The material structure described by Gd4Ni2BiSi2 crystallizes in the orthorhombic Pnma space group. There are four inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 6-coordinate geometry to one Ni(2), two equivalent Ni(1), one Si(2), two equivalent Si(1), and two equivalent Bi(1) atoms. In the second Gd site, Gd(2) is bonded in a 6-coordinate geometry to one Ni(2), two equivalent Si(1), and three equivalent Bi(1) atoms. In the third Gd site, Gd(3) is bonded in a 8-coordinate geometry to one Ni(1), two equivalent Ni(2), two equivalent Si(1), two equivalent Si(2), and one Bi(1) atom. In the fourth Gd site, Gd(4) is bonded in a 11-coordinate geometry to two equivalent Ni(2), three equivalent Ni(1), one Si(1), three equivalent Si(2), and two equivalent Bi(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 10-coordinate geometry to one Gd(3), two equivalent Gd(1), three equivalent Gd(4), three equivalent Si(2), and one Bi(1) atom. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to one Gd(1), one Gd(2), two equivalent Gd(3), two equivalent Gd(4), one Si(2), and two equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to one Gd(4), two equivalent Gd(1), two equivalent Gd(2), two equivalent Gd(3), and two equivalent Ni(2) atoms. In the second Si site, Si(2) is bonded in a 10-coordinate geometry to one Gd(1), two equivalent Gd(3), three equivalent Gd(4), one Ni(2), and three equivalent Ni(1) atoms. Bi(1) is bonded in a 9-coordinate geometry to one Gd(3), two equivalent Gd(1), two equivalent Gd(4), three equivalent Gd(2), and one Ni(1) atom. is represented by the CIF card [CIF]
data_Gd4Si2Ni2Bi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.215
_cell_length_b   11.336
_cell_length_c   16.842
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   804.836
_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
  Gd  Gd0  1  0.750  0.803  0.188  1.0
  Gd  Gd1  1  0.250  0.197  0.812  1.0
  Gd  Gd2  1  0.250  0.697  0.688  1.0
  Gd  Gd3  1  0.750  0.303  0.312  1.0
  Gd  Gd4  1  0.750  0.953  0.397  1.0
  Gd  Gd5  1  0.250  0.047  0.603  1.0
  Gd  Gd6  1  0.250  0.547  0.897  1.0
  Gd  Gd7  1  0.750  0.453  0.103  1.0
  Gd  Gd8  1  0.750  0.941  0.778  1.0
  Gd  Gd9  1  0.250  0.059  0.222  1.0
  Gd  Gd10  1  0.250  0.559  0.278  1.0
  Gd  Gd11  1  0.750  0.441  0.722  1.0
  Gd  Gd12  1  0.750  0.814  0.969  1.0
  Gd  Gd13  1  0.250  0.186  0.031  1.0
  Gd  Gd14  1  0.250  0.686  0.469  1.0
  Gd  Gd15  1  0.750  0.314  0.531  1.0
  Si  Si16  1  0.750  0.683  0.814  1.0
  Si  Si17  1  0.250  0.317  0.186  1.0
  Si  Si18  1  0.250  0.817  0.314  1.0
  Si  Si19  1  0.750  0.183  0.686  1.0
  Si  Si20  1  0.750  0.521  0.408  1.0
  Si  Si21  1  0.250  0.479  0.592  1.0
  Si  Si22  1  0.250  0.979  0.908  1.0
  Si  Si23  1  0.750  0.021  0.092  1.0
  Ni  Ni24  1  0.750  0.563  0.560  1.0
  Ni  Ni25  1  0.250  0.437  0.440  1.0
  Ni  Ni26  1  0.250  0.937  0.060  1.0
  Ni  Ni27  1  0.750  0.063  0.940  1.0
  Ni  Ni28  1  0.750  0.711  0.346  1.0
  Ni  Ni29  1  0.250  0.289  0.654  1.0
  Ni  Ni30  1  0.250  0.789  0.846  1.0
  Ni  Ni31  1  0.750  0.211  0.154  1.0
  Bi  Bi32  1  0.750  0.837  0.578  1.0
  Bi  Bi33  1  0.250  0.163  0.422  1.0
  Bi  Bi34  1  0.250  0.663  0.078  1.0
  Bi  Bi35  1  0.750  0.337  0.922  1.0
[/CIF]
