The structure described by U17O31 crystallizes in the monoclinic Cm space group. There are seventeen inequivalent U sites. In the first U site, U(1) is bonded in a body-centered cubic geometry to one O(2), one O(28), one O(31), one O(5), two equivalent O(30), and two equivalent O(4) atoms. In the second U site, U(2) is bonded in a 7-coordinate geometry to one O(3), one O(30), one O(7), two equivalent O(1), and two equivalent O(5) atoms. In the third U site, U(3) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(5), two equivalent O(3), and two equivalent O(8) atoms. In the fourth U site, U(4) is bonded in a body-centered cubic geometry to one O(1), one O(4), one O(6), one O(8), two equivalent O(2), and two equivalent O(7) atoms. In the fifth U site, U(5) is bonded in a body-centered cubic geometry to one O(12), one O(3), one O(7), one O(9), two equivalent O(10), and two equivalent O(6) atoms. In the sixth U site, U(6) is bonded to one O(10), one O(13), one O(17), two equivalent O(14), and two equivalent O(9) atoms to form distorted edge-sharing UO7 hexagonal pyramids. In the seventh U site, U(7) is bonded in a 6-coordinate geometry to one O(11), one O(14), one O(6), one O(8), and two equivalent O(12) atoms. In the eighth U site, U(8) is bonded in a body-centered cubic geometry to one O(12), one O(15), one O(18), one O(9), two equivalent O(11), and two equivalent O(17) atoms. In the ninth U site, U(9) is bonded in a body-centered cubic geometry to one O(11), one O(14), one O(16), one O(20), two equivalent O(13), and two equivalent O(18) atoms. In the tenth U site, U(10) is bonded to one O(13), one O(17), one O(22), two equivalent O(15), and two equivalent O(20) atoms to form a mixture of distorted edge and corner-sharing UO7 hexagonal pyramids. In the eleventh U site, U(11) is bonded in a body-centered cubic geometry to one O(15), one O(18), one O(19), one O(24), two equivalent O(16), and two equivalent O(22) atoms. In the twelfth U site, U(12) is bonded to one O(22), one O(23), one O(27), two equivalent O(19), and two equivalent O(26) atoms to form a mixture of distorted edge and corner-sharing UO7 hexagonal pyramids. In the thirteenth U site, U(13) is bonded in a 6-coordinate geometry to one O(16), one O(20), one O(21), one O(26), and two equivalent O(24) atoms. In the fourteenth U site, U(14) is bonded in a body-centered cubic geometry to one O(19), one O(24), one O(25), one O(29), two equivalent O(21), and two equivalent O(27) atoms. In the fifteenth U site, U(15) is bonded in a body-centered cubic geometry to one O(21), one O(26), one O(28), one O(31), two equivalent O(23), and two equivalent O(29) atoms. In the sixteenth U site, U(16) is bonded in a 7-coordinate geometry to one O(23), one O(27), one O(30), two equivalent O(25), and two equivalent O(31) atoms. In the seventeenth U site, U(17) is bonded in a 6-coordinate geometry to one O(1), one O(25), one O(29), one O(4), and two equivalent O(28) atoms. There are thirty-one inequivalent O sites. In the first O site, O(1) is bonded to one U(17), one U(4), and two equivalent U(2) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the second O site, O(2) is bonded to one U(1), one U(3), and two equivalent U(4) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the third O site, O(3) is bonded to one U(2), one U(5), and two equivalent U(3) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the fourth O site, O(4) is bonded to one U(17), one U(4), and two equivalent U(1) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the fifth O site, O(5) is bonded to one U(1), one U(3), and two equivalent U(2) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the sixth O site, O(6) is bonded to one U(4), one U(7), and two equivalent U(5) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the seventh O site, O(7) is bonded to one U(2), one U(5), and two equivalent U(4) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the eighth O site, O(8) is bonded to one U(4), one U(7), and two equivalent U(3) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the ninth O site, O(9) is bonded to one U(5), one U(8), and two equivalent U(6) atoms to form a mixture of edge and corner-sharing OU4 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 a mixture of edge and corner-sharing OU4 tetrahedra. In the eleventh O site, O(11) is bonded to one U(7), one U(9), and two equivalent U(8) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twelfth O site, O(12) is bonded to one U(5), one U(8), and two equivalent U(7) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the thirteenth O site, O(13) is bonded to one U(10), one U(6), and two equivalent