data_EuGd2Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.25
_cell_length_b   5.25
_cell_length_c   5.25
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   EuGd2Si
_chemical_formula_sum   'Eu1 Gd2 Si1'
_cell_volume   102.33
_cell_formula_units_Z   1
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
  Eu  Eu0  1  0.71  0.71  0.71  1.0
  Gd  Gd1  1  0.86  0.86  0.86  1.0
  Gd  Gd2  1  0.57  0.57  0.57  1.0
  Si  Si3  1  0.0  0.0  0.0  1.0

data_EuGd2Si
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.25
_cell_length_b   5.25
_cell_length_c   12.86
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   EuGd2Si
_chemical_formula_sum   'Eu3 Gd6 Si3'
_cell_volume   307.0
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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  3  0.0  0.0  0.14  1.0
  Eu  Eu1  3  0.0  0.0  0.29  1.0
  Gd  Gd2  3  0.0  0.0  0.43  1.0
  Si  Si3  3  0.0  0.0  0.0  1.0

Eu Gd Gd Si
Gd2EuSi crystallizes in the trigonal R3m space group. There are two inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a distorted single-bond geometry to one Eu(1) and one Si(1) atom. The Gd(1)-Eu(1) bond length is 1.85 Å. The Gd(1)-Si(1) bond length is 1.85 Å. In the second Gd site, Gd(2) is bonded in a distorted single-bond geometry to one Eu(1) atom. The Gd(2)-Eu(1) bond length is 1.85 Å. Eu(1) is bonded to one Gd(1), one Gd(2), and three equivalent Si(1) atoms to form distorted corner-sharing EuGd2Si3 trigonal bipyramids. All Eu(1)-Si(1) bond lengths are 3.09 Å. Si(1) is bonded in a distorted single-bond geometry to one Gd(1) and three equivalent Eu(1) atoms.