The material described by Gd5Si4 crystallizes in the triclinic P1 space group. There are twenty inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 6-coordinate geometry to one Si(1), one Si(11), one Si(15), one Si(16), one Si(5), and one Si(8) atom. In the second Gd site, Gd(2) is bonded in a 6-coordinate geometry to one Si(12), one Si(15), one Si(16), one Si(2), one Si(6), and one Si(7) atom. In the third Gd site, Gd(3) is bonded in a 6-coordinate geometry to one Si(13), one Si(14), one Si(3), one Si(6), one Si(7), and one Si(9) atom. In the fourth Gd site, Gd(4) is bonded in a 6-coordinate geometry to one Si(1), one Si(10), one Si(13), one Si(14), one Si(4), one Si(5), and one Si(8) atom. In the fifth Gd site, Gd(5) is bonded in a 6-coordinate geometry to one Si(1), one Si(13), one Si(14), one Si(4), one Si(5), one Si(8), and one Si(9) atom. In the sixth Gd site, Gd(6) is bonded in a 6-coordinate geometry to one Si(10), one Si(13), one Si(14), one Si(2), one Si(3), and one Si(6) atom. In the seventh Gd site, Gd(7) is bonded in a 6-coordinate geometry to one Si(11), one Si(15), one Si(16), one Si(2), one Si(3), and one Si(7) atom. In the eighth Gd site, Gd(8) is bonded in a 6-coordinate geometry to one Si(1), one Si(12), one Si(15), one Si(16), one Si(4), one Si(5), and one Si(8) atom. In the ninth Gd site, Gd(9) is bonded in a 6-coordinate geometry to one Si(1), one Si(11), one Si(12), one Si(15), one Si(4), and one Si(8) atom. In the tenth Gd site, Gd(10) is bonded in a 6-coordinate geometry to one Si(11), one Si(12), one Si(16), one Si(2), one Si(3), and one Si(7) atom. In the eleventh Gd site, Gd(11) is bonded in a 6-coordinate geometry to one Si(10), one Si(13), one Si(2), one Si(3), one Si(6), and one Si(9) atom. In the twelfth Gd site, Gd(12) is bonded in a 6-coordinate geometry to one Si(1), one Si(10), one Si(14), one Si(4), one Si(5), and one Si(9) atom. In the thirteenth Gd site, Gd(13) is bonded in a 6-coordinate geometry to one Si(10), one Si(13), one Si(4), one Si(5), one Si(8), and one Si(9) atom. In the fourteenth Gd site, Gd(14) is bonded in a 6-coordinate geometry to one Si(10), one Si(14), one Si(3), one Si(6), one Si(7), and one Si(9) atom. In the fifteenth Gd site, Gd(15) is bonded in a 6-coordinate geometry to one Si(11), one Si(12), one Si(15), one Si(2), one Si(6), and one Si(7) atom. In the sixteenth Gd site, Gd(16) is bonded in a 6-coordinate geometry to one Si(1), one Si(11), one Si(12), one Si(16), one Si(5), and one Si(8) atom. In the seventeenth Gd site, Gd(17) is bonded to one Si(10), one Si(13), one Si(14), one Si(3), one Si(5), and one Si(9) atom to form distorted corner-sharing GdSi6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. In the eighteenth Gd site, Gd(18) is bonded to one Si(10), one Si(13), one Si(14), one Si(4), one Si(6), and one Si(9) atom to form distorted corner-sharing GdSi6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. In the nineteenth Gd site, Gd(19) is bonded to one Si(1), one Si(11), one Si(12), one Si(15), one Si(16), and one Si(7) atom to form distorted corner-sharing GdSi6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. In the twentieth Gd site, Gd(20) is bonded to one Si(11), one Si(12), one Si(15), one Si(16), one Si(2), and one Si(8) atom to form distorted corner-sharing GdSi6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. There are sixteen inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to one Gd(1), one Gd(12), one Gd(16), one Gd(19), one Gd(4), one Gd(5), one Gd(8), one Gd(9), and one Si(5) atom. