The material structure described by Sr2U4O11 crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a distorted hexagonal planar geometry to one O(11), one O(2), one O(4), one O(7), and two equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(6), one O(9), two equivalent O(10), and two equivalent O(2) atoms. There are four inequivalent U sites. In the first U site, U(1) is bonded in a body-centered cubic geometry to one O(1), one O(11), one O(4), one O(9), two equivalent O(5), and two equivalent O(8) atoms. In the second U site, U(2) is bonded in a body-centered cubic geometry to one O(10), one O(3), one O(5), one O(8), two equivalent O(4), and two equivalent O(9) atoms. In the third U site, U(3) is bonded in a distorted body-centered cubic geometry to one O(10), one O(2), one O(5), one O(7), two equivalent O(1), and two equivalent O(6) atoms. In the fourth U site, U(4) is bonded in a 7-coordinate geometry to one O(3), one O(6), one O(8), two equivalent O(11), and two equivalent O(7) atoms. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to one Sr(2), one U(1), and two equivalent U(3) atoms to form OSrU3 tetrahedra that share  a cornercorner with one O(11)SrU3 tetrahedra,  a cornercorner with one O(4)SrU3 tetrahedra, corners with two equivalent O(1)SrU3 tetrahedra, corners with two equivalent O(7)SrU3 tetrahedra, corners with two equivalent O(8)U4 tetrahedra, corners with three equivalent O(6)SrU3 tetrahedra, corners with four equivalent O(10)Sr2U2 tetrahedra,  an edgeedge with one O(6)SrU3 tetrahedra,  an edgeedge with one O(9)SrU3 tetrahedra, edges with two equivalent O(2)Sr3U tetrahedra, and edges with two equivalent O(5)U4 tetrahedra. In the second O site, O(2) is bonded to one Sr(1), two equivalent Sr(2), and one U(3) atom to form OSr3U tetrahedra that share  a cornercorner with one O(11)SrU3 tetrahedra,  a cornercorner with one O(4)SrU3 tetrahedra,  a cornercorner with one O(5)U4 tetrahedra, corners with two equivalent O(3)Sr2U2 tetrahedra, corners with two equivalent O(2)Sr3U tetrahedra, corners with two equivalent O(9)SrU3 tetrahedra, corners with three equivalent O(10)Sr2U2 tetrahedra, corners with four equivalent O(6)SrU3 tetrahedra,  an edgeedge with one O(10)Sr2U2 tetrahedra,  an edgeedge with one O(7)SrU3 tetrahedra, and edges with two equivalent O(1)SrU3 tetrahedra. In the third O site, O(3) is bonded to two equivalent Sr(1), one U(2), and one U(4) atom to form OSr2U2 tetrahedra that share  a cornercorner with one O(10)Sr2U2 tetrahedra,  a cornercorner with one O(6)SrU3 tetrahedra,  a cornercorner with one O(5)U4 tetrahedra, corners with two equivalent O(3)Sr2U2 tetrahedra, corners with two equivalent O(2)Sr3U tetrahedra, corners with two equivalent O(9)SrU3 tetrahedra, corners with four equivalent O(11)SrU3 tetrahedra,  an edgeedge with one O(8)U4 tetrahedra, edges with two equivalent O(4)SrU3 tetrahedra, and edges with two equivalent O(7)SrU3 tetrahedra. In the fourth O site, O(4) is bonded to one Sr(1), one U(1), and two equivalent U(2) atoms to form OSrU3 tetrahedra that share  a cornercorner with one O(2)Sr3U tetrahedra,  a cornercorner with one O(1)SrU3 tetrahedra,  a cornercorner with one O(7)SrU3 tetrahedra, corners with two equivalent O(10)Sr2U2 tetrahedra, corners with two equivalent O(4)SrU3 tetrahedra, corners with three equivalent O(9)SrU3 tetrahedra, corners with four equivalent O(8)U4 tetrahedra,  an edgeedge with one O(11)SrU3 tetrahedra,  an edgeedge with one O(9)SrU3 tetrahedra, edges with two equivalent O(3)Sr2U2 tetrahedra, and edges with two equivalent O(5)U4 tetrahedra. In the fifth O site, O(5) is bonded to one U(2), one U(3), and two equivalent U(1) atoms