The structure described by La5Si4 crystallizes in the orthorhombic C222_1 space group. There are six inequivalent La sites. In the first La site, La(1) is bonded in a 6-coordinate geometry to one Si(1), one Si(3), two equivalent Si(2), and two equivalent Si(4) atoms. In the second La site, La(2) is bonded in a 6-coordinate geometry to one Si(2), one Si(4), two equivalent Si(1), and two equivalent Si(3) atoms. In the third La site, La(3) is bonded to one Si(2), one Si(3), two equivalent Si(1), and two equivalent Si(4) atoms to form a mixture of distorted corner, edge, and face-sharing LaSi6 octahedra. The corner-sharing octahedral tilt angles range from 40-50°. In the fourth La site, La(4) is bonded to one Si(1), one Si(4), two equivalent Si(2), and two equivalent Si(3) atoms to form a mixture of distorted corner, edge, and face-sharing LaSi6 octahedra. The corner-sharing octahedral tilt angles range from 40-50°. In the fifth La site, La(5) is bonded to two equivalent Si(1), two equivalent Si(2), and two equivalent Si(4) atoms to form a mixture of corner and face-sharing LaSi6 octahedra. The corner-sharing octahedral tilt angles range from 42-57°. In the sixth La site, La(6) is bonded to two equivalent Si(1), two equivalent Si(2), and two equivalent Si(3) atoms to form a mixture of corner and face-sharing LaSi6 octahedra. The corner-sharing octahedral tilt angles range from 42-57°. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to one La(1), one La(4), one La(5), one La(6), two equivalent La(2), two equivalent La(3), and one Si(4) atom. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to one La(2), one La(3), one La(5), one La(6), two equivalent La(1), two equivalent La(4), and one Si(3) atom. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to one La(1), one La(3), one La(6), two equivalent La(2), two equivalent La(4), and one Si(2) atom. In the fourth Si site, Si(4) is bonded in a 8-coordinate geometry to one La(2), one La(4), one La(5), two equivalent La(1), two equivalent La(3), and one Si(1) atom. is represented by the CIF card [CIF]
data_La5Si4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.046
_cell_length_b   8.046
_cell_length_c   15.696
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.007
_symmetry_Int_Tables_number   1
_cell_volume   1016.123
_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
  La  La0  1  0.374  0.477  0.375  1.0
  La  La1  1  0.874  0.022  0.375  1.0
  La  La2  1  0.978  0.126  0.125  1.0
  La  La3  1  0.022  0.874  0.625  1.0
  La  La4  1  0.626  0.523  0.875  1.0
  La  La5  1  0.477  0.374  0.625  1.0
  La  La6  1  0.523  0.626  0.125  1.0
  La  La7  1  0.126  0.978  0.875  1.0
  La  La8  1  0.988  0.621  0.053  1.0
  La  La9  1  0.012  0.379  0.553  1.0
  La  La10  1  0.621  0.988  0.947  1.0
  La  La11  1  0.121  0.512  0.802  1.0
  La  La12  1  0.879  0.488  0.302  1.0
  La  La13  1  0.512  0.121  0.198  1.0
  La  La14  1  0.488  0.879  0.698  1.0
  La  La15  1  0.379  0.012  0.447  1.0
  La  La16  1  0.693  0.693  0.500  1.0
  La  La17  1  0.808  0.192  0.750  1.0
  La  La18  1  0.192  0.808  0.250  1.0
  La  La19  1  0.307  0.307  0.000  1.0
  Si  Si20  1  0.080  0.711  0.441  1.0
  Si  Si21  1  0.920  0.289  0.941  1.0
  Si  Si22  1  0.711  0.080  0.559  1.0
  Si  Si23  1  0.211  0.420  0.191  1.0
  Si  Si24  1  0.789  0.580  0.691  1.0
  Si  Si25  1  0.420  0.211  0.809  1.0
  Si  Si26  1  0.580  0.789  0.309  1.0
  Si  Si27  1  0.289  0.920  0.059  1.0
  Si  Si28  1  0.829  0.805  0.794  1.0
  Si  Si29  1  0.171  0.195  0.294  1.0
  Si  Si30  1  0.805  0.829  0.206  1.0
  Si  Si31  1  0.304  0.672  0.544  1.0
  Si  Si32  1  0.696  0.328  0.044  1.0
  Si  Si33  1  0.672  0.304  0.456  1.0
  Si  Si34  1  0.328  0.696  0.956  1.0
  Si  Si35  1  0.195  0.171  0.706  1.0
[/CIF]
.