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to one Gd(10), one Gd(11), one Gd(15), one Gd(2), one Gd(20), one Gd(6), one Gd(7), and one Si(6) atom. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to one Gd(10), one Gd(11), one Gd(14), one Gd(17), one Gd(3), one Gd(6), one Gd(7), and one Si(7) atom. In the fourth Si site, Si(4) is bonded in a 8-coordinate geometry to one Gd(12), one Gd(13), one Gd(18), one Gd(4), one Gd(5), one Gd(8), one Gd(9), and one Si(8) atom. In the fifth Si site, Si(5) is bonded in a 9-coordinate geometry to one Gd(1), one Gd(12), one Gd(13), one Gd(16), one Gd(17), one Gd(4), one Gd(5), one Gd(8), and one Si(1) atom. In the sixth Si site, Si(6) is bonded in a 8-coordinate geometry to one Gd(11), one Gd(14), one Gd(15), one Gd(18), one Gd(2), one Gd(3), one Gd(6), and one Si(2) atom. In the seventh Si site, Si(7) is bonded in a 8-coordinate geometry to one Gd(10), one Gd(14), one Gd(15), one Gd(19), one Gd(2), one Gd(3), one Gd(7), and one Si(3) atom. In the eighth Si site, Si(8) is bonded in a 9-coordinate geometry to one Gd(1), one Gd(13), one Gd(16), one Gd(20), one Gd(4), one Gd(5), one Gd(8), one Gd(9), and one Si(4) atom. In the ninth Si site, Si(9) is bonded in a 9-coordinate geometry to one Gd(11), one Gd(12), one Gd(13), one Gd(14), one Gd(17), one Gd(18), one Gd(3), one Gd(5), and one Si(13) atom. In the tenth Si site, Si(10) is bonded in a 9-coordinate geometry to one Gd(11), one Gd(12), one Gd(13), one Gd(14), one Gd(17), one Gd(18), one Gd(4), one Gd(6), and one Si(14) atom. In the eleventh Si site, Si(11) is bonded in a 9-coordinate geometry to one Gd(1), one Gd(10), one Gd(15), one Gd(16), one Gd(19), one Gd(20), one Gd(7), one Gd(9), and one Si(15) atom. In the twelfth Si site, Si(12) is bonded in a 9-coordinate geometry to one Gd(10), one Gd(15), one Gd(16), one Gd(19), one Gd(2), one Gd(20), one Gd(8), one Gd(9), and one Si(16) atom. In the thirteenth Si site, Si(13) is bonded in a 9-coordinate geometry to one Gd(11), one Gd(13), one Gd(17), one Gd(18), one Gd(3), one Gd(4), one Gd(5), one Gd(6), and one Si(9) atom. In the fourteenth Si site, Si(14) is bonded in a 9-coordinate geometry to one Gd(12), one Gd(14), one Gd(17), one Gd(18), one Gd(3), one Gd(4), one Gd(5), one Gd(6), and one Si(10) atom. In the fifteenth Si site, Si(15) is bonded in a 9-coordinate geometry to one Gd(1), one Gd(15), one Gd(19), one Gd(2), one Gd(20), one Gd(7), one Gd(8), one Gd(9), and one Si(11) atom. In the sixteenth Si site, Si(16) is bonded in a 9-coordinate geometry to one Gd(1), one Gd(10), one Gd(16), one Gd(19), one Gd(2), one Gd(20), one Gd(7), one Gd(8), and one Si(12) atom. is represented by the CIF card [CIF]
data_Gd5Si4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.517
_cell_length_b   7.770
_cell_length_c   14.805
_cell_angle_alpha   90.018
