The structure described by Mg(BiO2)4 crystallizes in the monoclinic Cm space group. Mg(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Bi(1)O6 octahedra, and edges with two equivalent Bi(4)O6 octahedra. 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 distorted BiO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Bi(1)O6 octahedra, and edges with two equivalent Bi(4)O6 octahedra. In the second Bi site, Bi(2) is bonded in a 3-coordinate geometry to one O(4), one O(8), and two equivalent O(6) atoms. In the third Bi site, Bi(3) is bonded in a 4-coordinate geometry to one O(1), one O(6), and two equivalent O(8) atoms. In the fourth Bi site, Bi(4) is bonded to one O(3), one O(5), two equivalent O(1), and two equivalent O(7) atoms to form BiO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Bi(1)O6 octahedra, and edges with two equivalent Bi(4)O6 octahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Bi(3), and two equivalent Bi(4) atoms to form corner-sharing OMgBi3 trigonal pyramids. In the second O site, O(2) is bonded in a distorted T-shaped geometry to two equivalent Mg(1) and one Bi(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Mg(1) and one Bi(4) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Bi(2), 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 trigonal non-coplanar geometry to one Bi(3) and two equivalent Bi(2) atoms. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Bi(1) and two equivalent Bi(4) atoms. In the eighth O site, O(8) is bonded in a distorted 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   3.477
_cell_length_b   8.776
_cell_length_c   9.551
_cell_angle_alpha   78.498
_cell_angle_beta   79.534
_cell_angle_gamma   78.579
_symmetry_Int_Tables_number   1
_cell_volume   276.855
_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  0.981  0.492  0.513  1.0
  Bi  Bi1  1  0.647  0.188  0.488  1.0
  Bi  Bi2  1  0.128  0.540  0.173  1.0
  Bi  Bi3  1  0.822  0.483  0.843  1.0
  Bi  Bi4  1  0.328  0.814  0.500  1.0
  O  O5  1  0.831  0.679  0.629  1.0
  O  O6  1  0.485  0.373  0.625  1.0
  O  O7  1  0.479  0.618  0.393  1.0
  O  O8  1  0.129  0.348  0.363  1.0
  O  O9  1  0.177  0.018  0.600  1.0
  O  O10  1  0.725  0.422  0.096  1.0
  O  O11  1  0.832  0.921  0.383  1.0
  O  O12  1  0.228  0.608  0.905  1.0
[/CIF]
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The structure described by Mg(BiO2)4 crystallizes in the monoclinic Cm space group. Mg(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Bi(1)O6 octahedra, and edges with two equivalent Bi(4)O6 octahedra. 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 distorted BiO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Bi(1)O6 octahedra, and edges with two equivalent Bi(4)O6 octahedra. In the second Bi site, Bi(2) is bonded in a 3-coordinate geometry to one O(4), one O(8), and two equivalent O(6) atoms. In the third Bi site, Bi(3) is bonded in a 4-coordinate geometry to one O(1), one O(6), and two equivalent O(8) atoms. In the fourth Bi site, Bi(4) is bonded to one O(3), one O(5), two equivalent O(1), and two equivalent O(7) atoms to form BiO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Bi(1)O6 octahedra, and edges with two equivalent Bi(4)O6 octahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Bi(3), and two equivalent Bi(4) atoms to form corner-sharing OMgBi3 trigonal pyramids. In the second O site, O(2) is bonded in a distorted T-shaped geometry to two equivalent Mg(1) and one Bi(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Mg(1) and one Bi(4) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Bi(2), 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 trigonal non-coplanar geometry to one Bi(3) and two equivalent Bi(2) atoms. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Bi(1) and two equivalent Bi(4) atoms. In the eighth O site, O(8) is bonded in a distorted 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   3.477
_cell_length_b   8.776
_cell_length_c   9.551
_cell_angle_alpha   78.498
_cell_angle_beta   79.534
_cell_angle_gamma   78.579
_symmetry_Int_Tables_number   1
_cell_volume   276.855
_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  0.981  0.492  0.513  1.0
  Bi  Bi1  1  0.647  0.188  0.488  1.0
  Bi  Bi2  1  0.128  0.540  0.173  1.0
  Bi  Bi3  1  0.822  0.483  0.843  1.0
  Bi  Bi4  1  0.328  0.814  0.500  1.0
  O  O5  1  0.831  0.679  0.629  1.0
  O  O6  1  0.485  0.373  0.625  1.0
  O  O7  1  0.479  0.618  0.393  1.0
  O  O8  1  0.129  0.348  0.363  1.0
  O  O9  1  0.177  0.018  0.600  1.0
  O  O10  1  0.725  0.422  0.096  1.0
  O  O11  1  0.832  0.921  0.383  1.0
  O  O12  1  0.228  0.608  0.905  1.0
[/CIF]
.