U(9) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the fourteenth O site, O(14) is bonded to one U(7), one U(9), and two equivalent U(6) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the fifteenth O site, O(15) is bonded to one U(11), one U(8), and two equivalent U(10) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the sixteenth O site, O(16) is bonded to one U(13), one U(9), and two equivalent U(11) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the seventeenth O site, O(17) is bonded to one U(10), one U(6), and two equivalent U(8) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the eighteenth O site, O(18) is bonded to one U(11), one U(8), and two equivalent U(9) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the nineteenth O site, O(19) is bonded to one U(11), one U(14), and two equivalent U(12) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twentieth O site, O(20) is bonded to one U(13), one U(9), and two equivalent U(10) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-first O site, O(21) is bonded to one U(13), one U(15), and two equivalent U(14) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-second O site, O(22) is bonded to one U(10), one U(12), and two equivalent U(11) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-third O site, O(23) is bonded to one U(12), one U(16), and two equivalent U(15) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-fourth O site, O(24) is bonded to one U(11), one U(14), and two equivalent U(13) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-fifth O site, O(25) is bonded to one U(14), one U(17), and two equivalent U(16) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-sixth O site, O(26) is bonded to one U(13), one U(15), and two equivalent U(12) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-seventh O site, O(27) is bonded to one U(12), one U(16), and two equivalent U(14) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-eighth O site, O(28) is bonded to one U(1), one U(15), and two equivalent U(17) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-ninth O site, O(29) is bonded to one U(14), one U(17), and two equivalent U(15) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the thirtieth O site, O(30) is bonded to one U(16), one U(2), and two equivalent U(1) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the thirty-first O site, O(31) is bonded to one U(1), one U(15), and two equivalent U(16) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. is represented by the CIF file [CIF]
data_U17O31
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.618
_cell_length_b   8.618
_cell_length_c   22.093
_cell_angle_alpha   74.161
_cell_angle_beta   74.161
_cell_angle_gamma   25.745
_symmetry_Int_Tables_number   1
_cell_volume   684.167
_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
  U  U0  1  0.002  0.002  1.000  1.0
  U  U1  1  0.706  0.706  0.939  1.0
  U  U2  1  0.118  0.118  0.826  1.0
  U  U3  1  0.411  0.411  0.882  1.0
  U  U4  1  0.821  0.821  0.765  1.0
  U  U5  1  0.240  0.240  0.645  1.0
  U  U6  1  0.525  0.525  0.705  1.0
  U  U7  1  0.943  0.943  0.587  1.0
  U  U8  1  0.647  0.647  0.529  1.0
  U  U9  1  0.353  0.353  0.474  1.0
  U  U10  1  0.057  0.057  0.412  1.0
  U  U11  1  0.476  0.476  0.292  1.0
  U  U12  1  0.759  0.759  0.352  1.0
  U  U13  1  0.178  0.178  0.233  1.0
  U  U14  1  0.881  0.881  0.179  1.0
  U  U15  1  0.583  0.583  0.120  1.0
  U  U16  1  0.300  0.300  0.060  1.0
  O  O17  1  0.274  0.274  0.964  1.0
  O  O18  1  0.986  0.986  0.895  1.0
  O  O19  1  0.691  0.691  0.839  1.0
  O  O20  1  0.430  0.430  0.985  1.0
  O  O21  1  0.132  0.132  0.926  1.0
  O  O22  1  0.394  0.394  0.779  1.0
  O  O23  1  0.837  0.837  0.869  1.0
  O  O24  1  0.550  0.550  0.799  1.0
  O  O25  1  0.812  0.812  0.661  1.0
  O  O26  1  0.243  0.243  0.749  1.0
  O  O27  1  0.515  0.515  0.602  1.0
  O  O28  1  0.963  0.963  0.693  1.0
  O  O29  1  0.221  0.221  0.544  1.0
  O  O30  1  0.656  0.656  0.643  1.0
  O  O31  1  0.927  0.927  0.486  1.0
  O  O32  1  0.629  0.629  0.426  1.0
  O  O33  1  0.368  0.368  0.573  1.0
  O  O34  1  0.074  0.074  0.514  1.0
  O  O35  1  0.048  0.048  0.308  1.0
  O  O36  1  0.786  0.786  0.448  1.0
  O  O37  1  0.749  0.749  0.249  1.0
  O  O38  1  0.478  0.478  0.396  1.0
  O  O39  1  0.455  0.455  0.193  1.0
  O  O40  1  0.196  0.196  0.339  1.0
  O  O41  1  0.166  0.166  0.123  1.0
  O  O42  1  0.893  0.893  0.288  1.0
  O  O43  1  0.604  0.604  0.218  1.0
  O  O44  1  0.863  0.863  0.073  1.0
  O  O45  1  0.310  0.310  0.162  1.0
  O  O46  1  0.581  0.581  0.016  1.0
  O  O47  1  0.011  0.011  0.104  1.0
[/CIF]
.
