The material described by Dy3Si4 crystallizes in the monoclinic Cm space group. There are twelve inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 7-coordinate geometry to one Si(7), two equivalent Si(1), and four equivalent Si(10) atoms. In the second Dy site, Dy(2) is bonded in a 7-coordinate geometry to one Si(8), two equivalent Si(2), and four equivalent Si(11) atoms. In the third Dy site, Dy(3) is bonded in a 7-coordinate geometry to one Si(9), two equivalent Si(3), and four equivalent Si(12) atoms. In the fourth Dy site, Dy(4) is bonded in a 7-coordinate geometry to one Si(10), two equivalent Si(4), and four equivalent Si(7) atoms. In the fifth Dy site, Dy(5) is bonded in a 7-coordinate geometry to one Si(11), two equivalent Si(5), and four equivalent Si(8) atoms. In the sixth Dy site, Dy(6) is bonded in a 7-coordinate geometry to one Si(12), two equivalent Si(6), and four equivalent Si(9) atoms. In the seventh Dy site, Dy(7) is bonded to two equivalent Si(15), two equivalent Si(7), four equivalent Si(16), and four equivalent Si(4) atoms to form a mixture of distorted face and edge-sharing DySi12 cuboctahedra. In the eighth Dy site, Dy(8) is bonded in a 8-coordinate geometry to two equivalent Si(13), two equivalent Si(8), and four equivalent Si(5) atoms. In the ninth Dy site, Dy(9) is bonded to two equivalent Si(14), two equivalent Si(9), and four equivalent Si(6) atoms to form a mixture of distorted face, corner, and edge-sharing DySi8 hexagonal bipyramids. In the tenth Dy site, Dy(10) is bonded in a 10-coordinate geometry to two equivalent Si(10), four equivalent Si(1), and four equivalent Si(13) atoms. In the eleventh Dy site, Dy(11) is bonded in a 10-coordinate geometry to two equivalent Si(11), four equivalent Si(14), and four equivalent Si(2) atoms. In the twelfth Dy site, Dy(12) is bonded to two equivalent Si(12), two equivalent Si(16), four equivalent Si(15), and four equivalent Si(3) atoms to form a mixture of distorted face and edge-sharing DySi12 cuboctahedra. There are sixteen inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Dy(1), four equivalent Dy(10), one Si(13), and two equivalent Si(10) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Dy(2), four equivalent Dy(11), one Si(14), and two equivalent Si(11) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Dy(3), four equivalent Dy(12), one Si(15), and two equivalent Si(12) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to two equivalent Dy(4), four equivalent Dy(7), one Si(16), and two equivalent Si(7) atoms. In the fifth Si site, Si(5) is bonded in a 8-coordinate geometry to two equivalent Dy(5), four equivalent Dy(8), and two equivalent Si(8) atoms. In the sixth Si site, Si(6) is bonded in a 8-coordinate geometry to two equivalent Dy(6), four equivalent Dy(9), and two equivalent Si(9) atoms. In the seventh Si site, Si(7) is bonded in a 9-coordinate geometry to one Dy(1), two equivalent Dy(7), four equivalent Dy(4), and two equivalent Si(4) atoms. In the eighth Si site, Si(8) is bonded in a 9-coordinate geometry to one Dy(2), two equivalent Dy(8), four equivalent Dy(5), and two equivalent Si(5) atoms. In the ninth Si site, Si(9) is bonded in a 9-coordinate geometry to one Dy(3), two equivalent Dy(9), four equivalent Dy(6), and two equivalent Si(6) atoms. In the tenth Si site, Si(10) is bonded in a 9-coordinate geometry to one Dy(4), two equivalent Dy(10), four equivalent Dy(1), and two equivalent Si(1) atoms. In the eleventh Si site, Si(11) is bonded in a 9-coordinate geometry to one Dy(5), two equivalent Dy(11), four equivalent Dy(2), and two equivalent Si(2) atoms. In the twelfth Si site, Si(12) is bonded in a 9-coordinate geometry to one Dy(6), two equivalent Dy(12), four equivalent Dy(3), and two equivalent Si(3) atoms. In the thirteenth Si site, Si(13) is bonded in a 7-coordinate geometry to two equivalent Dy(8), four