The material described by U3Co2Si7 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 14-coordinate geometry to four equivalent Co(1), two equivalent Si(2), two equivalent Si(3), and six equivalent Si(4) atoms. In the second U site, U(2) is bonded to four equivalent Si(1), four equivalent Si(2), and four equivalent Si(3) atoms to form a mixture of distorted corner and face-sharing USi12 cuboctahedra. Co(1) is bonded in a 5-coordinate geometry to four equivalent U(1), one Si(4), two equivalent Si(2), and two equivalent Si(3) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a square co-planar geometry to four equivalent U(2) and four equivalent Si(2) atoms. In the second Si site, Si(2) is bonded in a 12-coordinate geometry to two equivalent U(1), two equivalent U(2), two equivalent Co(1), two equivalent Si(1), and four equivalent Si(3) atoms. In the third Si site, Si(3) is bonded in a 6-coordinate geometry to two equivalent U(1), two equivalent U(2), two equivalent Co(1), and four equivalent Si(2) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to six equivalent U(1), one Co(1), and two equivalent Si(4) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_U3Co2Si7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.975
_cell_length_b   4.027
_cell_length_c   12.352
_cell_angle_alpha   90.000
_cell_angle_beta   99.259
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   195.118
_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  0.314  0.000  0.628  1.0
  U  U1  1  0.686  0.000  0.372  1.0
  U  U2  1  0.000  0.500  0.000  1.0
  Co  Co3  1  0.129  0.500  0.257  1.0
  Co  Co4  1  0.871  0.500  0.743  1.0
  Si  Si5  1  0.500  0.000  0.000  1.0
  Si  Si6  1  0.413  0.500  0.826  1.0
  Si  Si7  1  0.587  0.500  0.174  1.0
  Si  Si8  1  0.088  0.000  0.175  1.0
  Si  Si9  1  0.912  0.000  0.825  1.0
  Si  Si10  1  0.222  0.500  0.444  1.0
  Si  Si11  1  0.778  0.500  0.556  1.0
[/CIF]
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The material described by U3Co2Si7 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 14-coordinate geometry to four equivalent Co(1), two equivalent Si(2), two equivalent Si(3), and six equivalent Si(4) atoms. In the second U site, U(2) is bonded to four equivalent Si(1), four equivalent Si(2), and four equivalent Si(3) atoms to form a mixture of distorted corner and face-sharing USi12 cuboctahedra. Co(1) is bonded in a 5-coordinate geometry to four equivalent U(1), one Si(4), two equivalent Si(2), and two equivalent Si(3) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a square co-planar geometry to four equivalent U(2) and four equivalent Si(2) atoms. In the second Si site, Si(2) is bonded in a 12-coordinate geometry to two equivalent U(1), two equivalent U(2), two equivalent Co(1), two equivalent Si(1), and four equivalent Si(3) atoms. In the third Si site, Si(3) is bonded in a 6-coordinate geometry to two equivalent U(1), two equivalent U(2), two equivalent Co(1), and four equivalent Si(2) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to six equivalent U(1), one Co(1), and two equivalent Si(4) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_U3Co2Si7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.975
_cell_length_b   4.027
_cell_length_c   12.352
_cell_angle_alpha   90.000
_cell_angle_beta   99.259
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   195.118
_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  0.314  0.000  0.628  1.0
  U  U1  1  0.686  0.000  0.372  1.0
  U  U2  1  0.000  0.500  0.000  1.0
  Co  Co3  1  0.129  0.500  0.257  1.0
  Co  Co4  1  0.871  0.500  0.743  1.0
  Si  Si5  1  0.500  0.000  0.000  1.0
  Si  Si6  1  0.413  0.500  0.826  1.0
  Si  Si7  1  0.587  0.500  0.174  1.0
  Si  Si8  1  0.088  0.000  0.175  1.0
  Si  Si9  1  0.912  0.000  0.825  1.0
  Si  Si10  1  0.222  0.500  0.444  1.0
  Si  Si11  1  0.778  0.500  0.556  1.0
[/CIF]
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