to form OU4 tetrahedra that share  a cornercorner with one O(3)Sr2U2 tetrahedra,  a cornercorner with one O(2)Sr3U tetrahedra,  a cornercorner with one O(7)SrU3 tetrahedra, corners with two equivalent O(11)SrU3 tetrahedra, corners with two equivalent O(6)SrU3 tetrahedra, corners with two equivalent O(5)U4 tetrahedra, corners with three equivalent O(8)U4 tetrahedra, corners with four equivalent O(9)SrU3 tetrahedra,  an edgeedge with one O(10)Sr2U2 tetrahedra,  an edgeedge with one O(8)U4 tetrahedra, edges with two equivalent O(1)SrU3 tetrahedra, and edges with two equivalent O(4)SrU3 tetrahedra. In the sixth O site, O(6) is bonded to one Sr(2), one U(4), and two equivalent U(3) atoms to form OSrU3 tetrahedra that share  a cornercorner with one O(3)Sr2U2 tetrahedra,  a cornercorner with one O(9)SrU3 tetrahedra,  a cornercorner with one O(8)U4 tetrahedra, corners with two equivalent O(11)SrU3 tetrahedra, corners with two equivalent O(6)SrU3 tetrahedra, corners with two equivalent O(5)U4 tetrahedra, corners with three equivalent O(1)SrU3 tetrahedra, corners with four equivalent O(2)Sr3U tetrahedra,  an edgeedge with one O(1)SrU3 tetrahedra, edges with two equivalent O(10)Sr2U2 tetrahedra, and edges with two equivalent O(7)SrU3 tetrahedra. In the seventh O site, O(7) is bonded to one Sr(1), one U(3), and two equivalent U(4) atoms to form OSrU3 tetrahedra that share  a cornercorner with one O(10)Sr2U2 tetrahedra,  a cornercorner with one O(4)SrU3 tetrahedra,  a cornercorner with one O(5)U4 tetrahedra, corners with two equivalent O(1)SrU3 tetrahedra, corners with two equivalent O(7)SrU3 tetrahedra, corners with two equivalent O(8)U4 tetrahedra, corners with three equivalent O(11)SrU3 tetrahedra,  an edgeedge with one O(2)Sr3U tetrahedra,  an edgeedge with one O(11)SrU3 tetrahedra, edges with two equivalent O(3)Sr2U2 tetrahedra, and edges with two equivalent O(6)SrU3 tetrahedra. In the eighth O site, O(8) is bonded to one U(2), one U(4), and two equivalent U(1) atoms to form OU4 tetrahedra that share  a cornercorner with one O(10)Sr2U2 tetrahedra,  a cornercorner with one O(6)SrU3 tetrahedra, corners with two equivalent O(1)SrU3 tetrahedra, corners with two equivalent O(7)SrU3 tetrahedra, corners with two equivalent O(8)U4 tetrahedra, corners with three equivalent O(5)U4 tetrahedra, corners with four equivalent O(4)SrU3 tetrahedra,  an edgeedge with one O(3)Sr2U2 tetrahedra,  an edgeedge with one O(5)U4 tetrahedra, edges with two equivalent O(11)SrU3 tetrahedra, and edges with two equivalent O(9)SrU3 tetrahedra. In the ninth O site, O(9) is bonded to one Sr(2), one U(1), and two equivalent U(2) atoms to form OSrU3 tetrahedra that share  a cornercorner with one O(11)SrU3 tetrahedra,  a cornercorner with one O(6)SrU3 tetrahedra, corners with two equivalent O(3)Sr2U2 tetrahedra, corners with two equivalent O(2)Sr3U tetrahedra, corners with two equivalent O(9)SrU3 tetrahedra, corners with three equivalent O(4)SrU3 tetrahedra, corners with four equivalent O(5)U4 tetrahedra,  an edgeedge with one O(1)SrU3 tetrahedra,  an edgeedge with one O(4)SrU3 tetrahedra, edges with two equivalent O(10)Sr2U2 tetrahedra, and edges with two equivalent O(8)U4 tetrahedra. In the tenth O site, O(10) is bonded to two equivalent Sr(2), one U(2), and one U(3) atom to form OSr2U2 tetrahedra that share  a cornercorner with one O(3)Sr2U2 tetrahedra,  a cornercorner with one O(7)SrU3 tetrahedra,  a cornercorner with one O(8)U4 tetrahedra, corners with two equivalent O(10)Sr2U2 tetrahedra, corners with two equivalent O(4)SrU3 tetrahedra, corners with three equivalent O(2)Sr3U tetrahedra, corners with four equivalent O(1)SrU3 tetrahedra,  