The material described by Sr3U6O28 crystallizes in the triclinic P1 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(19), one O(24), one O(25), one O(27), one O(4), and one O(6) atom. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(18), one O(2), one O(20), one O(23), one O(26), one O(28), one O(3), and one O(5) atom. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(1), one O(18), one O(19), one O(24), one O(26), one O(28), one O(3), and one O(5) atom. There are six inequivalent U sites. In the first U site, U(1) is bonded in a 6-coordinate geometry to one O(1), one O(13), one O(15), one O(23), one O(7), and one O(9) atom. In the second U site, U(2) is bonded in a 6-coordinate geometry to one O(10), one O(14), one O(16), one O(2), one O(24), and one O(8) atom. In the third U site, U(3) is bonded in a 7-coordinate geometry to one O(10), one O(12), one O(13), one O(16), one O(25), one O(3), and one O(7) atom. In the fourth U site, U(4) is bonded in a 7-coordinate geometry to one O(11), one O(14), one O(15), one O(26), one O(4), one O(8), and one O(9) atom. In the fifth U site, U(5) is bonded in a 6-coordinate geometry to one O(11), one O(13), one O(16), one O(27), one O(5), and one O(7) atom. In the sixth U site, U(6) is bonded in a 6-coordinate geometry to one O(12), one O(14), one O(15), one O(28), one O(6), and one O(8) atom. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), and one U(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Sr(2) and one U(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Sr(2), one Sr(3), and one U(3) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(1) and one U(4) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), and one U(5) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Sr(1) and one U(6) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one U(1), one U(3), and one U(5) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one U(2), one U(4), and one U(6) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one U(1) and one U(4) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one U(2) and one U(3) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one U(4) and one U(5) atom. In the twelfth O site, O(12) is bonded in a distorted bent 150 degrees geometry to one U(3) and one U(6) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 150 degrees geometry to one U(1), one U(3), and one U(5) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 150 degrees geometry to one U(2), one U(4), and one U(6) atom. In the fifteenth O site, O(15) is bonded in a trigonal planar geometry to one U(1), one U(4), and one U(6) atom. In the sixteenth O site, O(16) is bonded in a trigonal planar geometry to one U(2), one U(3), and one U(5) atom. In the seventeenth O site, O(17) is bonded in a bent 120 degrees geometry to one O(19) and one O(21) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one Sr(2), one Sr(3), and one O(22) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(3), and one O(17) atom. In the twentieth O site, O(20) is bonded in a distorted bent 150 degrees geometry to one Sr(2) and one O(22) atom. In the twenty-first O site, O(21) is bonded in a single-bond geometry to one O(17) atom. In the twenty-second O site, O(22) is bonded in a bent 120 degrees geometry to one O(18) and one O(20) atom. In the twenty-third O site, O(23) is bonded in a distorted bent 120 degrees geometry to one Sr(2) and one U(1) atom. In the twenty-fourth O site, O(24) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), and one U(2) atom. In the twenty-fifth O site, O(25) is bonded in a distorted single-bond geometry to one Sr(1) and one U(3) atom. In the twenty-sixth O site, O(26) is bonded in a distorted trigonal planar geometry to one Sr(2), one Sr(3), and one U(4) atom. In the twenty-seventh O site, O(27) is bonded in a 2-coordinate geometry to one Sr(1) and one U(5) atom. In the twenty-eighth O site, O(28) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), and one U(6) atom. is represented by the CIF file [CIF]
