The structure described by MgAg4 crystallizes in the trigonal R-3m space group. Mg(1) is bonded to six equivalent Ag(1) atoms to form distorted MgAg6 cuboctahedra that share corners with six equivalent Ag(2)Ag12 cuboctahedra, edges with six equivalent Mg(1)Ag6 cuboctahedra, and edges with six equivalent Ag(2)Ag12 cuboctahedra. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to three equivalent Mg(1) and three equivalent Ag(2) atoms to form distorted AgMg3Ag3 cuboctahedra that share corners with three equivalent Ag(1)Mg3Ag3 cuboctahedra, corners with nine equivalent Ag(2)Ag12 cuboctahedra, edges with nine equivalent Ag(2)Ag12 cuboctahedra, and edges with nine equivalent Ag(1)Mg3Ag3 cuboctahedra. In the second Ag site, Ag(2) is bonded to three equivalent Ag(1) and nine equivalent Ag(2) atoms to form AgAg12 cuboctahedra that share corners with three equivalent Mg(1)Ag6 cuboctahedra, corners with six equivalent Ag(2)Ag12 cuboctahedra, corners with nine equivalent Ag(1)Mg3Ag3 cuboctahedra, edges with three equivalent Mg(1)Ag6 cuboctahedra, edges with nine equivalent Ag(1)Mg3Ag3 cuboctahedra, edges with twelve equivalent Ag(2)Ag12 cuboctahedra, and faces with twelve equivalent Ag(2)Ag12 cuboctahedra. is represented by the CIF card [CIF]
data_MgAg4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.777
_cell_length_b   11.777
_cell_length_c   11.777
_cell_angle_alpha   14.710
_cell_angle_beta   14.710
_cell_angle_gamma   14.710
_symmetry_Int_Tables_number   1
_cell_volume   91.706
_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
  Mg  Mg0  1  0.000  0.000  0.000  1.0
  Ag  Ag1  1  0.601  0.601  0.601  1.0
  Ag  Ag2  1  0.200  0.200  0.200  1.0
  Ag  Ag3  1  0.800  0.800  0.800  1.0
  Ag  Ag4  1  0.399  0.399  0.399  1.0
[/CIF]
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The structure described by MgAg4 crystallizes in the trigonal R-3m space group. Mg(1) is bonded to six equivalent Ag(1) atoms to form distorted MgAg6 cuboctahedra that share corners with six equivalent Ag(2)Ag12 cuboctahedra, edges with six equivalent Mg(1)Ag6 cuboctahedra, and edges with six equivalent Ag(2)Ag12 cuboctahedra. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to three equivalent Mg(1) and three equivalent Ag(2) atoms to form distorted AgMg3Ag3 cuboctahedra that share corners with three equivalent Ag(1)Mg3Ag3 cuboctahedra, corners with nine equivalent Ag(2)Ag12 cuboctahedra, edges with nine equivalent Ag(2)Ag12 cuboctahedra, and edges with nine equivalent Ag(1)Mg3Ag3 cuboctahedra. In the second Ag site, Ag(2) is bonded to three equivalent Ag(1) and nine equivalent Ag(2) atoms to form AgAg12 cuboctahedra that share corners with three equivalent Mg(1)Ag6 cuboctahedra, corners with six equivalent Ag(2)Ag12 cuboctahedra, corners with nine equivalent Ag(1)Mg3Ag3 cuboctahedra, edges with three equivalent Mg(1)Ag6 cuboctahedra, edges with nine equivalent Ag(1)Mg3Ag3 cuboctahedra, edges with twelve equivalent Ag(2)Ag12 cuboctahedra, and faces with twelve equivalent Ag(2)Ag12 cuboctahedra. is represented by the CIF card [CIF]
data_MgAg4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.777
_cell_length_b   11.777
_cell_length_c   11.777
_cell_angle_alpha   14.710
_cell_angle_beta   14.710
_cell_angle_gamma   14.710
_symmetry_Int_Tables_number   1
_cell_volume   91.706
_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
  Mg  Mg0  1  0.000  0.000  0.000  1.0
  Ag  Ag1  1  0.601  0.601  0.601  1.0
  Ag  Ag2  1  0.200  0.200  0.200  1.0
  Ag  Ag3  1  0.800  0.800  0.800  1.0
  Ag  Ag4  1  0.399  0.399  0.399  1.0
[/CIF]
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