The structure described by U9ZrO20 is Fluorite-derived structured and crystallizes in the triclinic P-1 space group. There are five inequivalent U sites. In the first U site, U(1) is bonded in a body-centered cubic geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms. In the second U site, U(2) is bonded in a body-centered cubic geometry to one O(2), one O(4), one O(5), one O(6), one O(8), one O(9), and two equivalent O(1) atoms. In the third U site, U(3) is bonded in a body-centered cubic geometry to one O(1), one O(10), one O(3), one O(5), one O(6), one O(7), and two equivalent O(2) atoms. In the fourth U site, U(4) is bonded in a body-centered cubic geometry to one O(3), one O(7), one O(8), one O(9), two equivalent O(10), and two equivalent O(6) atoms. In the fifth U site, U(5) is bonded in a body-centered cubic geometry to one O(10), one O(4), one O(7), one O(8), two equivalent O(5), and two equivalent O(9) atoms. Zr(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(3), two equivalent O(4), and two equivalent O(8) atoms. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one U(3), two equivalent U(2), and one Zr(1) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(10)U4 tetrahedra,  a cornercorner with one O(6)U4 tetrahedra,  a cornercorner with one O(7)U4 tetrahedra,  a cornercorner with one O(1)ZrU3 tetrahedra,  a cornercorner with one O(3)ZrU3 tetrahedra, corners with two equivalent O(2)U4 tetrahedra, corners with two equivalent O(9)U4 tetrahedra, corners with two equivalent O(4)ZrU3 tetrahedra, corners with two equivalent O(8)ZrU3 tetrahedra, corners with three equivalent O(5)U4 tetrahedra,  an edgeedge with one O(2)U4 tetrahedra,  an edgeedge with one O(6)U4 tetrahedra,  an edgeedge with one O(1)ZrU3 tetrahedra,  an edgeedge with one O(3)ZrU3 tetrahedra,  an edgeedge with one O(4)ZrU3 tetrahedra, and  an edgeedge with one O(8)ZrU3 tetrahedra. In the second O site, O(2) is bonded to one U(1), one U(2), and two equivalent U(3) atoms to form OU4 tetrahedra that share  a cornercorner with one O(2)U4 tetrahedra,  a cornercorner with one O(5)U4 tetrahedra,  a cornercorner with one O(9)U4 tetrahedra,  a cornercorner with one O(4)ZrU3 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(10)U4 tetrahedra, corners with two equivalent O(7)U4 tetrahedra, corners with two equivalent O(1)ZrU3 tetrahedra, corners with two equivalent O(3)ZrU3 tetrahedra, corners with three equivalent O(6)U4 tetrahedra,  an edgeedge with one O(2)U4 tetrahedra,  an edgeedge with one O(5)U4 tetrahedra,  an edgeedge with one O(7)U4 tetrahedra,  an edgeedge with one O(1)ZrU3 tetrahedra,  an edgeedge with one O(3)ZrU3 tetrahedra, and  an edgeedge with one O(4)ZrU3 tetrahedra. In the third O site, O(3) is bonded to one U(1), one U(3), one U(4), and one Zr(1) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(10)U4 tetrahedra,  a cornercorner with one O(5)U4 tetrahedra,  a cornercorner with one O(9)U4 tetrahedra,  a cornercorner with one O(1)ZrU3 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(2)U4 tetrahedra, corners with two equivalent O(7)U4 tetrahedra, corners with two equivalent O(3)ZrU3 tetrahedra, corners with two equivalent O(4)ZrU3 tetrahedra, corners with three equivalent O(6)U4 tetrahedra,  an edgeedge with one O(10)U4 tetrahedra,  an edgeedge with one O(2)U4 tetrahedra,  an edgeedge with one O(7)U4 tetrahedra,  an edgeedge with one O(1)ZrU3 tetrahedra,  an edgeedge with one O(4)ZrU3 tetrahedra, and  an edgeedge with one O(8)ZrU3 tetrahedra. In the