The material described by MgTi4Bi2O11 crystallizes in the monoclinic Cm space group. Mg(1) is bonded to one O(1), one O(6), one O(7), and two equivalent O(2) atoms to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Ti(2)O6 octahedra, corners with two equivalent Mg(1)O5 trigonal bipyramids, and  an edgeedge with one Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles are 23°. There are four inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(3), one O(5), one O(6), one O(7), and two equivalent O(9) atoms to form TiO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra,  an edgeedge with one Ti(2)O6 octahedra, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 5°. In the second Ti site, Ti(2) is bonded to one O(4), one O(5), one O(6), one O(8), and two equivalent O(10) atoms to form distorted TiO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles are 28°. In the third Ti site, Ti(3) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(11), one O(3), and two equivalent O(8) atoms. In the fourth Ti site, Ti(4) is bonded in a 5-coordinate geometry to one O(11), one O(2), one O(4), one O(9), and two equivalent O(7) atoms. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(2), one O(8), two equivalent O(1), and two equivalent O(11) atoms. In the second Bi site, Bi(2) is bonded in a 4-coordinate geometry to one O(1), one O(9), and two equivalent O(5) atoms. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Ti(3), one Bi(2), and two equivalent Bi(1) atoms to form distorted OMgTiBi3 trigonal bipyramids that share corners with two equivalent O(1)MgTiBi3 trigonal bipyramids,  a cornercorner with one O(7)MgTi3 trigonal pyramid, and corners with two equivalent O(5)Ti2Bi2 trigonal pyramids. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Mg(1), one Ti(4), and one Bi(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Ti(1) and one Ti(3) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Ti(2) and one Ti(4) atom. In the fifth O site, O(5) is bonded to one Ti(1), one Ti(2), and two equivalent Bi(2) atoms to form OTi2Bi2 trigonal pyramids that share corners with two equivalent O(1)MgTiBi3 trigonal bipyramids,  a cornercorner with one O(7)MgTi3 trigonal pyramid, and corners with two equivalent O(5)Ti2Bi2 trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Mg(1), one Ti(1), and one Ti(2) atom. In the seventh O site, O(7) is bonded to one Mg(1), one Ti(1), and two equivalent Ti(4) atoms to form OMgTi3 trigonal pyramids that share  a cornercorner with one O(1)MgTiBi3 trigonal bipyramid,  a cornercorner with one O(5)Ti2Bi2 trigonal pyramid, and corners with two equivalent O(7)MgTi3 trigonal pyramids. In the eighth O site, O(8) is bonded in a distorted see-saw-like geometry to one Ti(2), two equivalent Ti(3), and one Bi(1) atom. In the ninth O site, O(9) is bonded in a distorted rectangular see-saw-like geometry to one Ti(4), two equivalent Ti(1), and one Bi(2) atom. In the tenth O site, O(10) is bonded in a distorted T-shaped geometry to one Ti(3) and two equivalent Ti(2) atoms. In the eleventh O site, O(11) is bonded in a linear geometry to one Ti(3), one Ti(4), and two equivalent Bi(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgTi4Bi2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.915
_cell_length_b   7.658
_cell_length_c   8.201
_cell_angle_alpha   88.505
_cell_angle_beta   76.200
_cell_angle_gamma   75.193
_symmetry_Int_Tables_number   1
_cell_volume   230.723
_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  0.732  0.403  0.132  1.0
  Ti  Ti1  1  0.632  0.271  0.466  1.0
  Ti  Ti2  1  0.388  0.696  0.528  1.0
  Ti  Ti3  1  0.656  0.907  0.781  1.0
  Ti  Ti4  1  0.334  0.086  0.247  1.0
  Bi  Bi5  1  0.111  0.721  0.058  1.0
  Bi  Bi6  1  0.935  0.360  0.770  1.0
  O  O7  1  0.718  0.619  0.947  1.0
  O  O8  1  0.255  0.412  0.077  1.0
  O  O9  1  0.612  0.112  0.665  1.0
  O  O10  1  0.381  0.880  0.358  1.0
  O  O11  1  0.433  0.466  0.670  1.0
  O  O12  1  0.564  0.512  0.361  1.0
  O  O13  1  0.808  0.152  0.233  1.0
  O  O14  1  0.188  0.840  0.784  1.0
  O  O15  1  0.138  0.259  0.466  1.0
  O  O16  1  0.845  0.725  0.585  1.0
  O  O17  1  0.503  0.980  0.014  1.0
[/CIF]