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The material structure described by Gd4Ni2BiSi2 crystallizes in the orthorhombic Pnma space group. There are four inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 6-coordinate geometry to one Ni(2), two equivalent Ni(1), one Si(2), two equivalent Si(1), and two equivalent Bi(1) atoms. In the second Gd site, Gd(2) is bonded in a 6-coordinate geometry to one Ni(2), two equivalent Si(1), and three equivalent Bi(1) atoms. In the third Gd site, Gd(3) is bonded in a 8-coordinate geometry to one Ni(1), two equivalent Ni(2), two equivalent Si(1), two equivalent Si(2), and one Bi(1) atom. In the fourth Gd site, Gd(4) is bonded in a 11-coordinate geometry to two equivalent Ni(2), three equivalent Ni(1), one Si(1), three equivalent Si(2), and two equivalent Bi(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 10-coordinate geometry to one Gd(3), two equivalent Gd(1), three equivalent Gd(4), three equivalent Si(2), and one Bi(1) atom. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to one Gd(1), one Gd(2), two equivalent Gd(3), two equivalent Gd(4), one Si(2), and two equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to one Gd(4), two equivalent Gd(1), two equivalent Gd(2), two equivalent Gd(3), and two equivalent Ni(2) atoms. In the second Si site, Si(2) is bonded in a 10-coordinate geometry to one Gd(1), two equivalent Gd(3), three equivalent Gd(4), one Ni(2), and three equivalent Ni(1) atoms. Bi(1) is bonded in a 9-coordinate geometry to one Gd(3), two equivalent Gd(1), two equivalent Gd(4), three equivalent Gd(2), and one Ni(1) atom. is represented by the CIF card [CIF]
data_Gd4Si2Ni2Bi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.215
_cell_length_b   11.336
_cell_length_c   16.842
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   804.836
_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
  Gd  Gd0  1  0.750  0.803  0.188  1.0
  Gd  Gd1  1  0.250  0.197  0.812  1.0
  Gd  Gd2  1  0.250  0.697  0.688  1.0
  Gd  Gd3  1  0.750  0.303  0.312  1.0
  Gd  Gd4  1  0.750  0.953  0.397  1.0
  Gd  Gd5  1  0.250  0.047  0.603  1.0
  Gd  Gd6  1  0.250  0.547  0.897  1.0
  Gd  Gd7  1  0.750  0.453  0.103  1.0
  Gd  Gd8  1  0.750  0.941  0.778  1.0
  Gd  Gd9  1  0.250  0.059  0.222  1.0
  Gd  Gd10  1  0.250  0.559  0.278  1.0
  Gd  Gd11  1  0.750  0.441  0.722  1.0
  Gd  Gd12  1  0.750  0.814  0.969  1.0
  Gd  Gd13  1  0.250  0.186  0.031  1.0
  Gd  Gd14  1  0.250  0.686  0.469  1.0
  Gd  Gd15  1  0.750  0.314  0.531  1.0
  Si  Si16  1  0.750  0.683  0.814  1.0
  Si  Si17  1  0.250  0.317  0.186  1.0
  Si  Si18  1  0.250  0.817  0.314  1.0
  Si  Si19  1  0.750  0.183  0.686  1.0
  Si  Si20  1  0.750  0.521  0.408  1.0
  Si  Si21  1  0.250  0.479  0.592  1.0
  Si  Si22  1  0.250  0.979  0.908  1.0
  Si  Si23  1  0.750  0.021  0.092  1.0
  Ni  Ni24  1  0.750  0.563  0.560  1.0
  Ni  Ni25  1  0.250  0.437  0.440  1.0
  Ni  Ni26  1  0.250  0.937  0.060  1.0
  Ni  Ni27  1  0.750  0.063  0.940  1.0
  Ni  Ni28  1  0.750  0.711  0.346  1.0
  Ni  Ni29  1  0.250  0.289  0.654  1.0
  Ni  Ni30  1  0.250  0.789  0.846  1.0
  Ni  Ni31  1  0.750  0.211  0.154  1.0
  Bi  Bi32  1  0.750  0.837  0.578  1.0
  Bi  Bi33  1  0.250  0.163  0.422  1.0
  Bi  Bi34  1  0.250  0.663  0.078  1.0
  Bi  Bi35  1  0.750  0.337  0.922  1.0
[/CIF]
.