The compound described by U2NiC3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 6-coordinate geometry to two equivalent C(1), three equivalent C(2), and three equivalent C(3) atoms. In the second U site, U(2) is bonded in a 5-coordinate geometry to one C(3), two equivalent C(2), and four equivalent C(1) atoms. Ni(1) is bonded in a 3-coordinate geometry to two equivalent C(1) and two equivalent C(3) atoms. There are three inequivalent C sites. In the first C site, C(1) is bonded in a 9-coordinate geometry to two equivalent U(1), four equivalent U(2), two equivalent Ni(1), and one C(2) atom. In the second C site, C(2) is bonded to two equivalent U(2), three equivalent U(1), and one C(1) atom to form edge-sharing CU5C octahedra. In the third C site, C(3) is bonded in a 6-coordinate geometry to one U(2), three equivalent U(1), and two equivalent Ni(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_U2NiC3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.572
_cell_length_b   6.378
_cell_length_c   13.169
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   300.017
_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
  U  U0  1  0.250  0.751  0.022  1.0
  U  U1  1  0.750  0.249  0.978  1.0
  U  U2  1  0.750  0.749  0.522  1.0
  U  U3  1  0.250  0.251  0.478  1.0
  U  U4  1  0.250  0.623  0.292  1.0
  U  U5  1  0.750  0.377  0.708  1.0
  U  U6  1  0.750  0.877  0.792  1.0
  U  U7  1  0.250  0.123  0.208  1.0
  Ni  Ni8  1  0.250  0.509  0.850  1.0
  Ni  Ni9  1  0.750  0.491  0.150  1.0
  Ni  Ni10  1  0.750  0.991  0.350  1.0
  Ni  Ni11  1  0.250  0.009  0.650  1.0
  C  C12  1  0.250  0.682  0.679  1.0
  C  C13  1  0.750  0.318  0.321  1.0
  C  C14  1  0.750  0.818  0.179  1.0
  C  C15  1  0.250  0.182  0.821  1.0
  C  C16  1  0.250  0.525  0.598  1.0
  C  C17  1  0.750  0.475  0.402  1.0
  C  C18  1  0.750  0.975  0.098  1.0
  C  C19  1  0.250  0.025  0.902  1.0
  C  C20  1  0.250  0.897  0.409  1.0
  C  C21  1  0.750  0.103  0.591  1.0
  C  C22  1  0.750  0.603  0.909  1.0
  C  C23  1  0.250  0.397  0.091  1.0
[/CIF]
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The compound described by U2NiC3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 6-coordinate geometry to two equivalent C(1), three equivalent C(2), and three equivalent C(3) atoms. In the second U site, U(2) is bonded in a 5-coordinate geometry to one C(3), two equivalent C(2), and four equivalent C(1) atoms. Ni(1) is bonded in a 3-coordinate geometry to two equivalent C(1) and two equivalent C(3) atoms. There are three inequivalent C sites. In the first C site, C(1) is bonded in a 9-coordinate geometry to two equivalent U(1), four equivalent U(2), two equivalent Ni(1), and one C(2) atom. In the second C site, C(2) is bonded to two equivalent U(2), three equivalent U(1), and one C(1) atom to form edge-sharing CU5C octahedra. In the third C site, C(3) is bonded in a 6-coordinate geometry to one U(2), three equivalent U(1), and two equivalent Ni(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_U2NiC3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.572
_cell_length_b   6.378
_cell_length_c   13.169
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   300.017
_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
  U  U0  1  0.250  0.751  0.022  1.0
  U  U1  1  0.750  0.249  0.978  1.0
  U  U2  1  0.750  0.749  0.522  1.0
  U  U3  1  0.250  0.251  0.478  1.0
  U  U4  1  0.250  0.623  0.292  1.0
  U  U5  1  0.750  0.377  0.708  1.0
  U  U6  1  0.750  0.877  0.792  1.0
  U  U7  1  0.250  0.123  0.208  1.0
  Ni  Ni8  1  0.250  0.509  0.850  1.0
  Ni  Ni9  1  0.750  0.491  0.150  1.0
  Ni  Ni10  1  0.750  0.991  0.350  1.0
  Ni  Ni11  1  0.250  0.009  0.650  1.0
  C  C12  1  0.250  0.682  0.679  1.0
  C  C13  1  0.750  0.318  0.321  1.0
  C  C14  1  0.750  0.818  0.179  1.0
  C  C15  1  0.250  0.182  0.821  1.0
  C  C16  1  0.250  0.525  0.598  1.0
  C  C17  1  0.750  0.475  0.402  1.0
  C  C18  1  0.750  0.975  0.098  1.0
  C  C19  1  0.250  0.025  0.902  1.0
  C  C20  1  0.250  0.897  0.409  1.0
  C  C21  1  0.750  0.103  0.591  1.0
  C  C22  1  0.750  0.603  0.909  1.0
  C  C23  1  0.250  0.397  0.091  1.0
[/CIF]
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