The material structure described by U7Zr3O20 is Fluorite-derived structured and crystallizes in the monoclinic Cm space group. There are seven inequivalent U sites. In the first U site, U(1) is bonded in a body-centered cubic geometry to one O(1), one O(6), one O(7), one O(9), two equivalent O(13), and two equivalent O(5) atoms. In the second U site, U(2) is bonded in a body-centered cubic geometry to one O(12), one O(3), one O(7), one O(9), two equivalent O(11), and two equivalent O(4) atoms. In the third U site, U(3) is bonded in a body-centered cubic geometry to one O(10), one O(12), one O(14), one O(3), two equivalent O(17), and two equivalent O(8) atoms. In the fourth U site, U(4) is bonded in a body-centered cubic geometry to one O(11), one O(13), one O(17), one O(4), two equivalent O(3), and two equivalent O(9) atoms. In the fifth U site, U(5) is bonded in a body-centered cubic geometry to one O(16), one O(18), one O(19), one O(8), two equivalent O(10), and two equivalent O(15) atoms. In the sixth U site, U(6) is bonded in a body-centered cubic geometry to one O(10), one O(14), one O(15), one O(20), two equivalent O(16), and two equivalent O(19) atoms. In the seventh U site, U(7) is bonded in a body-centered cubic geometry to one O(1), one O(18), one O(19), one O(6), two equivalent O(2), and two equivalent O(20) atoms. There are three inequivalent Zr sites. In the first Zr site, Zr(1) is bonded in a body-centered cubic geometry to one O(13), one O(2), one O(4), one O(5), two equivalent O(1), and two equivalent O(7) atoms. In the second Zr site, Zr(2) is bonded in a body-centered cubic geometry to one O(11), one O(16), one O(17), one O(8), two equivalent O(12), and two equivalent O(14) atoms. In the third Zr site, Zr(3) is bonded in a body-centered cubic geometry to one O(15), one O(2), one O(20), one O(5), two equivalent O(18), and two equivalent O(6) atoms. There are twenty inequivalent O sites. In the first O site, O(1) is bonded to one U(1), one U(7), and two equivalent Zr(1) atoms to form OZr2U2 tetrahedra that share  a cornercorner with one O(19)U4 tetrahedra,  a cornercorner with one O(9)U4 tetrahedra,  a cornercorner with one O(18)Zr2U2 tetrahedra, corners with two equivalent O(1)Zr2U2 tetrahedra, corners with two equivalent O(20)ZrU3 tetrahedra, corners with two equivalent O(4)ZrU3 tetrahedra, corners with three equivalent O(7)Zr2U2 tetrahedra, corners with four equivalent O(5)Zr2U2 tetrahedra,  an edgeedge with one O(6)Zr2U2 tetrahedra,  an edgeedge with one O(7)Zr2U2 tetrahedra, edges with two equivalent O(2)Zr2U2 tetrahedra, and edges with two equivalent O(13)ZrU3 tetrahedra. In the second O site, O(2) is bonded to two equivalent U(7), one Zr(1), and one Zr(3) atom to form OZr2U2 tetrahedra that share  a cornercorner with one O(13)ZrU3 tetrahedra,  a cornercorner with one O(15)ZrU3 tetrahedra,  a cornercorner with one O(4)ZrU3 tetrahedra, corners with two equivalent O(19)U4 tetrahedra, corners with two equivalent O(2)Zr2U2 tetrahedra, corners with two equivalent O(7)Zr2U2 tetrahedra, corners with three equivalent O(20)ZrU3 tetrahedra, corners with four equivalent O(6)Zr2U2 tetrahedra,  an edgeedge with one O(5)Zr2U2 tetrahedra,  an edgeedge with one O(20)ZrU3 tetrahedra, edges with two equivalent O(1)Zr2U2 tetrahedra, and edges with two equivalent O(18)Zr2U2 tetrahedra. In the third O site, O(3) 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(10)U4 tetrahedra,  a cornercorner with one O(14)Zr2U2 tetrahedra,  a cornercorner with one O(7)Zr2U2 tetrahedra, corners with two equivalent O(3)U4 tetrahedra, corners with two equivalent O(13)ZrU3 tetrahedra, corners with two equivalent O(8)ZrU3 tetrahedra, corners with three equivalent O(9)U4 tetrahedra, corners with four equivalent O(11)ZrU3 tetrahedra,  an edgeedge with one O(9)U4 tetrahedra,  an edgeedge with one O(12)Zr2U2 tetrahedra, edges with two equivalent O(17)ZrU3 tetrahedra, and edges with two equivalent O(4)ZrU3 tetrahedra. In the fourth O site, O(4) is bonded to one U(4), two equivalent U(2), and one Zr(1) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(2)Zr2U2 tetrahedra,  a cornercorner with one O(5)Zr2U2 tetrahedra,  a cornercorner with one O(17)ZrU3 tetrahedra, corners with two equivalent O(1)Zr2U2 tetrahedra, corners with two equivalent