha   86.361
_cell_angle_beta   86.361
_cell_angle_gamma   30.532
_symmetry_Int_Tables_number   1
_cell_volume   796.868
_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  0.294  0.828  0.942  1.0
  Sr  Sr1  1  0.828  0.294  0.442  1.0
  Sr  Sr2  1  0.172  0.706  0.558  1.0
  Sr  Sr3  1  0.721  0.279  0.750  1.0
  Sr  Sr4  1  0.706  0.172  0.058  1.0
  Sr  Sr5  1  0.279  0.721  0.250  1.0
  U  U6  1  0.000  0.500  0.500  1.0
  U  U7  1  0.500  0.000  0.000  1.0
  Te  Te8  1  0.538  0.113  0.664  1.0
  Te  Te9  1  0.826  0.376  0.127  1.0
  Te  Te10  1  0.462  0.887  0.336  1.0
  Te  Te11  1  0.376  0.826  0.627  1.0
  Te  Te12  1  0.624  0.174  0.373  1.0
  Te  Te13  1  0.113  0.538  0.164  1.0
  Te  Te14  1  0.174  0.624  0.873  1.0
  Te  Te15  1  0.887  0.462  0.836  1.0
  O  O16  1  0.925  0.260  0.865  1.0
  O  O17  1  0.723  0.458  0.265  1.0
  O  O18  1  0.353  0.304  0.059  1.0
  O  O19  1  0.075  0.740  0.135  1.0
  O  O20  1  0.466  0.454  0.414  1.0
  O  O21  1  0.696  0.647  0.441  1.0
  O  O22  1  0.936  0.977  0.384  1.0
  O  O23  1  0.171  0.266  0.904  1.0
  O  O24  1  0.064  0.023  0.616  1.0
  O  O25  1  0.534  0.546  0.586  1.0
  O  O26  1  0.542  0.277  0.235  1.0
  O  O27  1  0.962  0.654  0.396  1.0
  O  O28  1  0.458  0.723  0.765  1.0
  O  O29  1  0.346  0.038  0.104  1.0
  O  O30  1  0.654  0.962  0.896  1.0
  O  O31  1  0.260  0.925  0.365  1.0
  O  O32  1  0.977  0.936  0.884  1.0
  O  O33  1  0.647  0.696  0.941  1.0
  O  O34  1  0.740  0.075  0.635  1.0
  O  O35  1  0.546  0.534  0.086  1.0
  O  O36  1  0.454  0.466  0.914  1.0
  O  O37  1  0.304  0.353  0.559  1.0
  O  O38  1  0.829  0.734  0.096  1.0
  O  O39  1  0.734  0.829  0.596  1.0
  O  O40  1  0.023  0.064  0.116  1.0
  O  O41  1  0.266  0.171  0.404  1.0
  O  O42  1  0.277  0.542  0.735  1.0
  O  O43  1  0.038  0.346  0.604  1.0
[/CIF]
.