The structure described by U17O31 crystallizes in the monoclinic Cm space group. There are seventeen inequivalent U sites. In the first U site, U(1) is bonded in a body-centered cubic geometry to one O(2), one O(28), one O(31), one O(5), two equivalent O(30), and two equivalent O(4) atoms. In the second U site, U(2) is bonded in a 7-coordinate geometry to one O(3), one O(30), one O(7), two equivalent O(1), and two equivalent O(5) atoms. In the third U site, U(3) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(5), two equivalent O(3), and two equivalent O(8) atoms. In the fourth U site, U(4) is bonded in a body-centered cubic geometry to one O(1), one O(4), one O(6), one O(8), two equivalent O(2), and two equivalent O(7) atoms. In the fifth U site, U(5) is bonded in a body-centered cubic geometry to one O(12), one O(3), one O(7), one O(9), two equivalent O(10), and two equivalent O(6) atoms. In the sixth U site, U(6) is bonded to one O(10), one O(13), one O(17), two equivalent O(14), and two equivalent O(9) atoms to form distorted edge-sharing UO7 hexagonal pyramids. In the seventh U site, U(7) is bonded in a 6-coordinate geometry to one O(11), one O(14), one O(6), one O(8), and two equivalent O(12) atoms. In the eighth U site, U(8) is bonded in a body-centered cubic geometry to one O(12), one O(15), one O(18), one O(9), two equivalent O(11), and two equivalent O(17) atoms. In the ninth U site, U(9) is bonded in a body-centered cubic geometry to one O(11), one O(14), one O(16), one O(20), two equivalent O(13), and two equivalent O(18) atoms. In the tenth U site, U(10) is bonded to one O(13), one O(17), one O(22), two equivalent O(15), and two equivalent O(20) atoms to form a mixture of distorted edge and corner-sharing UO7 hexagonal pyramids. In the eleventh U site, U(11) is bonded in a body-centered cubic geometry to one O(15), one O(18), one O(19), one O(24), two equivalent O(16), and two equivalent O(22) atoms. In the twelfth U site, U(12) is bonded to one O(22), one O(23), one O(27), two equivalent O(19), and two equivalent O(26) atoms to form a mixture of distorted edge and corner-sharing UO7 hexagonal pyramids. In the thirteenth U site, U(13) is bonded in a 6-coordinate geometry to one O(16), one O(20), one O(21), one O(26), and two equivalent O(24) atoms. In the fourteenth U site, U(14) is bonded in a body-centered cubic geometry to one O(19), one O(24), one O(25), one O(29), two equivalent O(21), and two equivalent O(27) atoms. In the fifteenth U site, U(15) is bonded in a body-centered cubic geometry to one O(21), one O(26), one O(28), one O(31), two equivalent O(23), and two equivalent O(29) atoms. In the sixteenth U site, U(16) is bonded in a 7-coordinate geometry to one O(23), one O(27), one O(30), two equivalent O(25), and two equivalent O(31) atoms. In the seventeenth U site, U(17) is bonded in a 6-coordinate geometry to one O(1), one O(25), one O(29), one O(4), and two equivalent O(28) atoms. There are thirty-one inequivalent O sites. In the first O site, O(1) is bonded to one U(17), one U(4), and two equivalent U(2) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the second O site, O(2) is bonded to one U(1), one U(3), and two equivalent U(4) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the third O site, O(3) is bonded to one U(2), one U(5), and two equivalent U(3) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the fourth O site, O(4) is bonded to one U(17), one U(4), and two equivalent U(1) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the fifth O site, O(5) is bonded to one U(1), one U(3), and two equivalent U(2) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the sixth O site, O(6) is bonded to one U(4), one U(7), and two equivalent U(5) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the seventh O site, O(7) is bonded to one U(2), one U(5), and two equivalent U(4) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the eighth O site, O(8) is bonded to one U(4), one U(7), and two equivalent U(3) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the ninth O site, O(9) is bonded to one U(5), one U(8), and two equivalent U(6) atoms to form a mixture of edge and corner-sharing OU4 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 a mixture of edge and corner-sharing OU4 tetrahedra. In the eleventh O site, O(11) is bonded to one U(7), one U(9), and two equivalent U(8) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twelfth O site, O(12) is bonded to one U(5), one U(8), and two equivalent U(7) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the thirteenth O site, O(13) is bonded to one U(10), one U(6), and two equivalent