The structure described by MgNi2(BiO3)2 crystallizes in the trigonal R3 space group. Mg(1) is bonded in a trigonal planar geometry to three equivalent O(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted trigonal planar geometry to three equivalent O(2) atoms. In the second Ni site, Ni(2) is bonded in an octahedral geometry to three equivalent O(1) and three equivalent O(2) atoms. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(2) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Ni(2), one Bi(1), and one Bi(2) atom to form distorted OMgNiBi2 trigonal pyramids that share corners with four equivalent O(1)MgNiBi2 trigonal pyramids, corners with seven equivalent O(2)Ni2Bi2 trigonal pyramids,  an edgeedge with one O(2)Ni2Bi2 trigonal pyramid, and edges with two equivalent O(1)MgNiBi2 trigonal pyramids. In the second O site, O(2) is bonded to one Ni(1), one Ni(2), one Bi(1), and one Bi(2) atom to form distorted ONi2Bi2 trigonal pyramids that share corners with four equivalent O(2)Ni2Bi2 trigonal pyramids, corners with seven equivalent O(1)MgNiBi2 trigonal pyramids,  an edgeedge with one O(1)MgNiBi2 trigonal pyramid, and edges with two equivalent O(2)Ni2Bi2 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgNi2(BiO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.207
_cell_length_b   6.203
_cell_length_c   6.202
_cell_angle_alpha   55.675
_cell_angle_beta   55.668
_cell_angle_gamma   55.642
_symmetry_Int_Tables_number   1
_cell_volume   151.839
_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  0.914  0.915  0.913  1.0
  Ni  Ni1  1  0.096  0.096  0.096  1.0
  Ni  Ni2  1  0.495  0.495  0.494  1.0
  Bi  Bi3  1  0.301  0.301  0.300  1.0
  Bi  Bi4  1  0.686  0.686  0.686  1.0
  O  O5  1  0.284  0.835  0.628  1.0
  O  O6  1  0.835  0.629  0.283  1.0
  O  O7  1  0.629  0.284  0.834  1.0
  O  O8  1  0.159  0.346  0.717  1.0
  O  O9  1  0.717  0.159  0.345  1.0
  O  O10  1  0.346  0.718  0.159  1.0
[/CIF]
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The structure described by MgNi2(BiO3)2 crystallizes in the trigonal R3 space group. Mg(1) is bonded in a trigonal planar geometry to three equivalent O(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted trigonal planar geometry to three equivalent O(2) atoms. In the second Ni site, Ni(2) is bonded in an octahedral geometry to three equivalent O(1) and three equivalent O(2) atoms. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(2) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Ni(2), one Bi(1), and one Bi(2) atom to form distorted OMgNiBi2 trigonal pyramids that share corners with four equivalent O(1)MgNiBi2 trigonal pyramids, corners with seven equivalent O(2)Ni2Bi2 trigonal pyramids,  an edgeedge with one O(2)Ni2Bi2 trigonal pyramid, and edges with two equivalent O(1)MgNiBi2 trigonal pyramids. In the second O site, O(2) is bonded to one Ni(1), one Ni(2), one Bi(1), and one Bi(2) atom to form distorted ONi2Bi2 trigonal pyramids that share corners with four equivalent O(2)Ni2Bi2 trigonal pyramids, corners with seven equivalent O(1)MgNiBi2 trigonal pyramids,  an edgeedge with one O(1)MgNiBi2 trigonal pyramid, and edges with two equivalent O(2)Ni2Bi2 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgNi2(BiO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.207
_cell_length_b   6.203
_cell_length_c   6.202
_cell_angle_alpha   55.675
_cell_angle_beta   55.668
_cell_angle_gamma   55.642
_symmetry_Int_Tables_number   1
_cell_volume   151.839
_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  0.914  0.915  0.913  1.0
  Ni  Ni1  1  0.096  0.096  0.096  1.0
  Ni  Ni2  1  0.495  0.495  0.494  1.0
  Bi  Bi3  1  0.301  0.301  0.300  1.0
  Bi  Bi4  1  0.686  0.686  0.686  1.0
  O  O5  1  0.284  0.835  0.628  1.0
  O  O6  1  0.835  0.629  0.283  1.0
  O  O7  1  0.629  0.284  0.834  1.0
  O  O8  1  0.159  0.346  0.717  1.0
  O  O9  1  0.717  0.159  0.345  1.0
  O  O10  1  0.346  0.718  0.159  1.0
[/CIF]
.