O(12)Zr2U2 tetrahedra, corners with two equivalent O(4)ZrU3 tetrahedra, corners with three equivalent O(11)ZrU3 tetrahedra, corners with four equivalent O(9)U4 tetrahedra,  an edgeedge with one O(11)ZrU3 tetrahedra,  an edgeedge with one O(13)ZrU3 tetrahedra, edges with two equivalent O(3)U4 tetrahedra, and edges with two equivalent O(7)Zr2U2 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent U(1), one Zr(1), and one Zr(3) atom to form OZr2U2 tetrahedra that share  a cornercorner with one O(15)ZrU3 tetrahedra,  a cornercorner with one O(20)ZrU3 tetrahedra,  a cornercorner with one O(4)ZrU3 tetrahedra, corners with two equivalent O(9)U4 tetrahedra, corners with two equivalent O(18)Zr2U2 tetrahedra, corners with two equivalent O(5)Zr2U2 tetrahedra, corners with three equivalent O(13)ZrU3 tetrahedra, corners with four equivalent O(1)Zr2U2 tetrahedra,  an edgeedge with one O(2)Zr2U2 tetrahedra,  an edgeedge with one O(13)ZrU3 tetrahedra, edges with two equivalent O(6)Zr2U2 tetrahedra, and edges with two equivalent O(7)Zr2U2 tetrahedra. In the sixth O site, O(6) is bonded to one U(1), one U(7), and two equivalent Zr(3) atoms to form OZr2U2 tetrahedra that share  a cornercorner with one O(19)U4 tetrahedra,  a cornercorner with one O(9)U4 tetrahedra,  a cornercorner with one O(7)Zr2U2 tetrahedra, corners with two equivalent O(6)Zr2U2 tetrahedra, corners with two equivalent O(13)ZrU3 tetrahedra, corners with two equivalent O(15)ZrU3 tetrahedra, corners with three equivalent O(18)Zr2U2 tetrahedra, corners with four equivalent O(2)Zr2U2 tetrahedra,  an edgeedge with one O(1)Zr2U2 tetrahedra,  an edgeedge with one O(18)Zr2U2 tetrahedra, edges with two equivalent O(5)Zr2U2 tetrahedra, and edges with two equivalent O(20)ZrU3 tetrahedra. In the seventh O site, O(7) is bonded to one U(1), one U(2), and two equivalent Zr(1) atoms to form OZr2U2 tetrahedra that share  a cornercorner with one O(3)U4 tetrahedra,  a cornercorner with one O(12)Zr2U2 tetrahedra,  a cornercorner with one O(6)Zr2U2 tetrahedra, corners with two equivalent O(2)Zr2U2 tetrahedra, corners with two equivalent O(7)Zr2U2 tetrahedra, corners with two equivalent O(11)ZrU3 tetrahedra, corners with three equivalent O(1)Zr2U2 tetrahedra, corners with four equivalent O(13)ZrU3 tetrahedra,  an edgeedge with one O(9)U4 tetrahedra,  an edgeedge with one O(1)Zr2U2 tetrahedra, edges with two equivalent O(5)Zr2U2 tetrahedra, and edges with two equivalent O(4)ZrU3 tetrahedra. In the eighth O site, O(8) is bonded to one U(5), two equivalent U(3), and one Zr(2) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(19)U4 tetrahedra,  a cornercorner with one O(18)Zr2U2 tetrahedra,  a cornercorner with one O(11)ZrU3 tetrahedra, corners with two equivalent O(3)U4 tetrahedra, corners with two equivalent O(15)ZrU3 tetrahedra, corners with two equivalent O(8)ZrU3 tetrahedra, corners with three equivalent O(17)ZrU3 tetrahedra, corners with four equivalent O(14)Zr2U2 tetrahedra,  an edgeedge with one O(16)ZrU3 tetrahedra,  an edgeedge with one O(17)ZrU3 tetrahedra, edges with two equivalent O(10)U4 tetrahedra, and edges with two equivalent O(12)Zr2U2 tetrahedra. In the ninth O site, O(9) is bonded to one U(1), one U(2), and two equivalent U(4) atoms to form OU4 tetrahedra that share  a cornercorner with one O(1)Zr2U2 tetrahedra,  a cornercorner with one O(12)Zr2U2 tetrahedra,  a cornercorner with one O(6)Zr2U2 tetrahedra, corners with two equivalent O(9)U4 tetrahedra, corners with two equivalent O(5)Zr2U2 tetrahedra, corners with two equivalent O(17)ZrU3 tetrahedra, corners with three equivalent O(3)U4 tetrahedra, corners with four equivalent O(4)ZrU3 tetrahedra,  an edgeedge with one O(3)U4 tetrahedra,  an edgeedge with one O(7)Zr2U2 tetrahedra, edges with two equivalent O(11)ZrU3 tetrahedra, and edges with two equivalent O(13)ZrU3 tetrahedra. In the tenth O site, O(10) is bonded to one U(3), one U(6), and two equivalent U(5) atoms to form OU4 tetrahedra that share  a cornercorner with one O(3)U4 tetrahedra,  a cornercorner with one O(12)Zr2U2 tetrahedra,  a cornercorner with one O(20)ZrU3 tetrahedra, corners with two equivalent O(10)U4 tetrahedra, corners with two equivalent O(18)Zr2U2 tetrahedra, corners with two equivalent O(17)ZrU3 tetrahedra, corners with three equivalent O(15)ZrU3 