an edgeedge with one O(2)Sr3U tetrahedra,  an edgeedge with one O(5)U4 tetrahedra, edges with two equivalent O(6)SrU3 tetrahedra, and edges with two equivalent O(9)SrU3 tetrahedra. In the eleventh O site, O(11) is bonded to one Sr(1), one U(1), and two equivalent U(4) atoms to form OSrU3 tetrahedra that share  a cornercorner with one O(2)Sr3U tetrahedra,  a cornercorner with one O(1)SrU3 tetrahedra,  a cornercorner with one O(9)SrU3 tetrahedra, corners with two equivalent O(11)SrU3 tetrahedra, corners with two equivalent O(6)SrU3 tetrahedra, corners with two equivalent O(5)U4 tetrahedra, corners with three equivalent O(7)SrU3 tetrahedra, corners with four equivalent O(3)Sr2U2 tetrahedra,  an edgeedge with one O(4)SrU3 tetrahedra,  an edgeedge with one O(7)SrU3 tetrahedra, and edges with two equivalent O(8)U4 tetrahedra. is represented by the CIF card [CIF]
data_Sr2U4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.219
_cell_length_b   10.219
_cell_length_c   6.824
_cell_angle_alpha   70.762
_cell_angle_beta   70.762
_cell_angle_gamma   21.710
_symmetry_Int_Tables_number   1
_cell_volume   248.339
_cell_formula_units_Z   1
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  0.835  0.835  0.504  1.0
  Sr  Sr1  1  0.159  0.159  0.512  1.0
  U  U2  1  0.997  0.997  0.004  1.0
  U  U3  1  0.500  0.500  0.491  1.0
  U  U4  1  0.667  0.667  0.995  1.0
  U  U5  1  0.336  0.336  0.971  1.0
  O  O6  1  0.118  0.118  0.916  1.0
  O  O7  1  0.705  0.705  0.666  1.0
  O  O8  1  0.383  0.383  0.623  1.0
  O  O9  1  0.968  0.968  0.355  1.0
  O  O10  1  0.535  0.535  0.113  1.0
  O  O11  1  0.219  0.219  0.110  1.0
  O  O12  1  0.795  0.795  0.882  1.0
  O  O13  1  0.455  0.455  0.883  1.0
  O  O14  1  0.031  0.031  0.642  1.0
  O  O15  1  0.616  0.616  0.345  1.0
  O  O16  1  0.871  0.871  0.120  1.0
[/CIF]
.
The material structure described by Sr2U4O11 crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a distorted hexagonal planar geometry to one O(11), one O(2), one O(4), one O(7), and two equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(6), one O(9), two equivalent O(10), and two equivalent O(2) atoms. There are four inequivalent U sites. In the first U site, U(1) is bonded in a body-centered cubic geometry to one O(1), one O(11), one O(4), one O(9), two equivalent O(5), and two equivalent O(8) atoms. In the second U site, U(2) is bonded in a body-centered cubic geometry to one O(10), one O(3), one O(5), one O(8), two equivalent O(4), and two equivalent O(9) atoms. In the third U site, U(3) is bonded in a distorted body-centered cubic geometry to one O(10), one O(2), one O(5), one O(7), two equivalent O(1), and two equivalent O(6) atoms. In the fourth U site, U(4) is bonded in a 7-coordinate geometry to one O(3), one O(6), one O(8), two equivalent O(11), and two equivalent O(7) atoms. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to one Sr(2), one U(1), and two equivalent U(3) atoms to form OSrU3 tetrahedra that share  a cornercorner with one O(11)SrU3 tetrahedra,  a cornercorner with one O(4)SrU3 tetrahedra, corners with two equivalent O(1)SrU3 tetrahedra, corners with two equivalent O(7)SrU3 tetrahedra, corners with two equivalent O(8)U4 tetrahedra, corners with three equivalent O(6)SrU3 tetrahedra, corners with four equivalent O(10)Sr2U2 tetrahedra,  an edgeedge with one O(6)SrU3 tetrahedra,  an edgeedge with one O(9)SrU3 tetrahedra, edges with two equivalent O(2)Sr3U tetrahedra, and edges with two equivalent O(5)U4 tetrahedra. In the second O site, O(2) is bonded to one Sr(1), two equivalent Sr(2), and one U(3) atom to form OSr3U tetrahedra that share  a cornercorner with one O(11)SrU3 