The crystal structure described by MgSi2(AgO)8 crystallizes in the tetragonal P-4 space group. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(1) atoms. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a distorted T-shaped geometry to one O(1) and two equivalent O(2) atoms. In the second Ag site, Ag(2) is bonded in a bent 150 degrees geometry to one O(1) and one O(2) atom. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to four equivalent O(2) atoms. In the second Si site, Si(2) is bonded in a tetrahedral geometry to four equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Mg(1), one Ag(1), one Ag(2), and one Si(2) atom. In the second O site, O(2) is bonded to one Ag(2), two equivalent Ag(1), and one Si(1) atom to form distorted corner-sharing OSiAg3 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgSi2(AgO)8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.107
_cell_length_b   7.712
_cell_length_c   7.712
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   303.726
_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  0.750  0.750  0.750  1.0
  Si  Si1  1  0.750  0.250  0.250  1.0
  Si  Si2  1  0.250  0.750  0.750  1.0
  Ag  Ag3  1  0.238  0.157  0.566  1.0
  Ag  Ag4  1  0.834  0.626  0.116  1.0
  Ag  Ag5  1  0.834  0.874  0.384  1.0
  Ag  Ag6  1  0.666  0.384  0.626  1.0
  Ag  Ag7  1  0.666  0.116  0.874  1.0
  Ag  Ag8  1  0.262  0.566  0.343  1.0
  Ag  Ag9  1  0.238  0.343  0.934  1.0
  Ag  Ag10  1  0.262  0.934  0.157  1.0
  O  O11  1  0.455  0.592  0.801  1.0
  O  O12  1  0.940  0.317  0.412  1.0
  O  O13  1  0.045  0.801  0.908  1.0
  O  O14  1  0.560  0.412  0.183  1.0
  O  O15  1  0.940  0.183  0.088  1.0
  O  O16  1  0.455  0.908  0.699  1.0
  O  O17  1  0.045  0.699  0.592  1.0
  O  O18  1  0.560  0.088  0.317  1.0
[/CIF]
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The crystal structure described by MgSi2(AgO)8 crystallizes in the tetragonal P-4 space group. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(1) atoms. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a distorted T-shaped geometry to one O(1) and two equivalent O(2) atoms. In the second Ag site, Ag(2) is bonded in a bent 150 degrees geometry to one O(1) and one O(2) atom. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to four equivalent O(2) atoms. In the second Si site, Si(2) is bonded in a tetrahedral geometry to four equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Mg(1), one Ag(1), one Ag(2), and one Si(2) atom. In the second O site, O(2) is bonded to one Ag(2), two equivalent Ag(1), and one Si(1) atom to form distorted corner-sharing OSiAg3 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgSi2(AgO)8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.107
_cell_length_b   7.712
_cell_length_c   7.712
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   303.726
_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  0.750  0.750  0.750  1.0
  Si  Si1  1  0.750  0.250  0.250  1.0
  Si  Si2  1  0.250  0.750  0.750  1.0
  Ag  Ag3  1  0.238  0.157  0.566  1.0
  Ag  Ag4  1  0.834  0.626  0.116  1.0
  Ag  Ag5  1  0.834  0.874  0.384  1.0
  Ag  Ag6  1  0.666  0.384  0.626  1.0
  Ag  Ag7  1  0.666  0.116  0.874  1.0
  Ag  Ag8  1  0.262  0.566  0.343  1.0
  Ag  Ag9  1  0.238  0.343  0.934  1.0
  Ag  Ag10  1  0.262  0.934  0.157  1.0
  O  O11  1  0.455  0.592  0.801  1.0
  O  O12  1  0.940  0.317  0.412  1.0
  O  O13  1  0.045  0.801  0.908  1.0
  O  O14  1  0.560  0.412  0.183  1.0
  O  O15  1  0.940  0.183  0.088  1.0
  O  O16  1  0.455  0.908  0.699  1.0
  O  O17  1  0.045  0.699  0.592  1.0
  O  O18  1  0.560  0.088  0.317  1.0
[/CIF]
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