The material structure described by UCe2Se5 crystallizes in the orthorhombic Pnma space group. U(1) is bonded to one Se(1), one Se(2), one Se(3), and four equivalent Se(4) atoms to form distorted edge-sharing USe7 pentagonal bipyramids. Ce(1) is bonded in a 8-coordinate geometry to two equivalent Se(1), two equivalent Se(2), two equivalent Se(3), and two equivalent Se(4) atoms. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to one U(1) and four equivalent Ce(1) atoms to form distorted SeCe4U square pyramids that share corners with four equivalent Se(1)Ce4U square pyramids, corners with four equivalent Se(2)Ce4U square pyramids,  a cornercorner with one Se(3)Ce4U trigonal bipyramid, corners with four equivalent Se(4)Ce2U2 trigonal pyramids,  an edgeedge with one Se(2)Ce4U square pyramid, edges with four equivalent Se(3)Ce4U trigonal bipyramids, edges with four equivalent Se(4)Ce2U2 trigonal pyramids, and  a faceface with one Se(2)Ce4U square pyramid. In the second Se site, Se(2) is bonded to one U(1) and four equivalent Ce(1) atoms to form SeCe4U square pyramids that share corners with four equivalent Se(1)Ce4U square pyramids, corners with five equivalent Se(3)Ce4U trigonal bipyramids, corners with eight equivalent Se(4)Ce2U2 trigonal pyramids,  an edgeedge with one Se(1)Ce4U square pyramid, edges with two equivalent Se(2)Ce4U square pyramids, edges with two equivalent Se(3)Ce4U trigonal bipyramids, edges with two equivalent Se(4)Ce2U2 trigonal pyramids, and  a faceface with one Se(1)Ce4U square pyramid. In the third Se site, Se(3) is bonded to one U(1) and four equivalent Ce(1) atoms to form distorted SeCe4U trigonal bipyramids that share  a cornercorner with one Se(1)Ce4U square pyramid, corners with five equivalent Se(2)Ce4U square pyramids, corners with four equivalent Se(3)Ce4U trigonal bipyramids, corners with four equivalent Se(4)Ce2U2 trigonal pyramids, edges with two equivalent Se(2)Ce4U square pyramids, edges with four equivalent Se(1)Ce4U square pyramids, and edges with four equivalent Se(4)Ce2U2 trigonal pyramids. In the fourth Se site, Se(4) is bonded to two equivalent U(1) and two equivalent Ce(1) atoms to form distorted SeCe2U2 trigonal pyramids that share corners with two equivalent Se(1)Ce4U square pyramids, corners with four equivalent Se(2)Ce4U square pyramids, corners with two equivalent Se(3)Ce4U trigonal bipyramids, corners with six equivalent Se(4)Ce2U2 trigonal pyramids,  an edgeedge with one Se(2)Ce4U square pyramid, edges with two equivalent Se(1)Ce4U square pyramids, edges with two equivalent Se(3)Ce4U trigonal bipyramids, and  an edgeedge with one Se(4)Ce2U2 trigonal pyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ce2USe5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.902
_cell_length_b   8.549
_cell_length_c   12.429
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   839.617
_cell_formula_units_Z   4
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
  Ce  Ce0  1  0.473  0.499  0.323  1.0
  Ce  Ce1  1  0.973  0.501  0.177  1.0
  Ce  Ce2  1  0.027  0.001  0.823  1.0
  Ce  Ce3  1  0.527  0.999  0.677  1.0
  Ce  Ce4  1  0.527  0.501  0.677  1.0
  Ce  Ce5  1  0.027  0.499  0.823  1.0
  Ce  Ce6  1  0.973  0.999  0.177  1.0
  Ce  Ce7  1  0.473  0.001  0.323  1.0
  U  U8  1  0.927  0.750  0.491  1.0
  U  U9  1  0.427  0.250  0.009  1.0
  U  U10  1  0.573  0.750  0.991  1.0
  U  U11  1  0.073  0.250  0.509  1.0
  Se  Se12  1  0.808  0.750  0.716  1.0
  Se  Se13  1  0.308  0.250  0.784  1.0
  Se  Se14  1  0.692  0.750  0.216  1.0
  Se  Se15  1  0.192  0.250  0.284  1.0
  Se  Se16  1  0.543  0.750  0.500  1.0
  Se  Se17  1  0.043  0.250  0.000  1.0
  Se  Se18  1  0.957  0.750  1.000  1.0
  Se  Se19  1  0.457  0.250  0.500  1.0
  Se  Se20  1  0.166  0.750  0.313  1.0
  Se  Se21  1  0.666  0.250  0.187  1.0
  Se  Se22  1  0.334  0.750  0.813  1.0
  Se  Se23  1  0.834  0.250  0.687  1.0
  Se  Se24  1  0.165  0.958  0.594  1.0
  Se  Se25  1  0.665  0.042  0.906  1.0
  Se  Se26  1  0.335  0.542  0.094  1.0
  Se  Se27  1  0.835  0.458  0.406  1.0
  Se  Se28  1  0.835  0.042  0.406  1.0
  Se  Se29  1  0.335  0.958  0.094  1.0
  Se  Se30  1  0.665  0.458  0.906  1.0
  Se  Se31  1  0.165  0.542  0.594  1.0
[/CIF]