fourth O site, O(4) is bonded to one U(1), one U(2), one U(5), and one Zr(1) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(10)U4 tetrahedra,  a cornercorner with one O(2)U4 tetrahedra,  a cornercorner with one O(6)U4 tetrahedra,  a cornercorner with one O(7)U4 tetrahedra,  a cornercorner with one O(9)U4 tetrahedra, corners with two equivalent O(1)ZrU3 tetrahedra, corners with two equivalent O(3)ZrU3 tetrahedra, corners with two equivalent O(4)ZrU3 tetrahedra, corners with two equivalent O(8)ZrU3 tetrahedra, corners with three equivalent O(5)U4 tetrahedra,  an edgeedge with one O(2)U4 tetrahedra,  an edgeedge with one O(7)U4 tetrahedra,  an edgeedge with one O(9)U4 tetrahedra,  an edgeedge with one O(1)ZrU3 tetrahedra,  an edgeedge with one O(3)ZrU3 tetrahedra, and  an edgeedge with one O(8)ZrU3 tetrahedra. In the fifth O site, O(5) is bonded to one U(2), one U(3), and two equivalent U(5) atoms to form OU4 tetrahedra that share  a cornercorner with one O(10)U4 tetrahedra,  a cornercorner with one O(2)U4 tetrahedra,  a cornercorner with one O(7)U4 tetrahedra,  a cornercorner with one O(3)ZrU3 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(6)U4 tetrahedra, corners with three equivalent O(9)U4 tetrahedra, corners with three equivalent O(1)ZrU3 tetrahedra, corners with three equivalent O(4)ZrU3 tetrahedra,  an edgeedge with one O(10)U4 tetrahedra,  an edgeedge with one O(2)U4 tetrahedra,  an edgeedge with one O(5)U4 tetrahedra,  an edgeedge with one O(7)U4 tetrahedra,  an edgeedge with one O(9)U4 tetrahedra, and  an edgeedge with one O(8)ZrU3 tetrahedra. In the sixth O site, O(6) is bonded to one U(2), one U(3), and two equivalent U(4) atoms to form OU4 tetrahedra that share  a cornercorner with one O(7)U4 tetrahedra,  a cornercorner with one O(9)U4 tetrahedra,  a cornercorner with one O(1)ZrU3 tetrahedra,  a cornercorner with one O(4)ZrU3 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(5)U4 tetrahedra, corners with three equivalent O(10)U4 tetrahedra, corners with three equivalent O(2)U4 tetrahedra, corners with three equivalent O(3)ZrU3 tetrahedra,  an edgeedge with one O(10)U4 tetrahedra,  an edgeedge with one O(6)U4 tetrahedra,  an edgeedge with one O(7)U4 tetrahedra,  an edgeedge with one O(9)U4 tetrahedra,  an edgeedge with one O(1)ZrU3 tetrahedra, and  an edgeedge with one O(8)ZrU3 tetrahedra. In the seventh O site, O(7) is bonded to one U(1), one U(3), one U(4), and one U(5) atom to form OU4 tetrahedra that share  a cornercorner with one O(5)U4 tetrahedra,  a cornercorner with one O(6)U4 tetrahedra,  a cornercorner with one O(7)U4 tetrahedra,  a cornercorner with one O(9)U4 tetrahedra,  a cornercorner with one O(1)ZrU3 tetrahedra,  a cornercorner with one O(4)ZrU3 tetrahedra, corners with two equivalent O(2)U4 tetrahedra, corners with two equivalent O(3)ZrU3 tetrahedra, corners with two equivalent O(8)ZrU3 tetrahedra, corners with four equivalent O(10)U4 tetrahedra,  an edgeedge with one O(2)U4 tetrahedra,  an edgeedge with one O(5)U4 tetrahedra,  an edgeedge with one O(6)U4 tetrahedra,  an edgeedge with one O(9)U4 tetrahedra,  an edgeedge with one O(3)ZrU3 tetrahedra, and  an edgeedge with one O(4)ZrU3 tetrahedra. In the eighth O site, O(8) is bonded to one U(2), one U(4), one U(5), and one Zr(1) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(10)U4 tetrahedra,  a cornercorner with one O(2)U4 tetrahedra,  a cornercorner with one O(5)U4 tetrahedra,  a cornercorner with one O(6)U4 tetrahedra,  a cornercorner with one O(3)ZrU3 