tetrahedra,  a cornercorner with one O(4)SrU3 tetrahedra,  a cornercorner with one O(5)U4 tetrahedra, corners with two equivalent O(3)Sr2U2 tetrahedra, corners with two equivalent O(2)Sr3U tetrahedra, corners with two equivalent O(9)SrU3 tetrahedra, corners with three equivalent O(10)Sr2U2 tetrahedra, corners with four equivalent O(6)SrU3 tetrahedra,  an edgeedge with one O(10)Sr2U2 tetrahedra,  an edgeedge with one O(7)SrU3 tetrahedra, and edges with two equivalent O(1)SrU3 tetrahedra. In the third O site, O(3) is bonded to two equivalent Sr(1), one U(2), and one U(4) atom to form OSr2U2 tetrahedra that share  a cornercorner with one O(10)Sr2U2 tetrahedra,  a cornercorner with one O(6)SrU3 tetrahedra,  a cornercorner with one O(5)U4 tetrahedra, corners with two equivalent O(3)Sr2U2 tetrahedra, corners with two equivalent O(2)Sr3U tetrahedra, corners with two equivalent O(9)SrU3 tetrahedra, corners with four equivalent O(11)SrU3 tetrahedra,  an edgeedge with one O(8)U4 tetrahedra, edges with two equivalent O(4)SrU3 tetrahedra, and edges with two equivalent O(7)SrU3 tetrahedra. In the fourth O site, O(4) is bonded to one Sr(1), one U(1), and two equivalent U(2) atoms to form OSrU3 tetrahedra that share  a cornercorner with one O(2)Sr3U tetrahedra,  a cornercorner with one O(1)SrU3 tetrahedra,  a cornercorner with one O(7)SrU3 tetrahedra, corners with two equivalent O(10)Sr2U2 tetrahedra, corners with two equivalent O(4)SrU3 tetrahedra, corners with three equivalent O(9)SrU3 tetrahedra, corners with four equivalent O(8)U4 tetrahedra,  an edgeedge with one O(11)SrU3 tetrahedra,  an edgeedge with one O(9)SrU3 tetrahedra, edges with two equivalent O(3)Sr2U2 tetrahedra, and edges with two equivalent O(5)U4 tetrahedra. In the fifth O site, O(5) is bonded to one U(2), one U(3), and two equivalent U(1) atoms to form OU4 tetrahedra that share  a cornercorner with one O(3)Sr2U2 tetrahedra,  a cornercorner with one O(2)Sr3U tetrahedra,  a cornercorner with one O(7)SrU3 tetrahedra, corners with two equivalent O(11)SrU3 tetrahedra, corners with two equivalent O(6)SrU3 tetrahedra, corners with two equivalent O(5)U4 tetrahedra, corners with three equivalent O(8)U4 tetrahedra, corners with four equivalent O(9)SrU3 tetrahedra,  an edgeedge with one O(10)Sr2U2 tetrahedra,  an edgeedge with one O(8)U4 tetrahedra, edges with two equivalent O(1)SrU3 tetrahedra, and edges with two equivalent O(4)SrU3 tetrahedra. In the sixth O site, O(6) is bonded to one Sr(2), one U(4), and two equivalent U(3) atoms to form OSrU3 tetrahedra that share  a cornercorner with one O(3)Sr2U2 tetrahedra,  a cornercorner with one O(9)SrU3 tetrahedra,  a cornercorner with one O(8)U4 tetrahedra, corners with two equivalent O(11)SrU3 tetrahedra, corners with two equivalent O(6)SrU3 tetrahedra, corners with two equivalent O(5)U4 tetrahedra, corners with three equivalent O(1)SrU3 tetrahedra, corners with four equivalent O(2)Sr3U tetrahedra,  an edgeedge with one O(1)SrU3 tetrahedra, edges with two equivalent O(10)Sr2U2 tetrahedra, and edges with two equivalent O(7)SrU3 tetrahedra. In the seventh O site, O(7) is bonded to one Sr(1), one U(3), and two equivalent U(4) atoms to form OSrU3 tetrahedra that share  a cornercorner with one O(10)Sr2U2 tetrahedra,  a cornercorner with one O(4)SrU3 tetrahedra,  a cornercorner with one O(5)U4 tetrahedra, corners with two equivalent O(1)SrU3 tetrahedra, corners with two equivalent O(7)SrU3 tetrahedra, corners with two equivalent O(8)U4 tetrahedra, corners with three equivalent O(11)SrU3 tetrahedra,  an edgeedge with one O(2)Sr3U tetrahedra,  an edgeedge with one O(11)SrU3 tetrahedra, edges with two equivalent