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The material structure described by UCe2Se5 crystallizes in the orthorhombic Pnma space group. U(1) is bonded to one Se(1), one Se(2), one Se(3), and four equivalent Se(4) atoms to form distorted edge-sharing USe7 pentagonal bipyramids. Ce(1) is bonded in a 8-coordinate geometry to two equivalent Se(1), two equivalent Se(2), two equivalent Se(3), and two equivalent Se(4) atoms. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to one U(1) and four equivalent Ce(1) atoms to form distorted SeCe4U square pyramids that share corners with four equivalent Se(1)Ce4U square pyramids, corners with four equivalent Se(2)Ce4U square pyramids,  a cornercorner with one Se(3)Ce4U trigonal bipyramid, corners with four equivalent Se(4)Ce2U2 trigonal pyramids,  an edgeedge with one Se(2)Ce4U square pyramid, edges with four equivalent Se(3)Ce4U trigonal bipyramids, edges with four equivalent Se(4)Ce2U2 trigonal pyramids, and  a faceface with one Se(2)Ce4U square pyramid. In the second Se site, Se(2) is bonded to one U(1) and four equivalent Ce(1) atoms to form SeCe4U square pyramids that share corners with four equivalent Se(1)Ce4U square pyramids, corners with five equivalent Se(3)Ce4U trigonal bipyramids, corners with eight equivalent Se(4)Ce2U2 trigonal pyramids,  an edgeedge with one Se(1)Ce4U square pyramid, edges with two equivalent Se(2)Ce4U square pyramids, edges with two equivalent Se(3)Ce4U trigonal bipyramids, edges with two equivalent Se(4)Ce2U2 trigonal pyramids, and  a faceface with one Se(1)Ce4U square pyramid. In the third Se site, Se(3) is bonded to one U(1) and four equivalent Ce(1) atoms to form distorted SeCe4U trigonal bipyramids that share  a cornercorner with one Se(1)Ce4U square pyramid, corners with five equivalent Se(2)Ce4U square pyramids, corners with four equivalent Se(3)Ce4U trigonal bipyramids, corners with four equivalent Se(4)Ce2U2 trigonal pyramids, edges with two equivalent Se(2)Ce4U square pyramids, edges with four equivalent Se(1)Ce4U square pyramids, and edges with four equivalent Se(4)Ce2U2 trigonal pyramids. In the fourth Se site, Se(4) is bonded to two equivalent U(1) and two equivalent Ce(1) atoms to form distorted SeCe2U2 trigonal pyramids that share corners with two equivalent Se(1)Ce4U square pyramids, corners with four equivalent Se(2)Ce4U square pyramids, corners with two equivalent Se(3)Ce4U trigonal bipyramids, corners with six equivalent Se(4)Ce2U2 trigonal pyramids,  an edgeedge with one Se(2)Ce4U square pyramid, edges with two equivalent Se(1)Ce4U square pyramids, edges with two equivalent Se(3)Ce4U trigonal bipyramids, and  an edgeedge with one Se(4)Ce2U2 trigonal pyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ce2USe5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.902
_cell_length_b   8.549
_cell_length_c   12.429
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   839.617
_cell_formula_units_Z   4
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
  Ce  Ce0  1  0.473  0.499  0.323  1.0
  Ce  Ce1  1  0.973  0.501  0.177  1.0
  Ce  Ce2  1  0.027  0.001  0.823  1.0
  Ce  Ce3  1  0.527  0.999  0.677  1.0
  Ce  Ce4  1  0.527  0.501  0.677  1.0
  Ce  Ce5  1  0.027  0.499  0.823  1.0
  Ce  Ce6  1  0.973  0.999  0.177  1.0
  Ce  Ce7  1  0.473  0.001  0.323  1.0
  U  U8  1  0.927  0.750  0.491  1.0
  U  U9  1  0.427  0.250  0.009  1.0
  U  U10  1  0.573  0.750  0.991  1.0
  U  U11  1  0.073  0.250  0.509  1.0
  Se  Se12  1  0.808  0.750  0.716  1.0
  Se  Se13  1  0.308  0.250  0.784  1.0
  Se  Se14  1  0.692  0.750  0.216  1.0
  Se  Se15  1  0.192  0.250  0.284  1.0
  Se  Se16  1  0.543  0.750  0.500  1.0
  Se  Se17  1  0.043  0.250  0.000  1.0
  Se  Se18  1  0.957  0.750  1.000  1.0
  Se  Se19  1  0.457  0.250  0.500  1.0
  Se  Se20  1  0.166  0.750  0.313  1.0
  Se  Se21  1  0.666  0.250  0.187  1.0
  Se  Se22  1  0.334  0.750  0.813  1.0
  Se  Se23  1  0.834  0.250  0.687  1.0
  Se  Se24  1  0.165  0.958  0.594  1.0
  Se  Se25  1  0.665  0.042  0.906  1.0
  Se  Se26  1  0.335  0.542  0.094  1.0
  Se  Se27  1  0.835  0.458  0.406  1.0
  Se  Se28  1  0.835  0.042  0.406  1.0
  Se  Se29  1  0.335  0.958  0.094  1.0
  Se  Se30  1  0.665  0.458  0.906  1.0
  Se  Se31  1  0.165  0.542  0.594  1.0
[/CIF]
.