The crystal structure described by U3Si2C2 crystallizes in the tetragonal I4/mmm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 5-coordinate geometry to one U(2) and five equivalent C(1) atoms. In the second U site, U(2) is bonded in a 10-coordinate geometry to two equivalent U(1) and eight equivalent Si(1) atoms. Si(1) is bonded in a single-bond geometry to four equivalent U(2) and one C(1) atom. C(1) is bonded to five equivalent U(1) and one Si(1) atom to form a mixture of distorted corner and edge-sharing CU5Si octahedra. The corner-sharing octahedral tilt angles are 18°. is represented by the CIF card [CIF]
data_U3(SiC)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.757
_cell_length_b   8.757
_cell_length_c   8.757
_cell_angle_alpha   155.893
_cell_angle_beta   155.893
_cell_angle_gamma   34.354
_symmetry_Int_Tables_number   1
_cell_volume   111.929
_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  0.828  0.828  0.000  1.0
  U  U1  1  0.172  0.172  0.000  1.0
  U  U2  1  0.000  0.000  0.000  1.0
  Si  Si3  1  0.583  0.583  0.000  1.0
  Si  Si4  1  0.417  0.417  0.000  1.0
  C  C5  1  0.696  0.696  0.000  1.0
  C  C6  1  0.304  0.304  0.000  1.0
[/CIF]
.
The crystal structure described by U3Si2C2 crystallizes in the tetragonal I4/mmm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 5-coordinate geometry to one U(2) and five equivalent C(1) atoms. In the second U site, U(2) is bonded in a 10-coordinate geometry to two equivalent U(1) and eight equivalent Si(1) atoms. Si(1) is bonded in a single-bond geometry to four equivalent U(2) and one C(1) atom. C(1) is bonded to five equivalent U(1) and one Si(1) atom to form a mixture of distorted corner and edge-sharing CU5Si octahedra. The corner-sharing octahedral tilt angles are 18°. is represented by the CIF card [CIF]
data_U3(SiC)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.757
_cell_length_b   8.757
_cell_length_c   8.757
_cell_angle_alpha   155.893
_cell_angle_beta   155.893
_cell_angle_gamma   34.354
_symmetry_Int_Tables_number   1
_cell_volume   111.929
_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  0.828  0.828  0.000  1.0
  U  U1  1  0.172  0.172  0.000  1.0
  U  U2  1  0.000  0.000  0.000  1.0
  Si  Si3  1  0.583  0.583  0.000  1.0
  Si  Si4  1  0.417  0.417  0.000  1.0
  C  C5  1  0.696  0.696  0.000  1.0
  C  C6  1  0.304  0.304  0.000  1.0
[/CIF]
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