_cell_angle_beta   89.993
_cell_angle_gamma   90.064
_symmetry_Int_Tables_number   1
_cell_volume   864.711
_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  0.471  0.683  0.597  1.0
  Gd  Gd1  1  0.972  0.816  0.901  1.0
  Gd  Gd2  1  0.528  0.317  0.098  1.0
  Gd  Gd3  1  0.029  0.183  0.403  1.0
  Gd  Gd4  1  0.529  0.316  0.404  1.0
  Gd  Gd5  1  0.030  0.182  0.098  1.0
  Gd  Gd6  1  0.470  0.683  0.900  1.0
  Gd  Gd7  1  0.971  0.817  0.597  1.0
  Gd  Gd8  1  0.817  0.321  0.622  1.0
  Gd  Gd9  1  0.316  0.179  0.876  1.0
  Gd  Gd10  1  0.183  0.680  0.123  1.0
  Gd  Gd11  1  0.684  0.821  0.379  1.0
  Gd  Gd12  1  0.183  0.680  0.378  1.0
  Gd  Gd13  1  0.684  0.820  0.123  1.0
  Gd  Gd14  1  0.817  0.321  0.876  1.0
  Gd  Gd15  1  0.316  0.180  0.622  1.0
  Gd  Gd16  1  0.355  0.011  0.252  1.0
  Gd  Gd17  1  0.858  0.489  0.252  1.0
  Gd  Gd18  1  0.644  0.987  0.749  1.0
  Gd  Gd19  1  0.144  0.512  0.749  1.0
  Si  Si20  1  0.644  0.028  0.540  1.0
  Si  Si21  1  0.144  0.473  0.959  1.0
  Si  Si22  1  0.356  0.971  0.040  1.0
  Si  Si23  1  0.857  0.528  0.461  1.0
  Si  Si24  1  0.356  0.972  0.460  1.0
  Si  Si25  1  0.857  0.529  0.040  1.0
  Si  Si26  1  0.643  0.027  0.959  1.0
  Si  Si27  1  0.144  0.472  0.540  1.0
  Si  Si28  1  0.478  0.601  0.250  1.0
  Si  Si29  1  0.979  0.899  0.251  1.0
  Si  Si30  1  0.520  0.401  0.749  1.0
  Si  Si31  1  0.021  0.100  0.749  1.0
  Si  Si32  1  0.240  0.375  0.251  1.0
  Si  Si33  1  0.741  0.125  0.251  1.0
  Si  Si34  1  0.760  0.625  0.749  1.0
  Si  Si35  1  0.259  0.874  0.750  1.0
[/CIF]
.
The material described by Gd5Si4 crystallizes in the triclinic P1 space group. There are twenty inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 6-coordinate geometry to one Si(1), one Si(11), one Si(15), one Si(16), one Si(5), and one Si(8) atom. In the second Gd site, Gd(2) is bonded in a 6-coordinate geometry to one Si(12), one Si(15), one Si(16), one Si(2), one Si(6), and one Si(7) atom. In the third Gd site, Gd(3) is bonded in a 6-coordinate geometry to one Si(13), one Si(14), one Si(3), one Si(6), one Si(7), and one Si(9) atom. In the fourth Gd site, Gd(4) is bonded in a 6-coordinate geometry to one Si(1), one Si(10), one Si(13), one Si(14), one Si(4), one Si(5), and one Si(8) atom. In the fifth Gd site, Gd(5) is bonded in a 6-coordinate geometry to one Si(1), one Si(13), one Si(14), one Si(4), one Si(5), one Si(8), and one Si(9) atom. In the sixth Gd site, Gd(6) is bonded in a 6-coordinate geometry to one Si(10), one Si(13), one Si(14), one Si(2), one Si(3), and one Si(6) atom. In the seventh Gd site, Gd(7) is bonded in a 6-coordinate geometry to one Si(11), one Si(15), one Si(16), one Si(2), one Si(3), and one Si(7) atom. In the eighth Gd site, Gd(8) is bonded in a 6-coordinate geometry to one Si(1), one Si(12), one Si(15), one Si(16), one Si(4), one Si(5), and one Si(8) atom. In the ninth Gd site, Gd(9) is bonded in a 6-coordinate geometry to one Si(1), one Si(11), one Si(12), one Si(15), one Si(4), and one Si(8) atom. In the tenth Gd site, Gd(10) is bonded in a 6-coordinate geometry to one Si(11), one Si(12), one Si(16), one Si(2), one Si(3), and one Si(7) atom. In