The crystal structure described by Gd3Ag2Al7 is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the trigonal R-3m space group. There are two inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 12-coordinate geometry to three equivalent Al(2) and nine equivalent Al(1) atoms. In the second Gd site, Gd(2) is bonded in a distorted hexagonal planar geometry to six equivalent Ag(1) and twelve equivalent Al(1) atoms. Ag(1) is bonded in a 9-coordinate geometry to three equivalent Gd(2) and six equivalent Al(1) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 12-coordinate geometry to two equivalent Gd(2), three equivalent Gd(1), two equivalent Ag(1), one Al(2), and four equivalent Al(1) atoms. In the second Al site, Al(2) is bonded to six equivalent Gd(1) and six equivalent Al(1) atoms to form edge-sharing AlGd6Al6 cuboctahedra. is represented by the CIF file [CIF]
data_Gd3Al7Ag2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.368
_cell_length_b   9.368
_cell_length_c   9.368
_cell_angle_alpha   34.467
_cell_angle_beta   34.467
_cell_angle_gamma   34.467
_symmetry_Int_Tables_number   1
_cell_volume   234.891
_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
  Gd  Gd0  1  0.143  0.143  0.143  1.0
  Gd  Gd1  1  0.857  0.857  0.857  1.0
  Gd  Gd2  1  0.000  0.000  0.000  1.0
  Al  Al3  1  0.586  0.586  0.076  1.0
  Al  Al4  1  0.414  0.924  0.414  1.0
  Al  Al5  1  0.586  0.076  0.586  1.0
  Al  Al6  1  0.076  0.586  0.586  1.0
  Al  Al7  1  0.414  0.414  0.924  1.0
  Al  Al8  1  0.500  0.500  0.500  1.0
  Al  Al9  1  0.924  0.414  0.414  1.0
  Ag  Ag10  1  0.336  0.336  0.336  1.0
  Ag  Ag11  1  0.664  0.664  0.664  1.0
[/CIF]
.
The crystal structure described by Gd3Ag2Al7 is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the trigonal R-3m space group. There are two inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 12-coordinate geometry to three equivalent Al(2) and nine equivalent Al(1) atoms. In the second Gd site, Gd(2) is bonded in a distorted hexagonal planar geometry to six equivalent Ag(1) and twelve equivalent Al(1) atoms. Ag(1) is bonded in a 9-coordinate geometry to three equivalent Gd(2) and six equivalent Al(1) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 12-coordinate geometry to two equivalent Gd(2), three equivalent Gd(1), two equivalent Ag(1), one Al(2), and four equivalent Al(1) atoms. In the second Al site, Al(2) is bonded to six equivalent Gd(1) and six equivalent Al(1) atoms to form edge-sharing AlGd6Al6 cuboctahedra. is represented by the CIF file [CIF]
data_Gd3Al7Ag2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.368
_cell_length_b   9.368
_cell_length_c   9.368
_cell_angle_alpha   34.467
_cell_angle_beta   34.467
_cell_angle_gamma   34.467
_symmetry_Int_Tables_number   1
_cell_volume   234.891
_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
  Gd  Gd0  1  0.143  0.143  0.143  1.0
  Gd  Gd1  1  0.857  0.857  0.857  1.0
  Gd  Gd2  1  0.000  0.000  0.000  1.0
  Al  Al3  1  0.586  0.586  0.076  1.0
  Al  Al4  1  0.414  0.924  0.414  1.0
  Al  Al5  1  0.586  0.076  0.586  1.0
  Al  Al6  1  0.076  0.586  0.586  1.0
  Al  Al7  1  0.414  0.414  0.924  1.0
  Al  Al8  1  0.500  0.500  0.500  1.0
  Al  Al9  1  0.924  0.414  0.414  1.0
  Ag  Ag10  1  0.336  0.336  0.336  1.0
  Ag  Ag11  1  0.664  0.664  0.664  1.0
[/CIF]
.