The structure described by La5Si4 crystallizes in the orthorhombic C222_1 space group. There are six inequivalent La sites. In the first La site, La(1) is bonded in a 6-coordinate geometry to one Si(1), one Si(3), two equivalent Si(2), and two equivalent Si(4) atoms. In the second La site, La(2) is bonded in a 6-coordinate geometry to one Si(2), one Si(4), two equivalent Si(1), and two equivalent Si(3) atoms. In the third La site, La(3) is bonded to one Si(2), one Si(3), two equivalent Si(1), and two equivalent Si(4) atoms to form a mixture of distorted corner, edge, and face-sharing LaSi6 octahedra. The corner-sharing octahedral tilt angles range from 40-50°. In the fourth La site, La(4) is bonded to one Si(1), one Si(4), two equivalent Si(2), and two equivalent Si(3) atoms to form a mixture of distorted corner, edge, and face-sharing LaSi6 octahedra. The corner-sharing octahedral tilt angles range from 40-50°. In the fifth La site, La(5) is bonded to two equivalent Si(1), two equivalent Si(2), and two equivalent Si(4) atoms to form a mixture of corner and face-sharing LaSi6 octahedra. The corner-sharing octahedral tilt angles range from 42-57°. In the sixth La site, La(6) is bonded to two equivalent Si(1), two equivalent Si(2), and two equivalent Si(3) atoms to form a mixture of corner and face-sharing LaSi6 octahedra. The corner-sharing octahedral tilt angles range from 42-57°. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to one La(1), one La(4), one La(5), one La(6), two equivalent La(2), two equivalent La(3), and one Si(4) atom. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to one La(2), one La(3), one La(5), one La(6), two equivalent La(1), two equivalent La(4), and one Si(3) atom. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to one La(1), one La(3), one La(6), two equivalent La(2), two equivalent La(4), and one Si(2) atom. In the fourth Si site, Si(4) is bonded in a 8-coordinate geometry to one La(2), one La(4), one La(5), two equivalent La(1), two equivalent La(3), and one Si(1) atom. is represented by the CIF card [CIF]
data_La5Si4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.046
_cell_length_b   8.046
_cell_length_c   15.696
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.007
_symmetry_Int_Tables_number   1
_cell_volume   1016.123
_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
  La  La0  1  0.374  0.477  0.375  1.0
  La  La1  1  0.874  0.022  0.375  1.0
  La  La2  1  0.978  0.126  0.125  1.0
  La  La3  1  0.022  0.874  0.625  1.0
  La  La4  1  0.626  0.523  0.875  1.0
  La  La5  1  0.477  0.374  0.625  1.0
  La  La6  1  0.523  0.626  0.125  1.0
  La  La7  1  0.126  0.978  0.875  1.0
  La  La8  1  0.988  0.621  0.053  1.0
  La  La9  1  0.012  0.379  0.553  1.0
  La  La10  1  0.621  0.988  0.947  1.0
  La  La11  1  0.121  0.512  0.802  1.0
  La  La12  1  0.879  0.488  0.302  1.0
  La  La13  1  0.512  0.121  0.198  1.0
  La  La14  1  0.488  0.879  0.698  1.0
  La  La15  1  0.379  0.012  0.447  1.0
  La  La16  1  0.693  0.693  0.500  1.0
  La  La17  1  0.808  0.192  0.750  1.0
  La  La18  1  0.192  0.808  0.250  1.0
  La  La19  1  0.307  0.307  0.000  1.0
  Si  Si20  1  0.080  0.711  0.441  1.0
  Si  Si21  1  0.920  0.289  0.941  1.0
  Si  Si22  1  0.711  0.080  0.559  1.0
  Si  Si23  1  0.211  0.420  0.191  1.0
  Si  Si24  1  0.789  0.580  0.691  1.0
  Si  Si25  1  0.420  0.211  0.809  1.0
  Si  Si26  1  0.580  0.789  0.309  1.0
  Si  Si27  1  0.289  0.920  0.059  1.0
  Si  Si28  1  0.829  0.805  0.794  1.0
  Si  Si29  1  0.171  0.195  0.294  1.0
  Si  Si30  1  0.805  0.829  0.206  1.0
  Si  Si31  1  0.304  0.672  0.544  1.0
  Si  Si32  1  0.696  0.328  0.044  1.0
  Si  Si33  1  0.672  0.304  0.456  1.0
  Si  Si34  1  0.328  0.696  0.956  1.0
  Si  Si35  1  0.195  0.171  0.706  1.0
[/CIF]
.