equivalent Dy(10), and one Si(1) atom. In the fourteenth Si site, Si(14) is bonded in a 7-coordinate geometry to two equivalent Dy(9), four equivalent Dy(11), and one Si(2) atom. In the fifteenth Si site, Si(15) is bonded in a 9-coordinate geometry to two equivalent Dy(7), four equivalent Dy(12), one Si(3), and two equivalent Si(16) atoms. In the sixteenth Si site, Si(16) is bonded in a 9-coordinate geometry to two equivalent Dy(12), four equivalent Dy(7), one Si(4), and two equivalent Si(15) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Dy3Si4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.878
_cell_length_b   4.148
_cell_length_c   36.409
_cell_angle_alpha   86.735
_cell_angle_beta   90.404
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   584.661
_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
  Dy  Dy0  1  0.253  0.900  0.200  1.0
  Dy  Dy1  1  0.252  0.234  0.533  1.0
  Dy  Dy2  1  0.249  0.568  0.865  1.0
  Dy  Dy3  1  0.751  0.432  0.136  1.0
  Dy  Dy4  1  0.750  0.766  0.468  1.0
  Dy  Dy5  1  0.750  0.100  0.800  1.0
  Dy  Dy6  1  0.251  0.477  0.047  1.0
  Dy  Dy7  1  0.245  0.810  0.381  1.0
  Dy  Dy8  1  0.246  0.143  0.714  1.0
  Dy  Dy9  1  0.767  0.857  0.287  1.0
  Dy  Dy10  1  0.766  0.190  0.620  1.0
  Dy  Dy11  1  0.749  0.523  0.954  1.0
  Si  Si12  1  0.260  0.371  0.259  1.0
  Si  Si13  1  0.260  0.704  0.592  1.0
  Si  Si14  1  0.251  0.040  0.920  1.0
  Si  Si15  1  0.749  0.960  0.080  1.0
  Si  Si16  1  0.747  0.296  0.407  1.0
  Si  Si17  1  0.747  0.630  0.740  1.0
  Si  Si18  1  0.250  0.940  0.120  1.0
  Si  Si19  1  0.250  0.276  0.449  1.0
  Si  Si20  1  0.250  0.609  0.781  1.0
  Si  Si21  1  0.753  0.391  0.218  1.0
  Si  Si22  1  0.752  0.725  0.551  1.0
  Si  Si23  1  0.750  0.060  0.880  1.0
  Si  Si24  1  0.304  0.338  0.323  1.0
  Si  Si25  1  0.307  0.672  0.656  1.0
  Si  Si26  1  0.249  0.008  0.983  1.0
  Si  Si27  1  0.751  0.992  0.017  1.0
[/CIF]
.
The material described by Dy3Si4 crystallizes in the monoclinic Cm space group. There are twelve inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 7-coordinate geometry to one Si(7), two equivalent Si(1), and four equivalent Si(10) atoms. In the second Dy site, Dy(2) is bonded in a 7-coordinate geometry to one Si(8), two equivalent Si(2), and four equivalent Si(11) atoms. In the third Dy site, Dy(3) is bonded in a 7-coordinate geometry to one Si(9), two equivalent Si(3), and four equivalent Si(12) atoms. In the fourth Dy site, Dy(4) is bonded in a 7-coordinate geometry to one Si(10), two equivalent Si(4), and four equivalent Si(7) atoms. In the fifth Dy site, Dy(5) is bonded in a 7-coordinate geometry to one Si(11), two equivalent Si(5), and four equivalent Si(8) atoms. In the sixth Dy site, Dy(6) is bonded in a 7-coordinate geometry to one Si(12), two equivalent Si(6), and four equivalent Si(9) atoms. In the seventh Dy site, Dy(7) is bonded to two equivalent Si(15), two equivalent Si(7), four equivalent Si(16), and four equivalent Si(4) atoms to form a mixture of distorted face and edge-sharing DySi12 cuboctahedra. In the eighth Dy site, Dy(8) is bonded in a 8-coordinate geometry to two equivalent Si(13), two equivalent Si(8), and four equivalent Si(5) atoms. In the ninth Dy site, Dy(9) is bonded to two equivalent Si(14), two equivalent Si(9), and four equivalent Si(6) atoms to form a mixture of distorted face, corner, and edge-sharing DySi8 hexagonal bipyramids. In the tenth Dy site, Dy(10) is bonded in a 10-coordinate geometry to two equivalent Si(10), four equivalent Si(1), and four equivalent Si(13) atoms. In the eleventh Dy site, Dy(11) is bonded in a 10-coordinate geometry to two equivalent Si(11), four equivalent Si(14), and four equivalent Si(2) atoms. In the twelfth Dy site, Dy(12) is bonded to two equivalent Si(12), two equivalent Si(16), four equivalent Si(15), and four equivalent Si(3) atoms to