The material described by Mn2Bi3O7 crystallizes in the monoclinic Cm space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form distorted corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 9-30°. In the second Mn site, Mn(2) is bonded to one O(2), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 14-30°. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), and two equivalent O(7) atoms. In the second Bi site, Bi(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), and two equivalent O(8) atoms. In the third Bi site, Bi(3) is bonded in a 7-coordinate geometry to one O(3), one O(5), one O(6), one O(7), one O(8), and two equivalent O(4) atoms. In the fourth Bi site, Bi(4) is bonded in a 5-coordinate geometry to one O(4), one O(5), one O(6), and two equivalent O(3) atoms. There are eight inequivalent O sites. In the first O site, O(8) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), one Bi(2), and one Bi(3) atom. In the second O site, O(1) is bonded in a rectangular see-saw-like geometry to two equivalent Mn(1), one Bi(1), and one Bi(2) atom. In the third O site, O(2) is bonded to two equivalent Mn(2), one Bi(1), and one Bi(2) atom to form corner-sharing OMn2Bi2 trigonal pyramids. In the fourth O site, O(3) is bonded to one Mn(1), one Bi(3), and two equivalent Bi(4) atoms to form distorted corner-sharing OMnBi3 trigonal pyramids. In the fifth O site, O(4) is bonded to one Mn(2), one Bi(4), and two equivalent Bi(3) atoms to form distorted OMnBi3 tetrahedra that share corners with two equivalent O(4)MnBi3 tetrahedra,  a cornercorner with one O(2)Mn2Bi2 trigonal pyramid, and corners with four equivalent O(3)MnBi3 trigonal pyramids. In the sixth O site, O(5) is bonded in a distorted see-saw-like geometry to one Mn(1), one Mn(2), one Bi(3), and one Bi(4) atom. In the seventh O site, O(6) is bonded in a distorted see-saw-like geometry to one Mn(1), one Mn(2), one Bi(3), and one Bi(4) atom. In the eighth O site, O(7) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), one Bi(1), and one Bi(3) atom. is represented by the CIF file [CIF]
data_Mn2Bi3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.808
_cell_length_b   5.867
_cell_length_c   10.715
_cell_angle_alpha   105.885
_cell_angle_beta   90.007
_cell_angle_gamma   89.998
_symmetry_Int_Tables_number   1
_cell_volume   351.178
_cell_formula_units_Z   2
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
  Mn  Mn0  1  0.512  0.627  0.786  1.0
  Mn  Mn1  1  0.511  0.842  0.214  1.0
  Mn  Mn2  1  0.003  0.379  0.208  1.0
  Mn  Mn3  1  0.003  0.170  0.792  1.0
  Bi  Bi4  1  0.417  0.127  0.000  1.0
  Bi  Bi5  1  0.913  0.834  0.000  1.0
  Bi  Bi6  1  0.039  0.970  0.373  1.0
  Bi  Bi7  1  0.039  0.596  0.627  1.0
  Bi  Bi8  1  0.534  0.052  0.629  1.0
  Bi  Bi9  1  0.533  0.423  0.371  1.0
  O  O10  1  0.535  0.753  0.000  1.0
  O  O11  1  0.033  0.208  1.000  1.0
  O  O12  1  0.427  0.080  0.436  1.0
  O  O13  1  0.427  0.643  0.564  1.0
  O  O14  1  0.936  0.951  0.576  1.0
  O  O15  1  0.936  0.375  0.424  1.0
  O  O16  1  0.277  0.632  0.255  1.0
  O  O17  1  0.277  0.377  0.745  1.0
  O  O18  1  0.753  0.395  0.739  1.0
  O  O19  1  0.752  0.657  0.261  1.0
  O  O20  1  0.279  0.073  0.186  1.0
  O  O21  1  0.280  0.887  0.814  1.0
  O  O22  1  0.762  0.880  0.814  1.0
  O  O23  1  0.762  0.066  0.186  1.0
[/CIF]
