The structure described by MgAg2(CO3)2 crystallizes in the trigonal R3 space group. Mg(1) is bonded in a distorted trigonal planar geometry to one Ag(1) and three equivalent O(1) atoms. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to one Mg(1) and three equivalent O(2) atoms to form distorted corner-sharing AgMgO3 trigonal pyramids. The corner-sharing octahedral tilt angles are 87°. In the second Ag site, Ag(2) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form corner-sharing AgO6 octahedra. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to three equivalent O(1) atoms. In the second C site, C(2) is bonded in a trigonal planar geometry to three equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mg(1), one Ag(2), and one C(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ag(1), one Ag(2), and one C(2) atom. is represented by the CIF file [CIF]
data_MgAg2(CO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.019
_cell_length_b   7.019
_cell_length_c   7.019
_cell_angle_alpha   43.909
_cell_angle_beta   43.909
_cell_angle_gamma   43.909
_symmetry_Int_Tables_number   1
_cell_volume   151.064
_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  0.924  0.924  0.924  1.0
  Ag  Ag1  1  0.071  0.071  0.071  1.0
  Ag  Ag2  1  0.486  0.486  0.486  1.0
  C  C3  1  0.237  0.237  0.237  1.0
  C  C4  1  0.735  0.735  0.735  1.0
  O  O5  1  0.204  0.006  0.498  1.0
  O  O6  1  0.005  0.520  0.679  1.0
  O  O7  1  0.520  0.679  0.005  1.0
  O  O8  1  0.498  0.204  0.006  1.0
  O  O9  1  0.006  0.498  0.204  1.0
  O  O10  1  0.679  0.005  0.520  1.0
[/CIF]
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The structure described by MgAg2(CO3)2 crystallizes in the trigonal R3 space group. Mg(1) is bonded in a distorted trigonal planar geometry to one Ag(1) and three equivalent O(1) atoms. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to one Mg(1) and three equivalent O(2) atoms to form distorted corner-sharing AgMgO3 trigonal pyramids. The corner-sharing octahedral tilt angles are 87°. In the second Ag site, Ag(2) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form corner-sharing AgO6 octahedra. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to three equivalent O(1) atoms. In the second C site, C(2) is bonded in a trigonal planar geometry to three equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mg(1), one Ag(2), and one C(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ag(1), one Ag(2), and one C(2) atom. is represented by the CIF file [CIF]
data_MgAg2(CO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.019
_cell_length_b   7.019
_cell_length_c   7.019
_cell_angle_alpha   43.909
_cell_angle_beta   43.909
_cell_angle_gamma   43.909
_symmetry_Int_Tables_number   1
_cell_volume   151.064
_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  0.924  0.924  0.924  1.0
  Ag  Ag1  1  0.071  0.071  0.071  1.0
  Ag  Ag2  1  0.486  0.486  0.486  1.0
  C  C3  1  0.237  0.237  0.237  1.0
  C  C4  1  0.735  0.735  0.735  1.0
  O  O5  1  0.204  0.006  0.498  1.0
  O  O6  1  0.005  0.520  0.679  1.0
  O  O7  1  0.520  0.679  0.005  1.0
  O  O8  1  0.498  0.204  0.006  1.0
  O  O9  1  0.006  0.498  0.204  1.0
  O  O10  1  0.679  0.005  0.520  1.0
[/CIF]
.