form a mixture of distorted face and edge-sharing DySi12 cuboctahedra. There are sixteen inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Dy(1), four equivalent Dy(10), one Si(13), and two equivalent Si(10) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Dy(2), four equivalent Dy(11), one Si(14), and two equivalent Si(11) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Dy(3), four equivalent Dy(12), one Si(15), and two equivalent Si(12) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to two equivalent Dy(4), four equivalent Dy(7), one Si(16), and two equivalent Si(7) atoms. In the fifth Si site, Si(5) is bonded in a 8-coordinate geometry to two equivalent Dy(5), four equivalent Dy(8), and two equivalent Si(8) atoms. In the sixth Si site, Si(6) is bonded in a 8-coordinate geometry to two equivalent Dy(6), four equivalent Dy(9), and two equivalent Si(9) atoms. In the seventh Si site, Si(7) is bonded in a 9-coordinate geometry to one Dy(1), two equivalent Dy(7), four equivalent Dy(4), and two equivalent Si(4) atoms. In the eighth Si site, Si(8) is bonded in a 9-coordinate geometry to one Dy(2), two equivalent Dy(8), four equivalent Dy(5), and two equivalent Si(5) atoms. In the ninth Si site, Si(9) is bonded in a 9-coordinate geometry to one Dy(3), two equivalent Dy(9), four equivalent Dy(6), and two equivalent Si(6) atoms. In the tenth Si site, Si(10) is bonded in a 9-coordinate geometry to one Dy(4), two equivalent Dy(10), four equivalent Dy(1), and two equivalent Si(1) atoms. In the eleventh Si site, Si(11) is bonded in a 9-coordinate geometry to one Dy(5), two equivalent Dy(11), four equivalent Dy(2), and two equivalent Si(2) atoms. In the twelfth Si site, Si(12) is bonded in a 9-coordinate geometry to one Dy(6), two equivalent Dy(12), four equivalent Dy(3), and two equivalent Si(3) atoms. In the thirteenth Si site, Si(13) is bonded in a 7-coordinate geometry to two equivalent Dy(8), four equivalent Dy(10), and one Si(1) atom. In the fourteenth Si site, Si(14) is bonded in a 7-coordinate geometry to two equivalent Dy(9), four equivalent Dy(11), and one Si(2) atom. In the fifteenth Si site, Si(15) is bonded in a 9-coordinate geometry to two equivalent Dy(7), four equivalent Dy(12), one Si(3), and two equivalent Si(16) atoms. In the sixteenth Si site, Si(16) is bonded in a 9-coordinate geometry to two equivalent Dy(12), four equivalent Dy(7), one Si(4), and two equivalent Si(15) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Dy3Si4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.878
_cell_length_b   4.148
_cell_length_c   36.409
_cell_angle_alpha   86.735
_cell_angle_beta   90.404
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   584.661
_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
  Dy  Dy0  1  0.253  0.900  0.200  1.0
  Dy  Dy1  1  0.252  0.234  0.533  1.0
  Dy  Dy2  1  0.249  0.568  0.865  1.0
  Dy  Dy3  1  0.751  0.432  0.136  1.0
  Dy  Dy4  1  0.750  0.766  0.468  1.0
  Dy  Dy5  1  0.750  0.100  0.800  1.0
  Dy  Dy6  1  0.251  0.477  0.047  1.0
  Dy  Dy7  1  0.245  0.810  0.381  1.0
  Dy  Dy8  1  0.246  0.143  0.714  1.0
  Dy  Dy9  1  0.767  0.857  0.287  1.0
  Dy  Dy10  1  0.766  0.190  0.620  1.0
  Dy  Dy11  1  0.749  0.523  0.954  1.0
  Si  Si12  1  0.260  0.371  0.259  1.0
  Si  Si13  1  0.260  0.704  0.592  1.0
  Si  Si14  1  0.251  0.040  0.920  1.0
  Si  Si15  1  0.749  0.960  0.080  1.0
  Si  Si16  1  0.747  0.296  0.407  1.0
  Si  Si17  1  0.747  0.630  0.740  1.0
  Si  Si18  1  0.250  0.940  0.120  1.0
  Si  Si19  1  0.250  0.276  0.449  1.0
  Si  Si20  1  0.250  0.609  0.781  1.0
  Si  Si21  1  0.753  0.391  0.218  1.0
  Si  Si22  1  0.752  0.725  0.551  1.0
  Si  Si23  1  0.750  0.060  0.880  1.0
  Si  Si24  1  0.304  0.338  0.323  1.0
  Si  Si25  1  0.307  0.672  0.656  1.0
  Si  Si26  1  0.249  0.008  0.983  1.0
  Si  Si27  1  0.751  0.992  0.017  1.0
[/CIF]
.