The material described by Mg(BiO2)4 crystallizes in the monoclinic Cm space group. Mg(1) is bonded to one O(2), one O(4), two equivalent O(6), and two equivalent O(7) atoms to form distorted MgO6 octahedra that share  a cornercorner with one Bi(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles are 35°. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(2), one O(7), two equivalent O(4), and two equivalent O(5) atoms to form BiO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles are 35°. In the second Bi site, Bi(2) is bonded in a 3-coordinate geometry to one O(8), two equivalent O(3), and two equivalent O(6) atoms. In the third Bi site, Bi(3) is bonded in a 6-coordinate geometry to one O(1), one O(6), two equivalent O(2), and two equivalent O(8) atoms. In the fourth Bi site, Bi(4) is bonded in a distorted see-saw-like geometry to one O(3), one O(5), and two equivalent O(1) atoms. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Bi(3) and two equivalent Bi(4) atoms. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Bi(1), and two equivalent Bi(3) atoms. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to one Bi(4) and two equivalent Bi(2) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mg(1) and two equivalent Bi(1) atoms. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one Bi(4) and two equivalent Bi(1) atoms. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to two equivalent Mg(1), one Bi(3), and two equivalent Bi(2) atoms. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to two equivalent Mg(1) and one Bi(1) atom. In the eighth O site, O(8) is bonded in a trigonal non-coplanar geometry to one Bi(2) and two equivalent Bi(3) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg(BiO2)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.003
_cell_length_b   7.003
_cell_length_c   10.607
_cell_angle_alpha   63.172
_cell_angle_beta   63.172
_cell_angle_gamma   28.389
_symmetry_Int_Tables_number   1
_cell_volume   218.911
_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  0.696  0.696  0.797  1.0
  Bi  Bi1  1  0.372  0.372  0.872  1.0
  Bi  Bi2  1  0.883  0.883  0.462  1.0
  Bi  Bi3  1  0.123  0.123  0.563  1.0
  Bi  Bi4  1  0.630  0.630  0.177  1.0
  O  O5  1  0.121  0.121  0.309  1.0
  O  O6  1  0.549  0.549  0.767  1.0
  O  O7  1  0.443  0.443  0.310  1.0
  O  O8  1  0.874  0.874  0.735  1.0
  O  O9  1  0.845  0.845  0.015  1.0
  O  O10  1  0.242  0.242  0.647  1.0
  O  O11  1  0.196  0.196  0.932  1.0
  O  O12  1  0.732  0.732  0.439  1.0
[/CIF]
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The material described by Mg(BiO2)4 crystallizes in the monoclinic Cm space group. Mg(1) is bonded to one O(2), one O(4), two equivalent O(6), and two equivalent O(7) atoms to form distorted MgO6 octahedra that share  a cornercorner with one Bi(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles are 35°. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(2), one O(7), two equivalent O(4), and two equivalent O(5) atoms to form BiO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles are 35°. In the second Bi site, Bi(2) is bonded in a 3-coordinate geometry to one O(8), two equivalent O(3), and two equivalent O(6) atoms. In the third Bi site, Bi(3) is bonded in a 6-coordinate geometry to one O(1), one O(6), two equivalent O(2), and two equivalent O(8) atoms. In the fourth Bi site, Bi(4) is bonded in a distorted see-saw-like geometry to one O(3), one O(5), and two equivalent O(1) atoms. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Bi(3) and two equivalent Bi(4) atoms. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Bi(1), and two equivalent Bi(3) atoms. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to one Bi(4) and two equivalent Bi(2) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mg(1) and two equivalent Bi(1) atoms. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one Bi(4) and two equivalent Bi(1) atoms. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to two equivalent Mg(1), one Bi(3), and two equivalent Bi(2) atoms. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to two equivalent Mg(1) and one Bi(1) atom. In the eighth O site, O(8) is bonded in a trigonal non-coplanar geometry to one Bi(2) and two equivalent Bi(3) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg(BiO2)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.003
_cell_length_b   7.003
_cell_length_c   10.607
_cell_angle_alpha   63.172
_cell_angle_beta   63.172
_cell_angle_gamma   28.389
_symmetry_Int_Tables_number   1
_cell_volume   218.911
_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  0.696  0.696  0.797  1.0
  Bi  Bi1  1  0.372  0.372  0.872  1.0
  Bi  Bi2  1  0.883  0.883  0.462  1.0
  Bi  Bi3  1  0.123  0.123  0.563  1.0
  Bi  Bi4  1  0.630  0.630  0.177  1.0
  O  O5  1  0.121  0.121  0.309  1.0
  O  O6  1  0.549  0.549  0.767  1.0
  O  O7  1  0.443  0.443  0.310  1.0
  O  O8  1  0.874  0.874  0.735  1.0
  O  O9  1  0.845  0.845  0.015  1.0
  O  O10  1  0.242  0.242  0.647  1.0
  O  O11  1  0.196  0.196  0.932  1.0
  O  O12  1  0.732  0.732  0.439  1.0
[/CIF]
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