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(7)U4 tetrahedra, corners with two equivalent O(1)ZrU3 tetrahedra, corners with two equivalent O(4)ZrU3 tetrahedra, corners with four equivalent O(9)U4 tetrahedra,  an edgeedge with one O(10)U4 tetrahedra,  an edgeedge with one O(5)U4 tetrahedra,  an edgeedge with one O(6)U4 tetrahedra,  an edgeedge with one O(1)ZrU3 tetrahedra,  an edgeedge with one O(3)ZrU3 tetrahedra, and  an edgeedge with one O(4)ZrU3 tetrahedra. In the ninth O site, O(9) is bonded to one U(2), one U(4), and two equivalent U(5) atoms to form OU4 tetrahedra that share  a cornercorner with one O(2)U4 tetrahedra,  a cornercorner with one O(6)U4 tetrahedra,  a cornercorner with one O(7)U4 tetrahedra,  a cornercorner with one O(3)ZrU3 tetrahedra,  a cornercorner with one O(4)ZrU3 tetrahedra, corners with two equivalent O(10)U4 tetrahedra, corners with two equivalent O(1)ZrU3 tetrahedra, corners with three equivalent O(5)U4 tetrahedra, corners with four equivalent O(8)ZrU3 tetrahedra,  an edgeedge with one O(10)U4 tetrahedra,  an edgeedge with one O(5)U4 tetrahedra,  an edgeedge with one O(6)U4 tetrahedra,  an edgeedge with one O(7)U4 tetrahedra,  an edgeedge with one O(9)U4 tetrahedra, and  an edgeedge with one O(4)ZrU3 tetrahedra. In the tenth O site, O(10) is bonded to one U(3), one U(5), and two equivalent U(4) atoms to form OU4 tetrahedra that share  a cornercorner with one O(5)U4 tetrahedra,  a cornercorner with one O(1)ZrU3 tetrahedra,  a cornercorner with one O(3)ZrU3 tetrahedra,  a cornercorner with one O(4)ZrU3 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(2)U4 tetrahedra, corners with two equivalent O(9)U4 tetrahedra, corners with three equivalent O(6)U4 tetrahedra, corners with four equivalent O(7)U4 tetrahedra,  an edgeedge with one O(10)U4 tetrahedra,  an edgeedge with one O(5)U4 tetrahedra,  an edgeedge with one O(6)U4 tetrahedra,  an edgeedge with one O(9)U4 tetrahedra,  an edgeedge with one O(3)ZrU3 tetrahedra, and  an edgeedge with one O(8)ZrU3 tetrahedra. is represented by the CIF card [CIF]
data_ZrU9O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.606
_cell_length_b   7.631
_cell_length_c   8.529
_cell_angle_alpha   102.923
_cell_angle_beta   97.431
_cell_angle_gamma   106.781
_symmetry_Int_Tables_number   1
_cell_volume   392.478
_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
  Zr  Zr0  1  0.000  0.000  0.000  1.0
  U  U1  1  0.000  0.500  0.000  1.0
  U  U2  1  0.401  0.801  0.801  1.0
  U  U3  1  0.398  0.299  0.801  1.0
  U  U4  1  0.801  0.100  0.602  1.0
  U  U5  1  0.801  0.601  0.602  1.0
  U  U6  1  0.199  0.399  0.398  1.0
  U  U7  1  0.199  0.900  0.398  1.0
  U  U8  1  0.602  0.701  0.199  1.0
  U  U9  1  0.599  0.199  0.199  1.0
  O  O10  1  0.341  0.072  0.952  1.0
  O  O11  1  0.349  0.575  0.949  1.0
  O  O12  1  0.049  0.219  0.854  1.0
  O  O13  1  0.050  0.732  0.854  1.0
  O  O14  1  0.450  0.525  0.650  1.0
  O  O15  1  0.451  0.025  0.651  1.0
  O  O16  1  0.752  0.376  0.751  1.0
  O  O17  1  0.757  0.879  0.757  1.0
  O  O18  1  0.150  0.675  0.550  1.0
  O  O19  1  0.151  0.175  0.550  1.0
  O  O20  1  0.850  0.325  0.450  1.0
  O  O21  1  0.550  0.474  0.350  1.0
  O  O22  1  0.549  0.975  0.349  1.0
  O  O23  1  0.849  0.825  0.450  1.0
  O  O24  1  0.243  0.121  0.243  1.0
  O  O25  1  0.248  0.624  0.249  1.0
  O  O26  1  0.651  0.425  0.051  1.0
  O  O27  1  0.659  0.928  0.048  1.0
  O  O28  1  0.950  0.268  0.146  1.0
  O  O29  1  0.951  0.781  0.146  1.0
[/CIF]
.