tetrahedra, corners with four equivalent O(16)ZrU3 tetrahedra,  an edgeedge with one O(14)Zr2U2 tetrahedra,  an edgeedge with one O(15)ZrU3 tetrahedra, edges with two equivalent O(19)U4 tetrahedra, and edges with two equivalent O(8)ZrU3 tetrahedra. In the eleventh O site, O(11) is bonded to one U(4), two equivalent U(2), and one Zr(2) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(13)ZrU3 tetrahedra,  a cornercorner with one O(16)ZrU3 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(14)Zr2U2 tetrahedra, corners with two equivalent O(7)Zr2U2 tetrahedra, corners with two equivalent O(11)ZrU3 tetrahedra, corners with three equivalent O(4)ZrU3 tetrahedra, corners with four equivalent O(3)U4 tetrahedra,  an edgeedge with one O(17)ZrU3 tetrahedra,  an edgeedge with one O(4)ZrU3 tetrahedra, edges with two equivalent O(9)U4 tetrahedra, and edges with two equivalent O(12)Zr2U2 tetrahedra. In the twelfth O site, O(12) is bonded to one U(2), one U(3), and two equivalent Zr(2) atoms to form OZr2U2 tetrahedra that share  a cornercorner with one O(10)U4 tetrahedra,  a cornercorner with one O(9)U4 tetrahedra,  a cornercorner with one O(7)Zr2U2 tetrahedra, corners with two equivalent O(12)Zr2U2 tetrahedra, corners with two equivalent O(16)ZrU3 tetrahedra, corners with two equivalent O(4)ZrU3 tetrahedra, corners with three equivalent O(14)Zr2U2 tetrahedra, corners with four equivalent O(17)ZrU3 tetrahedra,  an edgeedge with one O(3)U4 tetrahedra,  an edgeedge with one O(14)Zr2U2 tetrahedra, edges with two equivalent O(11)ZrU3 tetrahedra, and edges with two equivalent O(8)ZrU3 tetrahedra. In the thirteenth O site, O(13) is bonded to one U(4), two equivalent U(1), and one Zr(1) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(2)Zr2U2 tetrahedra,  a cornercorner with one O(11)ZrU3 tetrahedra,  a cornercorner with one O(17)ZrU3 tetrahedra, corners with two equivalent O(3)U4 tetrahedra, corners with two equivalent O(6)Zr2U2 tetrahedra, corners with two equivalent O(13)ZrU3 tetrahedra, corners with three equivalent O(5)Zr2U2 tetrahedra, corners with four equivalent O(7)Zr2U2 tetrahedra,  an edgeedge with one O(5)Zr2U2 tetrahedra,  an edgeedge with one O(4)ZrU3 tetrahedra, edges with two equivalent O(9)U4 tetrahedra, and edges with two equivalent O(1)Zr2U2 tetrahedra. In the fourteenth O site, O(14) is bonded to one U(3), one U(6), and two equivalent Zr(2) atoms to form OZr2U2 tetrahedra that share  a cornercorner with one O(3)U4 tetrahedra,  a cornercorner with one O(15)ZrU3 tetrahedra,  a cornercorner with one O(20)ZrU3 tetrahedra, corners with two equivalent O(19)U4 tetrahedra, corners with two equivalent O(14)Zr2U2 tetrahedra, corners with two equivalent O(11)ZrU3 tetrahedra, corners with three equivalent O(12)Zr2U2 tetrahedra, corners with four equivalent O(8)ZrU3 tetrahedra,  an edgeedge with one O(10)U4 tetrahedra,  an edgeedge with one O(12)Zr2U2 tetrahedra, edges with two equivalent O(16)ZrU3 tetrahedra, and edges with two equivalent O(17)ZrU3 tetrahedra. In the fifteenth O site, O(15) is bonded to one U(6), two equivalent U(5), and one Zr(3) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(14)Zr2U2 tetrahedra,  a cornercorner with one O(2)Zr2U2 tetrahedra,  a cornercorner with one O(5)Zr2U2 tetrahedra, corners with two equivalent O(6)Zr2U2 tetrahedra, corners with two equivalent O(15)ZrU3 tetrahedra, corners with two equivalent O(8)ZrU3 tetrahedra, corners with three equivalent O(10)U4 tetrahedra, corners with four equivalent O(19)U4 tetrahedra,  an edgeedge with one O(10)U4 tetrahedra,  an edgeedge with one O(20)ZrU3 tetrahedra, edges with two equivalent O(18)Zr2U2 tetrahedra, and edges with two equivalent O(16)ZrU3 tetrahedra. In the sixteenth O site, O(16) is bonded to one U(5), two equivalent U(6), and one Zr(2) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(18)Zr2U2 tetrahedra,  a cornercorner with one O(11)ZrU3 tetrahedra,  a cornercorner with one O(17)ZrU3 tetrahedra, corners with two equivalent O(12)Zr2U2 tetrahedra, corners with two equivalent O(16)ZrU3 tetrahedra, corners with two equivalent O(20)ZrU3 tetrahedra, corners with three equivalent O(19)U4 tetrahedra, corners with four equivalent O(10)U4 tetrahedra,  an edgeedge with one O(19)U4 tetrahedra,  an edgeedge with one O(8)ZrU3 tetrahedra, edges with