data_FeAg2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.32
_cell_length_b   6.32
_cell_length_c   2.83
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   FeAg2
_chemical_formula_sum   'Fe2 Ag4'
_cell_volume   113.25
_cell_formula_units_Z   2
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
  Fe  Fe4  1  0.0  0.0  0.0  1.0
  Fe  Fe5  1  0.16  0.16  0.42  1.0
  Ag  Ag0  1  0.7  0.7  0.0  1.0
  Ag  Ag1  1  0.62  0.62  0.0  1.0
  Ag  Ag2  1  0.86  0.46  0.42  1.0
  Ag  Ag3  1  0.46  0.86  0.42  1.0

data_FeAg2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   8.94
_cell_length_b   8.94
_cell_length_c   2.83
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   FeAg2
_chemical_formula_sum   'Fe4 Ag8'
_cell_volume   226.5
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  Fe  Fe0  2  0.0  0.0  0.0  1.0
  Fe  Fe1  2  0.16  0.0  0.42  1.0
  Ag  Ag2  4  0.16  0.3  0.42  1.0
  Ag  Ag3  2  0.12  0.5  -0.0  1.0
  Ag  Ag4  2  0.2  0.5  -0.0  1.0

Fe Fe Ag Ag Ag Ag
FeAg2 crystallizes in the monoclinic Cm space group. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 3-coordinate geometry to two equivalent Fe(2), one Ag(1), and four equivalent Ag(3) atoms. There is one shorter (1.86 Å) and one longer (2.19 Å) Fe(1)-Fe(2) bond length. The Fe(1)-Ag(1) bond length is 2.67 Å. There are two shorter (3.26 Å) and two longer (3.45 Å) Fe(1)-Ag(3) bond lengths. In the second Fe site, Fe(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Fe(1) and two equivalent Ag(3) atoms. Both Fe(2)-Ag(3) bond lengths are 2.67 Å. There are three inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a single-bond geometry to one Fe(1), one Ag(2), and four equivalent Ag(3) atoms. The Ag(1)-Ag(2) bond length is 0.72 Å. There are two shorter (2.18 Å) and two longer (2.47 Å) Ag(1)-Ag(3) bond lengths. In the second Ag site, Ag(2) is bonded in a single-bond geometry to one Ag(1) and four equivalent Ag(3) atoms. There are two shorter (2.18 Å) and two longer (2.47 Å) Ag(2)-Ag(3) bond lengths. In the third Ag site, Ag(3) is bonded in a 9-coordinate geometry to one Fe(2), two equivalent Fe(1), two equivalent Ag(1), two equivalent Ag(2), and two equivalent Ag(3) atoms. Both Ag(3)-Ag(3) bond lengths are 2.83 Å.