data_Sr3U6O28
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.926
_cell_length_b   9.782
_cell_length_c   9.807
_cell_angle_alpha   90.474
_cell_angle_beta   110.488
_cell_angle_gamma   110.526
_symmetry_Int_Tables_number   1
_cell_volume   576.332
_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  0.969  0.912  0.054  1.0
  Sr  Sr1  1  0.023  0.458  0.601  1.0
  Sr  Sr2  1  0.334  0.268  0.406  1.0
  U  U3  1  0.306  0.856  0.482  1.0
  U  U4  1  0.307  0.342  0.997  1.0
  U  U5  1  0.661  0.171  0.807  1.0
  U  U6  1  0.661  0.667  0.312  1.0
  U  U7  1  0.016  0.034  0.661  1.0
  U  U8  1  0.015  0.520  0.175  1.0
  O  O9  1  0.266  0.986  0.337  1.0
  O  O10  1  0.290  0.481  0.867  1.0
  O  O11  1  0.672  0.299  0.659  1.0
  O  O12  1  0.663  0.784  0.161  1.0
  O  O13  1  0.062  0.197  0.551  1.0
  O  O14  1  0.016  0.662  0.047  1.0
  O  O15  1  0.325  0.029  0.641  1.0
  O  O16  1  0.325  0.498  0.172  1.0
  O  O17  1  0.413  0.727  0.361  1.0
  O  O18  1  0.414  0.221  0.867  1.0
  O  O19  1  0.907  0.855  0.484  1.0
  O  O20  1  0.907  0.342  0.996  1.0
  O  O21  1  0.660  0.989  0.602  1.0
  O  O22  1  0.660  0.463  0.128  1.0
  O  O23  1  0.996  0.682  0.325  1.0
  O  O24  1  0.997  0.187  0.820  1.0
  O  O25  1  0.715  0.078  0.217  1.0
  O  O26  1  0.435  0.483  0.622  1.0
  O  O27  1  0.920  0.097  0.233  1.0
  O  O28  1  0.800  0.597  0.738  1.0
  O  O29  1  0.692  0.158  0.308  1.0
  O  O30  1  0.605  0.584  0.726  1.0
  O  O31  1  0.287  0.724  0.619  1.0
  O  O32  1  0.269  0.195  0.125  1.0
  O  O33  1  0.665  0.018  0.922  1.0
  O  O34  1  0.675  0.518  0.439  1.0
  O  O35  1  0.013  0.907  0.803  1.0
  O  O36  1  0.056  0.409  0.337  1.0
[/CIF]
.
The material described by Sr3U6O28 crystallizes in the triclinic P1 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(19), one O(24), one O(25), one O(27), one O(4), and one O(6) atom. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(18), one O(2), one O(20), one O(23), one O(26), one O(28), one O(3), and one O(5) atom. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(1), one O(18), one O(19), one O(24), one O(26), one O(28), one O(3), and one O(5) atom. There are six inequivalent U sites. In the first U site, U(1) is bonded in a 6-coordinate geometry to one O(1), one O(13), one O(15), one O(23), one O(7), and one O(9) atom. In the second U site, U(2) is bonded in a 6-coordinate geometry to one O(10), one O(14), one O(16), one O(2), one O(24), and one O(8) atom. In the third U site, U(3) is bonded in a 7-coordinate geometry to one O(10), one O(12), one O(13), one O(16), one O(25), one O(3), and one O(7) atom. In the fourth U site, U(4) is bonded in a 7-coordinate geometry to one O(11), one O(14), one O(15), one O(26), one O(4), one O(8), and one O(9) atom. In the fifth U site, U(5) is bonded in a 6-coordinate geometry to one O(11), one O(13), one O(16), one O(27), one O(5), and one O(7) atom. In the sixth U site, U(6) is bonded in a 6-coordinate geometry to one O(12), one O(14), one O(15), one O(28), one O(6), and one O(8) atom. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), and one U(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Sr(2) and one U(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Sr(2), one Sr(3), and one U(3) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(1) and one U(4) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), and one U(5) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Sr(1) and one U(6) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one U(1), one U(3), and one U(5) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one U(2), one U(4), and one U(6) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one U(1) and one U(4) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one U(2) and one U(3) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one U(4) and one U(5) atom. In the twelfth O site, O(12) is bonded in a distorted bent 150 degrees geometry to one U(3) and one U(6) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 150 degrees geometry to one U(1), one U(3), and one U(5) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 150 degrees geometry to one U(2), one U(4), and one U(6) atom. In the fifteenth O site, O(15) is bonded in a trigonal planar geometry to one U(1), one U(4), and one U(6) atom. In the sixteenth O site, O(16) is bonded in a trigonal planar geometry to one U(2), one U(3), and one U(5) atom. In the seventeenth O site, O(17) is bonded in a bent 120 degrees geometry to one O(19) and one O(21) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one Sr(2), one Sr(3), and one O(22) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(3), and one O(17) atom. In the twentieth O site, O(20) is bonded in a distorted bent 150 degrees geometry to one Sr(2) and one O(22) atom. In the twenty-first O site, O(21) is bonded in a single-bond geometry to one O(17) atom. In the twenty-second O site, O(22) is bonded in a bent 120 degrees geometry to one O(18) and one O(20) atom. In the twenty-third O site, O(23) is bonded in a distorted bent 120 degrees geometry to one Sr(2) and one U(1) atom. In the twenty-fourth O site, O(24) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), and one U(2) atom. In the twenty-fifth O site, O(25) is bonded in a distorted single-bond geometry to one Sr(1) and one U(3) atom. In the twenty-sixth O site, O(26) is bonded in a distorted trigonal planar geometry to one Sr(2), one Sr(3), and one U(4) atom. In the twenty-seventh O site, O(27) is bonded in a 2-coordinate geometry to one Sr(1) and one U(5) atom. In the twenty-eighth O site, O(28) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), and one U(6) atom. is represented by the CIF file [CIF]
data_Sr3U6O28
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.926
_cell_length_b   9.782
_cell_length_c   9.807
_cell_angle_alpha   90.474
_cell_angle_beta   110.488
_cell_angle_gamma   110.526
_symmetry_Int_Tables_number   1
_cell_volume   576.332
_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  0.969  0.912  0.054  1.0
  Sr  Sr1  1  0.023  0.458  0.601  1.0
  Sr  Sr2  1  0.334  0.268  0.406  1.0
  U  U3  1  0.306  0.856  0.482  1.0
  U  U4  1  0.307  0.342  0.997  1.0
  U  U5  1  0.661  0.171  0.807  1.0
  U  U6  1  0.661  0.667  0.312  1.0
  U  U7  1  0.016  0.034  0.661  1.0
  U  U8  1  0.015  0.520  0.175  1.0
  O  O9  1  0.266  0.986  0.337  1.0
  O  O10  1  0.290  0.481  0.867  1.0
  O  O11  1  0.672  0.299  0.659  1.0
  O  O12  1  0.663  0.784  0.161  1.0
  O  O13  1  0.062  0.197  0.551  1.0
  O  O14  1  0.016  0.662  0.047  1.0
  O  O15  1  0.325  0.029  0.641  1.0
  O  O16  1  0.325  0.498  0.172  1.0
  O  O17  1  0.413  0.727  0.361  1.0
  O  O18  1  0.414  0.221  0.867  1.0
  O  O19  1  0.907  0.855  0.484  1.0
  O  O20  1  0.907  0.342  0.996  1.0
  O  O21  1  0.660  0.989  0.602  1.0
  O  O22  1  0.660  0.463  0.128  1.0
  O  O23  1  0.996  0.682  0.325  1.0
  O  O24  1  0.997  0.187  0.820  1.0
  O  O25  1  0.715  0.078  0.217  1.0
  O  O26  1  0.435  0.483  0.622  1.0
  O  O27  1  0.920  0.097  0.233  1.0
  O  O28  1  0.800  0.597  0.738  1.0
  O  O29  1  0.692  0.158  0.308  1.0
  O  O30  1  0.605  0.584  0.726  1.0
  O  O31  1  0.287  0.724  0.619  1.0
  O  O32  1  0.269  0.195  0.125  1.0
  O  O33  1  0.665  0.018  0.922  1.0
  O  O34  1  0.675  0.518  0.439  1.0
  O  O35  1  0.013  0.907  0.803  1.0
  O  O36  1  0.056  0.409  0.337  1.0
[/CIF]
.