The crystal structure described by MgCe2Si4 crystallizes in the tetragonal I4_1/amd space group. Mg(1) is bonded in a distorted square co-planar geometry to four equivalent Ce(1) and four equivalent Si(1) atoms. Ce(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Ce(1), two equivalent Si(1), and four equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(2) is bonded in a 8-coordinate geometry to four equivalent Ce(1), one Si(1), and three equivalent Si(2) atoms. In the second Si site, Si(1) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Ce(1), one Si(1), and one Si(2) atom. is represented by the CIF file [CIF]
data_Ce2MgSi4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.951
_cell_length_b   5.951
_cell_length_c   17.793
_cell_angle_alpha   99.627
_cell_angle_beta   99.627
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   612.265
_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
  Ce  Ce0  1  0.797  0.044  0.594  1.0
  Ce  Ce1  1  0.797  0.551  0.594  1.0
  Ce  Ce2  1  0.801  0.547  0.094  1.0
  Ce  Ce3  1  0.453  0.199  0.906  1.0
  Ce  Ce4  1  0.453  0.707  0.906  1.0
  Ce  Ce5  1  0.294  0.547  0.094  1.0
  Ce  Ce6  1  0.449  0.203  0.406  1.0
  Ce  Ce7  1  0.957  0.203  0.406  1.0
  Mg  Mg8  1  0.125  0.375  0.250  1.0
  Mg  Mg9  1  0.125  0.875  0.250  1.0
  Mg  Mg10  1  0.125  0.875  0.750  1.0
  Mg  Mg11  1  0.625  0.875  0.750  1.0
  Si  Si12  1  0.332  0.533  0.664  1.0
  Si  Si13  1  0.332  0.130  0.664  1.0
  Si  Si14  1  0.380  0.082  0.164  1.0
  Si  Si15  1  0.918  0.620  0.836  1.0
  Si  Si16  1  0.918  0.217  0.836  1.0
  Si  Si17  1  0.783  0.082  0.164  1.0
  Si  Si18  1  0.870  0.668  0.336  1.0
  Si  Si19  1  0.467  0.668  0.336  1.0
  Si  Si20  1  0.264  0.493  0.528  1.0
  Si  Si21  1  0.264  0.035  0.528  1.0
  Si  Si22  1  0.285  0.014  0.028  1.0
  Si  Si23  1  0.986  0.715  0.972  1.0
  Si  Si24  1  0.986  0.258  0.972  1.0
  Si  Si25  1  0.743  0.014  0.028  1.0
  Si  Si26  1  0.965  0.736  0.472  1.0
  Si  Si27  1  0.508  0.736  0.472  1.0
[/CIF]
.
The crystal structure described by MgCe2Si4 crystallizes in the tetragonal I4_1/amd space group. Mg(1) is bonded in a distorted square co-planar geometry to four equivalent Ce(1) and four equivalent Si(1) atoms. Ce(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Ce(1), two equivalent Si(1), and four equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(2) is bonded in a 8-coordinate geometry to four equivalent Ce(1), one Si(1), and three equivalent Si(2) atoms. In the second Si site, Si(1) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Ce(1), one Si(1), and one Si(2) atom. is represented by the CIF file [CIF]
data_Ce2MgSi4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.951
_cell_length_b   5.951
_cell_length_c   17.793
_cell_angle_alpha   99.627
_cell_angle_beta   99.627
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   612.265
_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
  Ce  Ce0  1  0.797  0.044  0.594  1.0
  Ce  Ce1  1  0.797  0.551  0.594  1.0
  Ce  Ce2  1  0.801  0.547  0.094  1.0
  Ce  Ce3  1  0.453  0.199  0.906  1.0
  Ce  Ce4  1  0.453  0.707  0.906  1.0
  Ce  Ce5  1  0.294  0.547  0.094  1.0
  Ce  Ce6  1  0.449  0.203  0.406  1.0
  Ce  Ce7  1  0.957  0.203  0.406  1.0
  Mg  Mg8  1  0.125  0.375  0.250  1.0
  Mg  Mg9  1  0.125  0.875  0.250  1.0
  Mg  Mg10  1  0.125  0.875  0.750  1.0
  Mg  Mg11  1  0.625  0.875  0.750  1.0
  Si  Si12  1  0.332  0.533  0.664  1.0
  Si  Si13  1  0.332  0.130  0.664  1.0
  Si  Si14  1  0.380  0.082  0.164  1.0
  Si  Si15  1  0.918  0.620  0.836  1.0
  Si  Si16  1  0.918  0.217  0.836  1.0
  Si  Si17  1  0.783  0.082  0.164  1.0
  Si  Si18  1  0.870  0.668  0.336  1.0
  Si  Si19  1  0.467  0.668  0.336  1.0
  Si  Si20  1  0.264  0.493  0.528  1.0
  Si  Si21  1  0.264  0.035  0.528  1.0
  Si  Si22  1  0.285  0.014  0.028  1.0
  Si  Si23  1  0.986  0.715  0.972  1.0
  Si  Si24  1  0.986  0.258  0.972  1.0
  Si  Si25  1  0.743  0.014  0.028  1.0
  Si  Si26  1  0.965  0.736  0.472  1.0
  Si  Si27  1  0.508  0.736  0.472  1.0
[/CIF]
.