two equivalent O(14)Zr2U2 tetrahedra, and edges with two equivalent O(15)ZrU3 tetrahedra. In the seventeenth O site, O(17) is bonded to one U(4), two equivalent U(3), and one Zr(2) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(13)ZrU3 tetrahedra,  a cornercorner with one O(16)ZrU3 tetrahedra,  a cornercorner with one O(4)ZrU3 tetrahedra, corners with two equivalent O(10)U4 tetrahedra, corners with two equivalent O(9)U4 tetrahedra, corners with two equivalent O(17)ZrU3 tetrahedra, corners with three equivalent O(8)ZrU3 tetrahedra, corners with four equivalent O(12)Zr2U2 tetrahedra,  an edgeedge with one O(11)ZrU3 tetrahedra,  an edgeedge with one O(8)ZrU3 tetrahedra, edges with two equivalent O(3)U4 tetrahedra, and edges with two equivalent O(14)Zr2U2 tetrahedra. In the eighteenth O site, O(18) is bonded to one U(5), one U(7), and two equivalent Zr(3) atoms to form OZr2U2 tetrahedra that share  a cornercorner with one O(1)Zr2U2 tetrahedra,  a cornercorner with one O(16)ZrU3 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(10)U4 tetrahedra, corners with two equivalent O(18)Zr2U2 tetrahedra, corners with two equivalent O(5)Zr2U2 tetrahedra, corners with three equivalent O(6)Zr2U2 tetrahedra, corners with four equivalent O(20)ZrU3 tetrahedra,  an edgeedge with one O(19)U4 tetrahedra,  an edgeedge with one O(6)Zr2U2 tetrahedra, edges with two equivalent O(2)Zr2U2 tetrahedra, and edges with two equivalent O(15)ZrU3 tetrahedra. In the nineteenth O site, O(19) is bonded to one U(5), one U(7), and two equivalent U(6) atoms to form OU4 tetrahedra that share  a cornercorner with one O(1)Zr2U2 tetrahedra,  a cornercorner with one O(6)Zr2U2 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(19)U4 tetrahedra, corners with two equivalent O(14)Zr2U2 tetrahedra, corners with two equivalent O(2)Zr2U2 tetrahedra, corners with three equivalent O(16)ZrU3 tetrahedra, corners with four equivalent O(15)ZrU3 tetrahedra,  an edgeedge with one O(18)Zr2U2 tetrahedra,  an edgeedge with one O(16)ZrU3 tetrahedra, edges with two equivalent O(10)U4 tetrahedra, and edges with two equivalent O(20)ZrU3 tetrahedra. In the twentieth O site, O(20) is bonded to one U(6), two equivalent U(7), and one Zr(3) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(10)U4 tetrahedra,  a cornercorner with one O(14)Zr2U2 tetrahedra,  a cornercorner with one O(5)Zr2U2 tetrahedra, corners with two equivalent O(1)Zr2U2 tetrahedra, corners with two equivalent O(16)ZrU3 tetrahedra, corners with two equivalent O(20)ZrU3 tetrahedra, corners with three equivalent O(2)Zr2U2 tetrahedra, corners with four equivalent O(18)Zr2U2 tetrahedra,  an edgeedge with one O(2)Zr2U2 tetrahedra,  an edgeedge with one O(15)ZrU3 tetrahedra, edges with two equivalent O(19)U4 tetrahedra, and edges with two equivalent O(6)Zr2U2 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Zr3U7O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   15.570
_cell_length_b   15.570
_cell_length_c   6.539
_cell_angle_alpha   86.132
_cell_angle_beta   86.132
_cell_angle_gamma   13.969
_symmetry_Int_Tables_number   1
_cell_volume   381.765
_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  0.398  0.398  0.201  1.0
  Zr  Zr1  1  0.198  0.198  0.597  1.0
  Zr  Zr2  1  0.497  0.497  0.498  1.0
  U  U3  1  0.899  0.899  0.698  1.0
  U  U4  1  0.798  0.798  0.399  1.0
  U  U5  1  0.698  0.698  0.099  1.0
  U  U6  1  0.298  0.298  0.898  1.0
  U  U7  1  0.097  0.097  0.300  1.0
  U  U8  1  0.598  0.598  0.797  1.0
  U  U9  1  0.996  0.996  0.001  1.0
  O  O10  1  0.922  0.922  0.033  1.0
  O  O11  1  0.471  0.471  0.183  1.0
  O  O12  1  0.773  0.773  0.075  1.0
  O  O13  1  0.325  0.325  0.226  1.0
  O  O14  1  0.424  0.424  0.516  1.0
  O  O15  1  0.973  0.973  0.667  1.0
  O  O16  1  0.875  0.875  0.366  1.0
  O  O17  1  0.174  0.174  0.281  1.0
  O  O18  1  0.824  0.824  0.722  1.0
  O  O19  1  0.622  0.622  0.126  1.0
  O  O20  1  0.271  0.271  0.574  1.0
  O  O21  1  0.722  0.722  0.432  1.0
  O  O22  1  0.375  0.375  0.880  1.0
  O  O23  1  0.673  0.673  0.766  1.0
  O  O24  1  0.570  0.570  0.474  1.0
  O  O25  1  0.124  0.124  0.621  1.0
  O  O26  1  0.221  0.221  0.916  1.0
  O  O27  1  0.021  0.021  0.332  1.0
  O  O28  1  0.072  0.072  0.973  1.0
  O  O29  1  0.520  0.520  0.820  1.0
[/CIF]
.