The structure described by U9ZrO20 is Fluorite-derived structured and crystallizes in the triclinic P-1 space group. There are five inequivalent U sites. In the first U site, U(1) is bonded in a body-centered cubic geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms. In the second U site, U(2) is bonded in a body-centered cubic geometry to one O(2), one O(4), one O(5), one O(6), one O(8), one O(9), and two equivalent O(1) atoms. In the third U site, U(3) is bonded in a body-centered cubic geometry to one O(1), one O(10), one O(3), one O(5), one O(6), one O(7), and two equivalent O(2) atoms. In the fourth U site, U(4) is bonded in a body-centered cubic geometry to one O(3), one O(7), one O(8), one O(9), two equivalent O(10), and two equivalent O(6) atoms. In the fifth U site, U(5) is bonded in a body-centered cubic geometry to one O(10), one O(4), one O(7), one O(8), two equivalent O(5), and two equivalent O(9) atoms. Zr(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(3), two equivalent O(4), and two equivalent O(8) atoms. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one U(3), two equivalent U(2), and one Zr(1) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(10)U4 tetrahedra,  a cornercorner with one O(6)U4 tetrahedra,  a cornercorner with one O(7)U4 tetrahedra,  a cornercorner with one O(1)ZrU3 tetrahedra,  a cornercorner with one O(3)ZrU3 tetrahedra, corners with two equivalent O(2)U4 tetrahedra, corners with two equivalent O(9)U4 tetrahedra, corners with two equivalent O(4)ZrU3 tetrahedra, corners with two equivalent O(8)ZrU3 tetrahedra, corners with three equivalent O(5)U4 tetrahedra,  an edgeedge with one O(2)U4 tetrahedra,  an edgeedge with one O(6)U4 tetrahedra,  an edgeedge with one O(1)ZrU3 tetrahedra,  an edgeedge with one O(3)ZrU3 tetrahedra,  an edgeedge with one O(4)ZrU3 tetrahedra, and  an edgeedge with one O(8)ZrU3 tetrahedra. In the second O site, O(2) is bonded to one U(1), one U(2), and two equivalent U(3) atoms to form OU4 tetrahedra that share  a cornercorner with one O(2)U4 tetrahedra,  a cornercorner with one O(5)U4 tetrahedra,  a cornercorner with one O(9)U4 tetrahedra,  a cornercorner with one O(4)ZrU3 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(10)U4 tetrahedra, corners with two equivalent O(7)U4 tetrahedra, corners with two equivalent O(1)ZrU3 tetrahedra, corners with two equivalent O(3)ZrU3 tetrahedra, corners with three equivalent O(6)U4 tetrahedra,  an edgeedge with one O(2)U4 tetrahedra,  an edgeedge with one O(5)U4 tetrahedra,  an edgeedge with one O(7)U4 tetrahedra,  an edgeedge with one O(1)ZrU3 tetrahedra,  an edgeedge with one O(3)ZrU3 tetrahedra, and  an edgeedge with one O(4)ZrU3 tetrahedra. In the third O site, O(3) is bonded to one U(1), one U(3), one U(4), and one Zr(1) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(10)U4 tetrahedra,  a cornercorner with one O(5)U4 tetrahedra,  a cornercorner with one O(9)U4 tetrahedra,  a cornercorner with one O(1)ZrU3 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(2)U4 tetrahedra, corners with two equivalent O(7)U4 tetrahedra, corners with two equivalent O(3)ZrU3 tetrahedra, corners with two equivalent O(4)ZrU3 tetrahedra, corners with three equivalent O(6)U4 tetrahedra,  an edgeedge with one O(10)U4 tetrahedra,  an edgeedge with one O(2)U4 tetrahedra,  an edgeedge with one O(7)U4 tetrahedra,  an edgeedge with one O(1)ZrU3 tetrahedra,  an edgeedge with one O(4)ZrU3 tetrahedra, and  an edgeedge with one O(8)ZrU3 tetrahedra. In the