O(3)Sr2U2 tetrahedra, and edges with two equivalent O(6)SrU3 tetrahedra. In the eighth O site, O(8) is bonded to one U(2), one U(4), and two equivalent U(1) atoms to form OU4 tetrahedra that share  a cornercorner with one O(10)Sr2U2 tetrahedra,  a cornercorner with one O(6)SrU3 tetrahedra, corners with two equivalent O(1)SrU3 tetrahedra, corners with two equivalent O(7)SrU3 tetrahedra, corners with two equivalent O(8)U4 tetrahedra, corners with three equivalent O(5)U4 tetrahedra, corners with four equivalent O(4)SrU3 tetrahedra,  an edgeedge with one O(3)Sr2U2 tetrahedra,  an edgeedge with one O(5)U4 tetrahedra, edges with two equivalent O(11)SrU3 tetrahedra, and edges with two equivalent O(9)SrU3 tetrahedra. In the ninth O site, O(9) is bonded to one Sr(2), one U(1), and two equivalent U(2) atoms to form OSrU3 tetrahedra that share  a cornercorner with one O(11)SrU3 tetrahedra,  a cornercorner with one O(6)SrU3 tetrahedra, corners with two equivalent O(3)Sr2U2 tetrahedra, corners with two equivalent O(2)Sr3U tetrahedra, corners with two equivalent O(9)SrU3 tetrahedra, corners with three equivalent O(4)SrU3 tetrahedra, corners with four equivalent O(5)U4 tetrahedra,  an edgeedge with one O(1)SrU3 tetrahedra,  an edgeedge with one O(4)SrU3 tetrahedra, edges with two equivalent O(10)Sr2U2 tetrahedra, and edges with two equivalent O(8)U4 tetrahedra. In the tenth O site, O(10) is bonded to two equivalent Sr(2), one U(2), and one U(3) atom to form OSr2U2 tetrahedra that share  a cornercorner with one O(3)Sr2U2 tetrahedra,  a cornercorner with one O(7)SrU3 tetrahedra,  a cornercorner with one O(8)U4 tetrahedra, corners with two equivalent O(10)Sr2U2 tetrahedra, corners with two equivalent O(4)SrU3 tetrahedra, corners with three equivalent O(2)Sr3U tetrahedra, corners with four equivalent O(1)SrU3 tetrahedra,  an edgeedge with one O(2)Sr3U tetrahedra,  an edgeedge with one O(5)U4 tetrahedra, edges with two equivalent O(6)SrU3 tetrahedra, and edges with two equivalent O(9)SrU3 tetrahedra. In the eleventh O site, O(11) is bonded to one Sr(1), one U(1), and two equivalent U(4) atoms to form OSrU3 tetrahedra that share  a cornercorner with one O(2)Sr3U tetrahedra,  a cornercorner with one O(1)SrU3 tetrahedra,  a cornercorner with one O(9)SrU3 tetrahedra, corners with two equivalent O(11)SrU3 tetrahedra, corners with two equivalent O(6)SrU3 tetrahedra, corners with two equivalent O(5)U4 tetrahedra, corners with three equivalent O(7)SrU3 tetrahedra, corners with four equivalent O(3)Sr2U2 tetrahedra,  an edgeedge with one O(4)SrU3 tetrahedra,  an edgeedge with one O(7)SrU3 tetrahedra, and edges with two equivalent O(8)U4 tetrahedra. is represented by the CIF card [CIF]
data_Sr2U4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.219
_cell_length_b   10.219
_cell_length_c   6.824
_cell_angle_alpha   70.762
_cell_angle_beta   70.762
_cell_angle_gamma   21.710
_symmetry_Int_Tables_number   1
_cell_volume   248.339
_cell_formula_units_Z   1
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  0.835  0.835  0.504  1.0
  Sr  Sr1  1  0.159  0.159  0.512  1.0
  U  U2  1  0.997  0.997  0.004  1.0
  U  U3  1  0.500  0.500  0.491  1.0
  U  U4  1  0.667  0.667  0.995  1.0
  U  U5  1  0.336  0.336  0.971  1.0
  O  O6  1  0.118  0.118  0.916  1.0
  O  O7  1  0.705  0.705  0.666  1.0
  O  O8  1  0.383  0.383  0.623  1.0
  O  O9  1  0.968  0.968  0.355  1.0
  O  O10  1  0.535  0.535  0.113  1.0
  O  O11  1  0.219  0.219  0.110  1.0
  O  O12  1  0.795  0.795  0.882  1.0
  O  O13  1  0.455  0.455  0.883  1.0
  O  O14  1  0.031  0.031  0.642  1.0
  O  O15  1  0.616  0.616  0.345  1.0
  O  O16  1  0.871  0.871  0.120  1.0
[/CIF]
.