The material structure described by U7Zr3O20 is Fluorite-derived structured and crystallizes in the monoclinic Cm space group. There are seven inequivalent U sites. In the first U site, U(1) is bonded in a body-centered cubic geometry to one O(1), one O(6), one O(7), one O(9), two equivalent O(13), and two equivalent O(5) atoms. In the second U site, U(2) is bonded in a body-centered cubic geometry to one O(12), one O(3), one O(7), one O(9), two equivalent O(11), and two equivalent O(4) atoms. In the third U site, U(3) is bonded in a body-centered cubic geometry to one O(10), one O(12), one O(14), one O(3), two equivalent O(17), and two equivalent O(8) atoms. In the fourth U site, U(4) is bonded in a body-centered cubic geometry to one O(11), one O(13), one O(17), one O(4), two equivalent O(3), and two equivalent O(9) atoms. In the fifth U site, U(5) is bonded in a body-centered cubic geometry to one O(16), one O(18), one O(19), one O(8), two equivalent O(10), and two equivalent O(15) atoms. In the sixth U site, U(6) is bonded in a body-centered cubic geometry to one O(10), one O(14), one O(15), one O(20), two equivalent O(16), and two equivalent O(19) atoms. In the seventh U site, U(7) is bonded in a body-centered cubic geometry to one O(1), one O(18), one O(19), one O(6), two equivalent O(2), and two equivalent O(20) atoms. There are three inequivalent Zr sites. In the first Zr site, Zr(1) is bonded in a body-centered cubic geometry to one O(13), one O(2), one O(4), one O(5), two equivalent O(1), and two equivalent O(7) atoms. In the second Zr site, Zr(2) is bonded in a body-centered cubic geometry to one O(11), one O(16), one O(17), one O(8), two equivalent O(12), and two equivalent O(14) atoms. In the third Zr site, Zr(3) is bonded in a body-centered cubic geometry to one O(15), one O(2), one O(20), one O(5), two equivalent O(18), and two equivalent O(6) atoms. There are twenty inequivalent O sites. In the first O site, O(1) is bonded to one U(1), one U(7), and two equivalent Zr(1) atoms to form OZr2U2 tetrahedra that share  a cornercorner with one O(19)U4 tetrahedra,  a cornercorner with one O(9)U4 tetrahedra,  a cornercorner with one O(18)Zr2U2 tetrahedra, corners with two equivalent O(1)Zr2U2 tetrahedra, corners with two equivalent O(20)ZrU3 tetrahedra, corners with two equivalent O(4)ZrU3 tetrahedra, corners with three equivalent O(7)Zr2U2 tetrahedra, corners with four equivalent O(5)Zr2U2 tetrahedra,  an edgeedge with one O(6)Zr2U2 tetrahedra,  an edgeedge with one O(7)Zr2U2 tetrahedra, edges with two equivalent O(2)Zr2U2 tetrahedra, and edges with two equivalent O(13)ZrU3 tetrahedra. In the second O site, O(2) is bonded to two equivalent U(7), one Zr(1), and one Zr(3) atom to form OZr2U2 tetrahedra that share  a cornercorner with one O(13)ZrU3 tetrahedra,  a cornercorner with one O(15)ZrU3 tetrahedra,  a cornercorner with one O(4)ZrU3 tetrahedra, corners with two equivalent O(19)U4 tetrahedra, corners with two equivalent O(2)Zr2U2 tetrahedra, corners with two equivalent O(7)Zr2U2 tetrahedra, corners with three equivalent O(20)ZrU3 tetrahedra, corners with four equivalent O(6)Zr2U2 tetrahedra,  an edgeedge with one O(5)Zr2U2 tetrahedra,  an edgeedge with one O(20)ZrU3 tetrahedra, edges with two equivalent O(1)Zr2U2 tetrahedra, and edges with two equivalent O(18)Zr2U2 tetrahedra. In the third O site, O(3) 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(10)U4 tetrahedra,  a cornercorner with one O(14)Zr2U2 tetrahedra,  a cornercorner with one O(7)Zr2U2 tetrahedra, corners with two equivalent O(3)U4 tetrahedra, corners with two equivalent O(13)ZrU3 tetrahedra, corners with two equivalent O(8)ZrU3 tetrahedra, corners with three equivalent O(9)U4 tetrahedra, corners with four equivalent O(11)ZrU3 tetrahedra,  an edgeedge with one O(9)U4 tetrahedra,  an edgeedge with one O(12)Zr2U2 tetrahedra, edges with two equivalent O(17)ZrU3 tetrahedra, and edges with two equivalent O(4)ZrU3 tetrahedra. In the fourth O site, O(4) is bonded to one U(4), two equivalent U(2), and one Zr(1) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(2)Zr2U2 tetrahedra,  a cornercorner with one O(5)Zr2U2 tetrahedra,  a cornercorner with one O(17)ZrU3 tetrahedra, corners with two equivalent O(1)Zr2U2 tetrahedra, corners with two equivalent O(12)Zr2U2 