fourth O site, O(4) is bonded to one U(1), one U(2), one U(5), and one Zr(1) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(10)U4 tetrahedra,  a cornercorner with one O(2)U4 tetrahedra,  a cornercorner with one O(6)U4 tetrahedra,  a cornercorner with one O(7)U4 tetrahedra,  a cornercorner with one O(9)U4 tetrahedra, corners with two equivalent O(1)ZrU3 tetrahedra, corners with two equivalent O(3)ZrU3 tetrahedra, corners with two equivalent O(4)ZrU3 tetrahedra, corners with two equivalent O(8)ZrU3 tetrahedra, corners with three equivalent O(5)U4 tetrahedra,  an edgeedge with one O(2)U4 tetrahedra,  an edgeedge with one O(7)U4 tetrahedra,  an edgeedge with one O(9)U4 tetrahedra,  an edgeedge with one O(1)ZrU3 tetrahedra,  an edgeedge with one O(3)ZrU3 tetrahedra, and  an edgeedge with one O(8)ZrU3 tetrahedra. In the fifth O site, O(5) is bonded to one U(2), one U(3), and two equivalent U(5) atoms to form OU4 tetrahedra that share  a cornercorner with one O(10)U4 tetrahedra,  a cornercorner with one O(2)U4 tetrahedra,  a cornercorner with one O(7)U4 tetrahedra,  a cornercorner with one O(3)ZrU3 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(6)U4 tetrahedra, corners with three equivalent O(9)U4 tetrahedra, corners with three equivalent O(1)ZrU3 tetrahedra, corners with three equivalent O(4)ZrU3 tetrahedra,  an edgeedge with one O(10)U4 tetrahedra,  an edgeedge with one O(2)U4 tetrahedra,  an edgeedge with one O(5)U4 tetrahedra,  an edgeedge with one O(7)U4 tetrahedra,  an edgeedge with one O(9)U4 tetrahedra, and  an edgeedge with one O(8)ZrU3 tetrahedra. In the sixth O site, O(6) is bonded to one U(2), one U(3), and two equivalent U(4) atoms to form OU4 tetrahedra that share  a cornercorner with one O(7)U4 tetrahedra,  a cornercorner with one O(9)U4 tetrahedra,  a cornercorner with one O(1)ZrU3 tetrahedra,  a cornercorner with one O(4)ZrU3 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(5)U4 tetrahedra, corners with three equivalent O(10)U4 tetrahedra, corners with three equivalent O(2)U4 tetrahedra, corners with three equivalent O(3)ZrU3 tetrahedra,  an edgeedge with one O(10)U4 tetrahedra,  an edgeedge with one O(6)U4 tetrahedra,  an edgeedge with one O(7)U4 tetrahedra,  an edgeedge with one O(9)U4 tetrahedra,  an edgeedge with one O(1)ZrU3 tetrahedra, and  an edgeedge with one O(8)ZrU3 tetrahedra. In the seventh O site, O(7) is bonded to one U(1), one U(3), one U(4), and one U(5) atom to form OU4 tetrahedra that share  a cornercorner with one O(5)U4 tetrahedra,  a cornercorner with one O(6)U4 tetrahedra,  a cornercorner with one O(7)U4 tetrahedra,  a cornercorner with one O(9)U4 tetrahedra,  a cornercorner with one O(1)ZrU3 tetrahedra,  a cornercorner with one O(4)ZrU3 tetrahedra, corners with two equivalent O(2)U4 tetrahedra, corners with two equivalent O(3)ZrU3 tetrahedra, corners with two equivalent O(8)ZrU3 tetrahedra, corners with four equivalent O(10)U4 tetrahedra,  an edgeedge with one O(2)U4 tetrahedra,  an edgeedge with one O(5)U4 tetrahedra,  an edgeedge with one O(6)U4 tetrahedra,  an edgeedge with one O(9)U4 tetrahedra,  an edgeedge with one O(3)ZrU3 tetrahedra, and  an edgeedge with one O(4)ZrU3 tetrahedra. In the eighth O site, O(8) is bonded to one U(2), one U(4), one U(5), and one Zr(1) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(10)U4 tetrahedra,  a cornercorner with one O(2)U4 tetrahedra,  a cornercorner with one O(5)U4 tetrahedra,  a cornercorner with one O(6)U4 tetrahedra,  a cornercorner with one O(3)ZrU3 