the eleventh Gd site, Gd(11) is bonded in a 6-coordinate geometry to one Si(10), one Si(13), one Si(2), one Si(3), one Si(6), and one Si(9) atom. In the twelfth Gd site, Gd(12) is bonded in a 6-coordinate geometry to one Si(1), one Si(10), one Si(14), one Si(4), one Si(5), and one Si(9) atom. In the thirteenth Gd site, Gd(13) is bonded in a 6-coordinate geometry to one Si(10), one Si(13), one Si(4), one Si(5), one Si(8), and one Si(9) atom. In the fourteenth Gd site, Gd(14) is bonded in a 6-coordinate geometry to one Si(10), one Si(14), one Si(3), one Si(6), one Si(7), and one Si(9) atom. In the fifteenth Gd site, Gd(15) is bonded in a 6-coordinate geometry to one Si(11), one Si(12), one Si(15), one Si(2), one Si(6), and one Si(7) atom. In the sixteenth Gd site, Gd(16) is bonded in a 6-coordinate geometry to one Si(1), one Si(11), one Si(12), one Si(16), one Si(5), and one Si(8) atom. In the seventeenth Gd site, Gd(17) is bonded to one Si(10), one Si(13), one Si(14), one Si(3), one Si(5), and one Si(9) atom to form distorted corner-sharing GdSi6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. In the eighteenth Gd site, Gd(18) is bonded to one Si(10), one Si(13), one Si(14), one Si(4), one Si(6), and one Si(9) atom to form distorted corner-sharing GdSi6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. In the nineteenth Gd site, Gd(19) is bonded to one Si(1), one Si(11), one Si(12), one Si(15), one Si(16), and one Si(7) atom to form distorted corner-sharing GdSi6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. In the twentieth Gd site, Gd(20) is bonded to one Si(11), one Si(12), one Si(15), one Si(16), one Si(2), and one Si(8) atom to form distorted corner-sharing GdSi6 octahedra. The corner-sharing octahedral tilt angles range from 56-57°. There are sixteen inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to one Gd(1), one Gd(12), one Gd(16), one Gd(19), one Gd(4), one Gd(5), one Gd(8), one Gd(9), and one Si(5) atom. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to one Gd(10), one Gd(11), one Gd(15), one Gd(2), one Gd(20), one Gd(6), one Gd(7), and one Si(6) atom. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to one Gd(10), one Gd(11), one Gd(14), one Gd(17), one Gd(3), one Gd(6), one Gd(7), and one Si(7) atom. In the fourth Si site, Si(4) is bonded in a 8-coordinate geometry to one Gd(12), one Gd(13), one Gd(18), one Gd(4), one Gd(5), one Gd(8), one Gd(9), and one Si(8) atom. In the fifth Si site, Si(5) is bonded in a 9-coordinate geometry to one Gd(1), one Gd(12), one Gd(13), one Gd(16), one Gd(17), one Gd(4), one Gd(5), one Gd(8), and one Si(1) atom. In the sixth Si site, Si(6) is bonded in a 8-coordinate geometry to one Gd(11), one Gd(14), one Gd(15), one Gd(18), one Gd(2), one Gd(3), one Gd(6), and one Si(2) atom. In the seventh Si site, Si(7) is bonded in a 8-coordinate geometry to one Gd(10), one Gd(14), one Gd(15), one Gd(19), one Gd(2), one Gd(3), one Gd(7), and one Si(3) atom. In the eighth Si site, Si(8) is bonded in a 9-coordinate geometry to one Gd(1), one Gd(13), one Gd(16), one Gd(20), one Gd(4), one Gd(5), one Gd(8), one Gd(9), and one Si(4) atom. In the ninth Si site, Si(9) is bonded in a 