tetrahedra, corners with two equivalent O(4)ZrU3 tetrahedra, corners with three equivalent O(11)ZrU3 tetrahedra, corners with four equivalent O(9)U4 tetrahedra,  an edgeedge with one O(11)ZrU3 tetrahedra,  an edgeedge with one O(13)ZrU3 tetrahedra, edges with two equivalent O(3)U4 tetrahedra, and edges with two equivalent O(7)Zr2U2 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent U(1), one Zr(1), and one Zr(3) atom to form OZr2U2 tetrahedra that share  a cornercorner with one O(15)ZrU3 tetrahedra,  a cornercorner with one O(20)ZrU3 tetrahedra,  a cornercorner with one O(4)ZrU3 tetrahedra, corners with two equivalent O(9)U4 tetrahedra, corners with two equivalent O(18)Zr2U2 tetrahedra, corners with two equivalent O(5)Zr2U2 tetrahedra, corners with three equivalent O(13)ZrU3 tetrahedra, corners with four equivalent O(1)Zr2U2 tetrahedra,  an edgeedge with one O(2)Zr2U2 tetrahedra,  an edgeedge with one O(13)ZrU3 tetrahedra, edges with two equivalent O(6)Zr2U2 tetrahedra, and edges with two equivalent O(7)Zr2U2 tetrahedra. In the sixth O site, O(6) is bonded to one U(1), one U(7), and two equivalent Zr(3) atoms to form OZr2U2 tetrahedra that share  a cornercorner with one O(19)U4 tetrahedra,  a cornercorner with one O(9)U4 tetrahedra,  a cornercorner with one O(7)Zr2U2 tetrahedra, corners with two equivalent O(6)Zr2U2 tetrahedra, corners with two equivalent O(13)ZrU3 tetrahedra, corners with two equivalent O(15)ZrU3 tetrahedra, corners with three equivalent O(18)Zr2U2 tetrahedra, corners with four equivalent O(2)Zr2U2 tetrahedra,  an edgeedge with one O(1)Zr2U2 tetrahedra,  an edgeedge with one O(18)Zr2U2 tetrahedra, edges with two equivalent O(5)Zr2U2 tetrahedra, and edges with two equivalent O(20)ZrU3 tetrahedra. In the seventh O site, O(7) is bonded to one U(1), one U(2), and two equivalent Zr(1) atoms to form OZr2U2 tetrahedra that share  a cornercorner with one O(3)U4 tetrahedra,  a cornercorner with one O(12)Zr2U2 tetrahedra,  a cornercorner with one O(6)Zr2U2 tetrahedra, corners with two equivalent O(2)Zr2U2 tetrahedra, corners with two equivalent O(7)Zr2U2 tetrahedra, corners with two equivalent O(11)ZrU3 tetrahedra, corners with three equivalent O(1)Zr2U2 tetrahedra, corners with four equivalent O(13)ZrU3 tetrahedra,  an edgeedge with one O(9)U4 tetrahedra,  an edgeedge with one O(1)Zr2U2 tetrahedra, edges with two equivalent O(5)Zr2U2 tetrahedra, and edges with two equivalent O(4)ZrU3 tetrahedra. In the eighth O site, O(8) is bonded to one U(5), two equivalent U(3), and one Zr(2) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(19)U4 tetrahedra,  a cornercorner with one O(18)Zr2U2 tetrahedra,  a cornercorner with one O(11)ZrU3 tetrahedra, corners with two equivalent O(3)U4 tetrahedra, corners with two equivalent O(15)ZrU3 tetrahedra, corners with two equivalent O(8)ZrU3 tetrahedra, corners with three equivalent O(17)ZrU3 tetrahedra, corners with four equivalent O(14)Zr2U2 tetrahedra,  an edgeedge with one O(16)ZrU3 tetrahedra,  an edgeedge with one O(17)ZrU3 tetrahedra, edges with two equivalent O(10)U4 tetrahedra, and edges with two equivalent O(12)Zr2U2 tetrahedra. In the ninth O site, O(9) is bonded to one U(1), one U(2), and two equivalent U(4) atoms to form OU4 tetrahedra that share  a cornercorner with one O(1)Zr2U2 tetrahedra,  a cornercorner with one O(12)Zr2U2 tetrahedra,  a cornercorner with one O(6)Zr2U2 tetrahedra, corners with two equivalent O(9)U4 tetrahedra, corners with two equivalent O(5)Zr2U2 tetrahedra, corners with two equivalent O(17)ZrU3 tetrahedra, corners with three equivalent O(3)U4 tetrahedra, corners with four equivalent O(4)ZrU3 tetrahedra,  an edgeedge with one O(3)U4 tetrahedra,  an edgeedge with one O(7)Zr2U2 tetrahedra, edges with two equivalent O(11)ZrU3 tetrahedra, and edges with two equivalent O(13)ZrU3 tetrahedra. In the tenth O site, O(10) is bonded to one U(3), one U(6), and two equivalent U(5) atoms to form OU4 tetrahedra that share  a cornercorner with one O(3)U4 tetrahedra,  a cornercorner with one O(12)Zr2U2 tetrahedra,  a cornercorner with one O(20)ZrU3 tetrahedra, corners with two equivalent O(10)U4 tetrahedra, corners with two equivalent O(18)Zr2U2 tetrahedra, corners with two equivalent O(17)ZrU3 tetrahedra, corners with three equivalent O(15)ZrU3 tetrahedra, corners with