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The material described by MgTi4Bi2O11 crystallizes in the monoclinic Cm space group. Mg(1) is bonded to one O(1), one O(6), one O(7), and two equivalent O(2) atoms to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Ti(2)O6 octahedra, corners with two equivalent Mg(1)O5 trigonal bipyramids, and  an edgeedge with one Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles are 23°. There are four inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(3), one O(5), one O(6), one O(7), and two equivalent O(9) atoms to form TiO6 octahedra that share corners with two equivalent Ti(1)O6 octahedra,  an edgeedge with one Ti(2)O6 octahedra, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 5°. In the second Ti site, Ti(2) is bonded to one O(4), one O(5), one O(6), one O(8), and two equivalent O(10) atoms to form distorted TiO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles are 28°. In the third Ti site, Ti(3) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(11), one O(3), and two equivalent O(8) atoms. In the fourth Ti site, Ti(4) is bonded in a 5-coordinate geometry to one O(11), one O(2), one O(4), one O(9), and two equivalent O(7) atoms. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(2), one O(8), two equivalent O(1), and two equivalent O(11) atoms. In the second Bi site, Bi(2) is bonded in a 4-coordinate geometry to one O(1), one O(9), and two equivalent O(5) atoms. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Ti(3), one Bi(2), and two equivalent Bi(1) atoms to form distorted OMgTiBi3 trigonal bipyramids that share corners with two equivalent O(1)MgTiBi3 trigonal bipyramids,  a cornercorner with one O(7)MgTi3 trigonal pyramid, and corners with two equivalent O(5)Ti2Bi2 trigonal pyramids. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Mg(1), one Ti(4), and one Bi(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Ti(1) and one Ti(3) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Ti(2) and one Ti(4) atom. In the fifth O site, O(5) is bonded to one Ti(1), one Ti(2), and two equivalent Bi(2) atoms to form OTi2Bi2 trigonal pyramids that share corners with two equivalent O(1)MgTiBi3 trigonal bipyramids,  a cornercorner with one O(7)MgTi3 trigonal pyramid, and corners with two equivalent O(5)Ti2Bi2 trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Mg(1), one Ti(1), and one Ti(2) atom. In the seventh O site, O(7) is bonded to one Mg(1), one Ti(1), and two equivalent Ti(4) atoms to form OMgTi3 trigonal pyramids that share  a cornercorner with one O(1)MgTiBi3 trigonal bipyramid,  a cornercorner with one O(5)Ti2Bi2 trigonal pyramid, and corners with two equivalent O(7)MgTi3 trigonal pyramids. In the eighth O site, O(8) is bonded in a distorted see-saw-like geometry to one Ti(2), two equivalent Ti(3), and one Bi(1) atom. In the ninth O site, O(9) is bonded in a distorted rectangular see-saw-like geometry to one Ti(4), two equivalent Ti(1), and one Bi(2) atom. In the tenth O site, O(10) is bonded in a distorted T-shaped geometry to one Ti(3) and two equivalent Ti(2) atoms. In the eleventh O site, O(11) is bonded in a linear geometry to one Ti(3), one Ti(4), and two equivalent Bi(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgTi4Bi2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.915
_cell_length_b   7.658
_cell_length_c   8.201
_cell_angle_alpha   88.505
_cell_angle_beta   76.200
_cell_angle_gamma   75.193
_symmetry_Int_Tables_number   1
_cell_volume   230.723
_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  0.732  0.403  0.132  1.0
  Ti  Ti1  1  0.632  0.271  0.466  1.0
  Ti  Ti2  1  0.388  0.696  0.528  1.0
  Ti  Ti3  1  0.656  0.907  0.781  1.0
  Ti  Ti4  1  0.334  0.086  0.247  1.0
  Bi  Bi5  1  0.111  0.721  0.058  1.0
  Bi  Bi6  1  0.935  0.360  0.770  1.0
  O  O7  1  0.718  0.619  0.947  1.0
  O  O8  1  0.255  0.412  0.077  1.0
  O  O9  1  0.612  0.112  0.665  1.0
  O  O10  1  0.381  0.880  0.358  1.0
  O  O11  1  0.433  0.466  0.670  1.0
  O  O12  1  0.564  0.512  0.361  1.0
  O  O13  1  0.808  0.152  0.233  1.0
  O  O14  1  0.188  0.840  0.784  1.0
  O  O15  1  0.138  0.259  0.466  1.0
  O  O16  1  0.845  0.725  0.585  1.0
  O  O17  1  0.503  0.980  0.014  1.0
[/CIF]
.