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The material described by Mn2Bi3O7 crystallizes in the monoclinic Cm space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form distorted corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 9-30°. In the second Mn site, Mn(2) is bonded to one O(2), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 14-30°. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), and two equivalent O(7) atoms. In the second Bi site, Bi(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), and two equivalent O(8) atoms. In the third Bi site, Bi(3) is bonded in a 7-coordinate geometry to one O(3), one O(5), one O(6), one O(7), one O(8), and two equivalent O(4) atoms. In the fourth Bi site, Bi(4) is bonded in a 5-coordinate geometry to one O(4), one O(5), one O(6), and two equivalent O(3) atoms. There are eight inequivalent O sites. In the first O site, O(8) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), one Bi(2), and one Bi(3) atom. In the second O site, O(1) is bonded in a rectangular see-saw-like geometry to two equivalent Mn(1), one Bi(1), and one Bi(2) atom. In the third O site, O(2) is bonded to two equivalent Mn(2), one Bi(1), and one Bi(2) atom to form corner-sharing OMn2Bi2 trigonal pyramids. In the fourth O site, O(3) is bonded to one Mn(1), one Bi(3), and two equivalent Bi(4) atoms to form distorted corner-sharing OMnBi3 trigonal pyramids. In the fifth O site, O(4) is bonded to one Mn(2), one Bi(4), and two equivalent Bi(3) atoms to form distorted OMnBi3 tetrahedra that share corners with two equivalent O(4)MnBi3 tetrahedra,  a cornercorner with one O(2)Mn2Bi2 trigonal pyramid, and corners with four equivalent O(3)MnBi3 trigonal pyramids. In the sixth O site, O(5) is bonded in a distorted see-saw-like geometry to one Mn(1), one Mn(2), one Bi(3), and one Bi(4) atom. In the seventh O site, O(6) is bonded in a distorted see-saw-like geometry to one Mn(1), one Mn(2), one Bi(3), and one Bi(4) atom. In the eighth O site, O(7) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), one Bi(1), and one Bi(3) atom. is represented by the CIF file [CIF]
data_Mn2Bi3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.808
_cell_length_b   5.867
_cell_length_c   10.715
_cell_angle_alpha   105.885
_cell_angle_beta   90.007
_cell_angle_gamma   89.998
_symmetry_Int_Tables_number   1
_cell_volume   351.178
_cell_formula_units_Z   2
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
  Mn  Mn0  1  0.512  0.627  0.786  1.0
  Mn  Mn1  1  0.511  0.842  0.214  1.0
  Mn  Mn2  1  0.003  0.379  0.208  1.0
  Mn  Mn3  1  0.003  0.170  0.792  1.0
  Bi  Bi4  1  0.417  0.127  0.000  1.0
  Bi  Bi5  1  0.913  0.834  0.000  1.0
  Bi  Bi6  1  0.039  0.970  0.373  1.0
  Bi  Bi7  1  0.039  0.596  0.627  1.0
  Bi  Bi8  1  0.534  0.052  0.629  1.0
  Bi  Bi9  1  0.533  0.423  0.371  1.0
  O  O10  1  0.535  0.753  0.000  1.0
  O  O11  1  0.033  0.208  1.000  1.0
  O  O12  1  0.427  0.080  0.436  1.0
  O  O13  1  0.427  0.643  0.564  1.0
  O  O14  1  0.936  0.951  0.576  1.0
  O  O15  1  0.936  0.375  0.424  1.0
  O  O16  1  0.277  0.632  0.255  1.0
  O  O17  1  0.277  0.377  0.745  1.0
  O  O18  1  0.753  0.395  0.739  1.0
  O  O19  1  0.752  0.657  0.261  1.0
  O  O20  1  0.279  0.073  0.186  1.0
  O  O21  1  0.280  0.887  0.814  1.0
  O  O22  1  0.762  0.880  0.814  1.0
  O  O23  1  0.762  0.066  0.186  1.0
[/CIF]
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