four equivalent O(16)ZrU3 tetrahedra,  an edgeedge with one O(14)Zr2U2 tetrahedra,  an edgeedge with one O(15)ZrU3 tetrahedra, edges with two equivalent O(19)U4 tetrahedra, and edges with two equivalent O(8)ZrU3 tetrahedra. In the eleventh O site, O(11) is bonded to one U(4), two equivalent U(2), and one Zr(2) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(13)ZrU3 tetrahedra,  a cornercorner with one O(16)ZrU3 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(14)Zr2U2 tetrahedra, corners with two equivalent O(7)Zr2U2 tetrahedra, corners with two equivalent O(11)ZrU3 tetrahedra, corners with three equivalent O(4)ZrU3 tetrahedra, corners with four equivalent O(3)U4 tetrahedra,  an edgeedge with one O(17)ZrU3 tetrahedra,  an edgeedge with one O(4)ZrU3 tetrahedra, edges with two equivalent O(9)U4 tetrahedra, and edges with two equivalent O(12)Zr2U2 tetrahedra. In the twelfth O site, O(12) is bonded to one U(2), one U(3), and two equivalent Zr(2) atoms to form OZr2U2 tetrahedra that share  a cornercorner with one O(10)U4 tetrahedra,  a cornercorner with one O(9)U4 tetrahedra,  a cornercorner with one O(7)Zr2U2 tetrahedra, corners with two equivalent O(12)Zr2U2 tetrahedra, corners with two equivalent O(16)ZrU3 tetrahedra, corners with two equivalent O(4)ZrU3 tetrahedra, corners with three equivalent O(14)Zr2U2 tetrahedra, corners with four equivalent O(17)ZrU3 tetrahedra,  an edgeedge with one O(3)U4 tetrahedra,  an edgeedge with one O(14)Zr2U2 tetrahedra, edges with two equivalent O(11)ZrU3 tetrahedra, and edges with two equivalent O(8)ZrU3 tetrahedra. In the thirteenth O site, O(13) is bonded to one U(4), two equivalent U(1), and one Zr(1) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(2)Zr2U2 tetrahedra,  a cornercorner with one O(11)ZrU3 tetrahedra,  a cornercorner with one O(17)ZrU3 tetrahedra, corners with two equivalent O(3)U4 tetrahedra, corners with two equivalent O(6)Zr2U2 tetrahedra, corners with two equivalent O(13)ZrU3 tetrahedra, corners with three equivalent O(5)Zr2U2 tetrahedra, corners with four equivalent O(7)Zr2U2 tetrahedra,  an edgeedge with one O(5)Zr2U2 tetrahedra,  an edgeedge with one O(4)ZrU3 tetrahedra, edges with two equivalent O(9)U4 tetrahedra, and edges with two equivalent O(1)Zr2U2 tetrahedra. In the fourteenth O site, O(14) is bonded to one U(3), one U(6), and two equivalent Zr(2) atoms to form OZr2U2 tetrahedra that share  a cornercorner with one O(3)U4 tetrahedra,  a cornercorner with one O(15)ZrU3 tetrahedra,  a cornercorner with one O(20)ZrU3 tetrahedra, corners with two equivalent O(19)U4 tetrahedra, corners with two equivalent O(14)Zr2U2 tetrahedra, corners with two equivalent O(11)ZrU3 tetrahedra, corners with three equivalent O(12)Zr2U2 tetrahedra, corners with four equivalent O(8)ZrU3 tetrahedra,  an edgeedge with one O(10)U4 tetrahedra,  an edgeedge with one O(12)Zr2U2 tetrahedra, edges with two equivalent O(16)ZrU3 tetrahedra, and edges with two equivalent O(17)ZrU3 tetrahedra. In the fifteenth O site, O(15) is bonded to one U(6), two equivalent U(5), and one Zr(3) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(14)Zr2U2 tetrahedra,  a cornercorner with one O(2)Zr2U2 tetrahedra,  a cornercorner with one O(5)Zr2U2 tetrahedra, corners with two equivalent O(6)Zr2U2 tetrahedra, corners with two equivalent O(15)ZrU3 tetrahedra, corners with two equivalent O(8)ZrU3 tetrahedra, corners with three equivalent O(10)U4 tetrahedra, corners with four equivalent O(19)U4 tetrahedra,  an edgeedge with one O(10)U4 tetrahedra,  an edgeedge with one O(20)ZrU3 tetrahedra, edges with two equivalent O(18)Zr2U2 tetrahedra, and edges with two equivalent O(16)ZrU3 tetrahedra. In the sixteenth O site, O(16) is bonded to one U(5), two equivalent U(6), and one Zr(2) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(18)Zr2U2 tetrahedra,  a cornercorner with one O(11)ZrU3 tetrahedra,  a cornercorner with one O(17)ZrU3 tetrahedra, corners with two equivalent O(12)Zr2U2 tetrahedra, corners with two equivalent O(16)ZrU3 tetrahedra, corners with two equivalent O(20)ZrU3 tetrahedra, corners with three equivalent O(19)U4 tetrahedra, corners with four equivalent O(10)U4 tetrahedra,  an edgeedge with one O(19)U4 tetrahedra,  an edgeedge with one O(8)ZrU3 tetrahedra, edges with two equivalent O(14)Zr2U2 tetrahedra, and