U(9) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the fourteenth O site, O(14) is bonded to one U(7), one U(9), and two equivalent U(6) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the fifteenth O site, O(15) is bonded to one U(11), one U(8), and two equivalent U(10) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the sixteenth O site, O(16) is bonded to one U(13), one U(9), and two equivalent U(11) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the seventeenth O site, O(17) is bonded to one U(10), one U(6), and two equivalent U(8) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the eighteenth O site, O(18) is bonded to one U(11), one U(8), and two equivalent U(9) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the nineteenth O site, O(19) is bonded to one U(11), one U(14), and two equivalent U(12) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twentieth O site, O(20) is bonded to one U(13), one U(9), and two equivalent U(10) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-first O site, O(21) is bonded to one U(13), one U(15), and two equivalent U(14) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-second O site, O(22) is bonded to one U(10), one U(12), and two equivalent U(11) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-third O site, O(23) is bonded to one U(12), one U(16), and two equivalent U(15) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-fourth O site, O(24) is bonded to one U(11), one U(14), and two equivalent U(13) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-fifth O site, O(25) is bonded to one U(14), one U(17), and two equivalent U(16) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-sixth O site, O(26) is bonded to one U(13), one U(15), and two equivalent U(12) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-seventh O site, O(27) is bonded to one U(12), one U(16), and two equivalent U(14) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-eighth O site, O(28) is bonded to one U(1), one U(15), and two equivalent U(17) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the twenty-ninth O site, O(29) is bonded to one U(14), one U(17), and two equivalent U(15) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the thirtieth O site, O(30) is bonded to one U(16), one U(2), and two equivalent U(1) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the thirty-first O site, O(31) is bonded to one U(1), one U(15), and two equivalent U(16) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. is represented by the CIF file [CIF]
data_U17O31
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.618
_cell_length_b   8.618
_cell_length_c   22.093
_cell_angle_alpha   74.161
_cell_angle_beta   74.161
_cell_angle_gamma   25.745
_symmetry_Int_Tables_number   1
_cell_volume   684.167
_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
  U  U0  1  0.002  0.002  1.000  1.0
  U  U1  1  0.706  0.706  0.939  1.0
  U  U2  1  0.118  0.118  0.826  1.0
  U  U3  1  0.411  0.411  0.882  1.0
  U  U4  1  0.821  0.821  0.765  1.0
  U  U5  1  0.240  0.240  0.645  1.0
  U  U6  1  0.525  0.525  0.705  1.0
  U  U7  1  0.943  0.943  0.587  1.0
  U  U8  1  0.647  0.647  0.529  1.0
  U  U9  1  0.353  0.353  0.474  1.0
  U  U10  1  0.057  0.057  0.412  1.0
  U  U11  1  0.476  0.476  0.292  1.0
  U  U12  1  0.759  0.759  0.352  1.0
  U  U13  1  0.178  0.178  0.233  1.0
  U  U14  1  0.881  0.881  0.179  1.0
  U  U15  1  0.583  0.583  0.120  1.0
  U  U16  1  0.300  0.300  0.060  1.0
  O  O17  1  0.274  0.274  0.964  1.0
  O  O18  1  0.986  0.986  0.895  1.0
  O  O19  1  0.691  0.691  0.839  1.0
  O  O20  1  0.430  0.430  0.985  1.0
  O  O21  1  0.132  0.132  0.926  1.0
  O  O22  1  0.394  0.394  0.779  1.0
  O  O23  1  0.837  0.837  0.869  1.0
  O  O24  1  0.550  0.550  0.799  1.0
  O  O25  1  0.812  0.812  0.661  1.0
  O  O26  1  0.243  0.243  0.749  1.0
  O  O27  1  0.515  0.515  0.602  1.0
  O  O28  1  0.963  0.963  0.693  1.0
  O  O29  1  0.221  0.221  0.544  1.0
  O  O30  1  0.656  0.656  0.643  1.0
  O  O31  1  0.927  0.927  0.486  1.0
  O  O32  1  0.629  0.629  0.426  1.0
  O  O33  1  0.368  0.368  0.573  1.0
  O  O34  1  0.074  0.074  0.514  1.0
  O  O35  1  0.048  0.048  0.308  1.0
  O  O36  1  0.786  0.786  0.448  1.0
  O  O37  1  0.749  0.749  0.249  1.0
  O  O38  1  0.478  0.478  0.396  1.0
  O  O39  1  0.455  0.455  0.193  1.0
  O  O40  1  0.196  0.196  0.339  1.0
  O  O41  1  0.166  0.166  0.123  1.0
  O  O42  1  0.893  0.893  0.288  1.0
  O  O43  1  0.604  0.604  0.218  1.0
  O  O44  1  0.863  0.863  0.073  1.0
  O  O45  1  0.310  0.310  0.162  1.0
  O  O46  1  0.581  0.581  0.016  1.0
  O  O47  1  0.011  0.011  0.104  1.0
[/CIF]
.