9-coordinate geometry to one Gd(11), one Gd(12), one Gd(13), one Gd(14), one Gd(17), one Gd(18), one Gd(3), one Gd(5), and one Si(13) atom. In the tenth Si site, Si(10) is bonded in a 9-coordinate geometry to one Gd(11), one Gd(12), one Gd(13), one Gd(14), one Gd(17), one Gd(18), one Gd(4), one Gd(6), and one Si(14) atom. In the eleventh Si site, Si(11) is bonded in a 9-coordinate geometry to one Gd(1), one Gd(10), one Gd(15), one Gd(16), one Gd(19), one Gd(20), one Gd(7), one Gd(9), and one Si(15) atom. In the twelfth Si site, Si(12) is bonded in a 9-coordinate geometry to one Gd(10), one Gd(15), one Gd(16), one Gd(19), one Gd(2), one Gd(20), one Gd(8), one Gd(9), and one Si(16) atom. In the thirteenth Si site, Si(13) is bonded in a 9-coordinate geometry to one Gd(11), one Gd(13), one Gd(17), one Gd(18), one Gd(3), one Gd(4), one Gd(5), one Gd(6), and one Si(9) atom. In the fourteenth Si site, Si(14) is bonded in a 9-coordinate geometry to one Gd(12), one Gd(14), one Gd(17), one Gd(18), one Gd(3), one Gd(4), one Gd(5), one Gd(6), and one Si(10) atom. In the fifteenth Si site, Si(15) is bonded in a 9-coordinate geometry to one Gd(1), one Gd(15), one Gd(19), one Gd(2), one Gd(20), one Gd(7), one Gd(8), one Gd(9), and one Si(11) atom. In the sixteenth Si site, Si(16) is bonded in a 9-coordinate geometry to one Gd(1), one Gd(10), one Gd(16), one Gd(19), one Gd(2), one Gd(20), one Gd(7), one Gd(8), and one Si(12) atom. is represented by the CIF card [CIF]
data_Gd5Si4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.517
_cell_length_b   7.770
_cell_length_c   14.805
_cell_angle_alpha   90.018
_cell_angle_beta   89.993
_cell_angle_gamma   90.064
_symmetry_Int_Tables_number   1
_cell_volume   864.711
_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  0.471  0.683  0.597  1.0
  Gd  Gd1  1  0.972  0.816  0.901  1.0
  Gd  Gd2  1  0.528  0.317  0.098  1.0
  Gd  Gd3  1  0.029  0.183  0.403  1.0
  Gd  Gd4  1  0.529  0.316  0.404  1.0
  Gd  Gd5  1  0.030  0.182  0.098  1.0
  Gd  Gd6  1  0.470  0.683  0.900  1.0
  Gd  Gd7  1  0.971  0.817  0.597  1.0
  Gd  Gd8  1  0.817  0.321  0.622  1.0
  Gd  Gd9  1  0.316  0.179  0.876  1.0
  Gd  Gd10  1  0.183  0.680  0.123  1.0
  Gd  Gd11  1  0.684  0.821  0.379  1.0
  Gd  Gd12  1  0.183  0.680  0.378  1.0
  Gd  Gd13  1  0.684  0.820  0.123  1.0
  Gd  Gd14  1  0.817  0.321  0.876  1.0
  Gd  Gd15  1  0.316  0.180  0.622  1.0
  Gd  Gd16  1  0.355  0.011  0.252  1.0
  Gd  Gd17  1  0.858  0.489  0.252  1.0
  Gd  Gd18  1  0.644  0.987  0.749  1.0
  Gd  Gd19  1  0.144  0.512  0.749  1.0
  Si  Si20  1  0.644  0.028  0.540  1.0
  Si  Si21  1  0.144  0.473  0.959  1.0
  Si  Si22  1  0.356  0.971  0.040  1.0
  Si  Si23  1  0.857  0.528  0.461  1.0
  Si  Si24  1  0.356  0.972  0.460  1.0
  Si  Si25  1  0.857  0.529  0.040  1.0
  Si  Si26  1  0.643  0.027  0.959  1.0
  Si  Si27  1  0.144  0.472  0.540  1.0
  Si  Si28  1  0.478  0.601  0.250  1.0
  Si  Si29  1  0.979  0.899  0.251  1.0
  Si  Si30  1  0.520  0.401  0.749  1.0
  Si  Si31  1  0.021  0.100  0.749  1.0
  Si  Si32  1  0.240  0.375  0.251  1.0
  Si  Si33  1  0.741  0.125  0.251  1.0
  Si  Si34  1  0.760  0.625  0.749  1.0
  Si  Si35  1  0.259  0.874  0.750  1.0
[/CIF]
.