edges with two equivalent O(15)ZrU3 tetrahedra. In the seventeenth O site, O(17) is bonded to one U(4), two equivalent U(3), and one Zr(2) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(13)ZrU3 tetrahedra,  a cornercorner with one O(16)ZrU3 tetrahedra,  a cornercorner with one O(4)ZrU3 tetrahedra, corners with two equivalent O(10)U4 tetrahedra, corners with two equivalent O(9)U4 tetrahedra, corners with two equivalent O(17)ZrU3 tetrahedra, corners with three equivalent O(8)ZrU3 tetrahedra, corners with four equivalent O(12)Zr2U2 tetrahedra,  an edgeedge with one O(11)ZrU3 tetrahedra,  an edgeedge with one O(8)ZrU3 tetrahedra, edges with two equivalent O(3)U4 tetrahedra, and edges with two equivalent O(14)Zr2U2 tetrahedra. In the eighteenth O site, O(18) is bonded to one U(5), one U(7), and two equivalent Zr(3) atoms to form OZr2U2 tetrahedra that share  a cornercorner with one O(1)Zr2U2 tetrahedra,  a cornercorner with one O(16)ZrU3 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(10)U4 tetrahedra, corners with two equivalent O(18)Zr2U2 tetrahedra, corners with two equivalent O(5)Zr2U2 tetrahedra, corners with three equivalent O(6)Zr2U2 tetrahedra, corners with four equivalent O(20)ZrU3 tetrahedra,  an edgeedge with one O(19)U4 tetrahedra,  an edgeedge with one O(6)Zr2U2 tetrahedra, edges with two equivalent O(2)Zr2U2 tetrahedra, and edges with two equivalent O(15)ZrU3 tetrahedra. In the nineteenth O site, O(19) is bonded to one U(5), one U(7), and two equivalent U(6) atoms to form OU4 tetrahedra that share  a cornercorner with one O(1)Zr2U2 tetrahedra,  a cornercorner with one O(6)Zr2U2 tetrahedra,  a cornercorner with one O(8)ZrU3 tetrahedra, corners with two equivalent O(19)U4 tetrahedra, corners with two equivalent O(14)Zr2U2 tetrahedra, corners with two equivalent O(2)Zr2U2 tetrahedra, corners with three equivalent O(16)ZrU3 tetrahedra, corners with four equivalent O(15)ZrU3 tetrahedra,  an edgeedge with one O(18)Zr2U2 tetrahedra,  an edgeedge with one O(16)ZrU3 tetrahedra, edges with two equivalent O(10)U4 tetrahedra, and edges with two equivalent O(20)ZrU3 tetrahedra. In the twentieth O site, O(20) is bonded to one U(6), two equivalent U(7), and one Zr(3) atom to form OZrU3 tetrahedra that share  a cornercorner with one O(10)U4 tetrahedra,  a cornercorner with one O(14)Zr2U2 tetrahedra,  a cornercorner with one O(5)Zr2U2 tetrahedra, corners with two equivalent O(1)Zr2U2 tetrahedra, corners with two equivalent O(16)ZrU3 tetrahedra, corners with two equivalent O(20)ZrU3 tetrahedra, corners with three equivalent O(2)Zr2U2 tetrahedra, corners with four equivalent O(18)Zr2U2 tetrahedra,  an edgeedge with one O(2)Zr2U2 tetrahedra,  an edgeedge with one O(15)ZrU3 tetrahedra, edges with two equivalent O(19)U4 tetrahedra, and edges with two equivalent O(6)Zr2U2 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Zr3U7O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   15.570
_cell_length_b   15.570
_cell_length_c   6.539
_cell_angle_alpha   86.132
_cell_angle_beta   86.132
_cell_angle_gamma   13.969
_symmetry_Int_Tables_number   1
_cell_volume   381.765
_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  0.398  0.398  0.201  1.0
  Zr  Zr1  1  0.198  0.198  0.597  1.0
  Zr  Zr2  1  0.497  0.497  0.498  1.0
  U  U3  1  0.899  0.899  0.698  1.0
  U  U4  1  0.798  0.798  0.399  1.0
  U  U5  1  0.698  0.698  0.099  1.0
  U  U6  1  0.298  0.298  0.898  1.0
  U  U7  1  0.097  0.097  0.300  1.0
  U  U8  1  0.598  0.598  0.797  1.0
  U  U9  1  0.996  0.996  0.001  1.0
  O  O10  1  0.922  0.922  0.033  1.0
  O  O11  1  0.471  0.471  0.183  1.0
  O  O12  1  0.773  0.773  0.075  1.0
  O  O13  1  0.325  0.325  0.226  1.0
  O  O14  1  0.424  0.424  0.516  1.0
  O  O15  1  0.973  0.973  0.667  1.0
  O  O16  1  0.875  0.875  0.366  1.0
  O  O17  1  0.174  0.174  0.281  1.0
  O  O18  1  0.824  0.824  0.722  1.0
  O  O19  1  0.622  0.622  0.126  1.0
  O  O20  1  0.271  0.271  0.574  1.0
  O  O21  1  0.722  0.722  0.432  1.0
  O  O22  1  0.375  0.375  0.880  1.0
  O  O23  1  0.673  0.673  0.766  1.0
  O  O24  1  0.570  0.570  0.474  1.0
  O  O25  1  0.124  0.124  0.621  1.0
  O  O26  1  0.221  0.221  0.916  1.0
  O  O27  1  0.021  0.021  0.332  1.0
  O  O28  1  0.072  0.072  0.973  1.0
  O  O29  1  0.520  0.520  0.820  1.0
[/CIF]
.