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(7)U4 tetrahedra, corners with two equivalent O(1)ZrU3 tetrahedra, corners with two equivalent O(4)ZrU3 tetrahedra, corners with four equivalent O(9)U4 tetrahedra,  an edgeedge with one O(10)U4 tetrahedra,  an edgeedge with one O(5)U4 tetrahedra,  an edgeedge with one O(6)U4 tetrahedra,  an edgeedge with one O(1)ZrU3 tetrahedra,  an edgeedge with one O(3)ZrU3 tetrahedra, and  an edgeedge with one O(4)ZrU3 tetrahedra. In the ninth O site, O(9) is bonded to one U(2), one U(4), and two equivalent U(5) atoms to form OU4 tetrahedra that share  a cornercorner with one O(2)U4 tetrahedra,  a cornercorner with one O(6)U4 tetrahedra,  a cornercorner with one O(7)U4 tetrahedra,  a cornercorner with one O(3)ZrU3 tetrahedra,  a cornercorner with one O(4)ZrU3 tetrahedra, corners with two equivalent O(10)U4 tetrahedra, corners with two equivalent O(1)ZrU3 tetrahedra, corners with three equivalent O(5)U4 tetrahedra, corners with four equivalent O(8)ZrU3 tetrahedra,  an edgeedge with one O(10)U4 tetrahedra,  an edgeedge with one O(5)U4 tetrahedra,  an edgeedge with one O(6)U4 tetrahedra,  an edgeedge with one O(7)U4 tetrahedra,  an edgeedge with one O(9)U4 tetrahedra, and  an edgeedge with one O(4)ZrU3 tetrahedra. In the tenth O site, O(10) is bonded to one U(3), one U(5), and two equivalent U(4) atoms to form OU4 tetrahedra that share  a cornercorner with one O(5)U4 tetrahedra,  a cornercorner with one O(1)ZrU3 tetrahedra,  a cornercorner with one O(3)ZrU3 tetrahedra,  a cornercorner with one O(4)ZrU3 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(2)U4 tetrahedra, corners with two equivalent O(9)U4 tetrahedra, corners with three equivalent O(6)U4 tetrahedra, corners with four equivalent O(7)U4 tetrahedra,  an edgeedge with one O(10)U4 tetrahedra,  an edgeedge with one O(5)U4 tetrahedra,  an edgeedge with one O(6)U4 tetrahedra,  an edgeedge with one O(9)U4 tetrahedra,  an edgeedge with one O(3)ZrU3 tetrahedra, and  an edgeedge with one O(8)ZrU3 tetrahedra. is represented by the CIF card [CIF]
data_ZrU9O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.606
_cell_length_b   7.631
_cell_length_c   8.529
_cell_angle_alpha   102.923
_cell_angle_beta   97.431
_cell_angle_gamma   106.781
_symmetry_Int_Tables_number   1
_cell_volume   392.478
_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
  Zr  Zr0  1  0.000  0.000  0.000  1.0
  U  U1  1  0.000  0.500  0.000  1.0
  U  U2  1  0.401  0.801  0.801  1.0
  U  U3  1  0.398  0.299  0.801  1.0
  U  U4  1  0.801  0.100  0.602  1.0
  U  U5  1  0.801  0.601  0.602  1.0
  U  U6  1  0.199  0.399  0.398  1.0
  U  U7  1  0.199  0.900  0.398  1.0
  U  U8  1  0.602  0.701  0.199  1.0
  U  U9  1  0.599  0.199  0.199  1.0
  O  O10  1  0.341  0.072  0.952  1.0
  O  O11  1  0.349  0.575  0.949  1.0
  O  O12  1  0.049  0.219  0.854  1.0
  O  O13  1  0.050  0.732  0.854  1.0
  O  O14  1  0.450  0.525  0.650  1.0
  O  O15  1  0.451  0.025  0.651  1.0
  O  O16  1  0.752  0.376  0.751  1.0
  O  O17  1  0.757  0.879  0.757  1.0
  O  O18  1  0.150  0.675  0.550  1.0
  O  O19  1  0.151  0.175  0.550  1.0
  O  O20  1  0.850  0.325  0.450  1.0
  O  O21  1  0.550  0.474  0.350  1.0
  O  O22  1  0.549  0.975  0.349  1.0
  O  O23  1  0.849  0.825  0.450  1.0
  O  O24  1  0.243  0.121  0.243  1.0
  O  O25  1  0.248  0.624  0.249  1.0
  O  O26  1  0.651  0.425  0.051  1.0
  O  O27  1  0.659  0.928  0.048  1.0
  O  O28  1  0.950  0.268  0.146  1.0
  O  O29  1  0.951  0.781  0.146  1.0
[/CIF]
.