The material described by MgTa4Nb4Mn4O24 crystallizes in the monoclinic P2 space group. Mg(1) is bonded to two equivalent O(11), two equivalent O(5), and two equivalent O(9) atoms to form MgO6 octahedra that share corners with four equivalent Ta(1)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-51°. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(11), one O(2), one O(3), one O(4), one O(7), and one O(9) atom to form distorted TaO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, and corners with two equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-58°. In the second Ta site, Ta(2) is bonded to one O(1), one O(10), one O(12), one O(3), one O(4), and one O(8) atom to form distorted TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and edges with two equivalent Nb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-57°. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(2), one O(4), one O(5), and one O(9) atom. In the second Nb site, Nb(2) is bonded to one O(1), one O(10), one O(12), one O(2), one O(3), and one O(6) atom to form distorted NbO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and edges with two equivalent Ta(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-60°. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(5), two equivalent O(7), and two equivalent O(9) atoms to form MnO6 octahedra that share corners with four equivalent Ta(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-58°. In the second Mn site, Mn(2) is bonded to two equivalent O(10), two equivalent O(6), and two equivalent O(8) atoms to form MnO6 octahedra that share corners with four equivalent Ta(2)O6 octahedra, corners with four equivalent Nb(2)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-60°. In the third Mn site, Mn(3) is bonded to two equivalent O(11), two equivalent O(5), and two equivalent O(7) atoms to form MnO6 octahedra that share corners with four equivalent Ta(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-57°. In the fourth Mn site, Mn(4) is bonded to two equivalent O(12), two equivalent O(6), and two equivalent O(8) atoms to form MnO6 octahedra that share corners with four equivalent Ta(2)O6 octahedra, corners with four equivalent Nb(2)O6 octahedra, and edges with two equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-57°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ta(2), one Nb(1), and one Nb(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ta(1), one Nb(1), and one Nb(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(2), and one Nb(2) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Ta(1), one Ta(2), and one Nb(1) atom. In the fifth O site, O(5) is bonded to one Mg(1), one Nb(1), one Mn(1), and one Mn(3) atom to form OMgMn2Nb trigonal pyramids that share  a cornercorner with one O(5)MgMn2Nb trigonal pyramid,  a cornercorner with one O(9)MgTaMnNb trigonal pyramid,  an edgeedge with one O(5)MgMn2Nb trigonal pyramid, and edges with two equivalent O(9)MgTaMnNb trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Nb(2), one Mn(2), and one Mn(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ta(1), one Mn(1), and one Mn(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Ta(2), one Mn(2), and one Mn(4) atom. In the ninth O site, O(9) is bonded to one Mg(1), one Ta(1), one Nb(1), and one Mn(1) atom to form distorted OMgTaMnNb trigonal pyramids that share  a cornercorner with one O(5)MgMn2Nb trigonal pyramid, corners with two equivalent O(9)MgTaMnNb trigonal pyramids, and edges with two equivalent O(5)MgMn2Nb trigonal pyramids. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Ta(2), one Nb(2), and one Mn(2) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Mg(1), one Ta(1), one Nb(1), and one Mn(3) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Ta(2), one Nb(2), and one Mn(4) atom. is represented by the CIF card [CIF]
data_MgTa4Mn4Nb4O24
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.183
_cell_length_b   5.947
_cell_length_c   14.665
_cell_angle_alpha   90.000
_cell_angle_beta   89.972
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   452.021
_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  0.750  0.427  1.000  1.0
  Ta  Ta1  1  0.260  0.677  0.158  1.0
  Ta  Ta2  1  0.766  0.815  0.341  1.0
  Ta  Ta3  1  0.734  0.815  0.659  1.0
  Ta  Ta4  1  0.240  0.677  0.842  1.0
  Mn  Mn5  1  0.250  0.173  1.000  1.0
  Mn  Mn6  1  0.750  0.316  0.500  1.0
  Mn  Mn7  1  0.750  0.894  1.000  1.0
  Mn  Mn8  1  0.250  0.656  0.500  1.0
  Nb  Nb9  1  0.736  0.330  0.814  1.0
  Nb  Nb10  1  0.238  0.160  0.660  1.0
  Nb  Nb11  1  0.262  0.160  0.340  1.0
  Nb  Nb12  1  0.764  0.330  0.186  1.0
  O  O13  1  0.904  0.107  0.741  1.0
  O  O14  1  0.386  0.376  0.759  1.0
  O  O15  1  0.114  0.376  0.241  1.0
  O  O16  1  0.596  0.107  0.259  1.0
  O  O17  1  0.088  0.859  0.255  1.0
  O  O18  1  0.596  0.621  0.243  1.0
  O  O19  1  0.904  0.621  0.757  1.0
  O  O20  1  0.412  0.859  0.745  1.0
  O  O21  1  0.602  0.173  0.920  1.0
  O  O22  1  0.096  0.362  0.580  1.0
  O  O23  1  0.404  0.362  0.420  1.0
  O  O24  1  0.898  0.173  0.080  1.0
  O  O25  1  0.405  0.893  0.083  1.0
  O  O26  1  0.903  0.601  0.417  1.0
  O  O27  1  0.597  0.601  0.583  1.0
  O  O28  1  0.095  0.893  0.917  1.0
  O  O29  1  0.046  0.415  0.904  1.0
  O  O30  1  0.570  0.079  0.598  1.0
  O  O31  1  0.930  0.079  0.402  1.0
  O  O32  1  0.454  0.415  0.096  1.0
  O  O33  1  0.944  0.624  0.092  1.0
  O  O34  1  0.440  0.877  0.401  1.0
  O  O35  1  0.060  0.877  0.599  1.0
  O  O36  1  0.556  0.624  0.908  1.0
[/CIF]
.
The material described by MgTa4Nb4Mn4O24 crystallizes in the monoclinic P2 space group. Mg(1) is bonded to two equivalent O(11), two equivalent O(5), and two equivalent O(9) atoms to form MgO6 octahedra that share corners with four equivalent Ta(1)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-51°. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(11), one O(2), one O(3), one O(4), one O(7), and one O(9) atom to form distorted TaO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Ta(2)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, and corners with two equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-58°. In the second Ta site, Ta(2) is bonded to one O(1), one O(10), one O(12), one O(3), one O(4), and one O(8) atom to form distorted TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and edges with two equivalent Nb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-57°. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(2), one O(4), one O(5), and one O(9) atom. In the second Nb site, Nb(2) is bonded to one O(1), one O(10), one O(12), one O(2), one O(3), and one O(6) atom to form distorted NbO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and edges with two equivalent Ta(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-60°. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(5), two equivalent O(7), and two equivalent O(9) atoms to form MnO6 octahedra that share corners with four equivalent Ta(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-58°. In the second Mn site, Mn(2) is bonded to two equivalent O(10), two equivalent O(6), and two equivalent O(8) atoms to form MnO6 octahedra that share corners with four equivalent Ta(2)O6 octahedra, corners with four equivalent Nb(2)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-60°. In the third Mn site, Mn(3) is bonded to two equivalent O(11), two equivalent O(5), and two equivalent O(7) atoms to form MnO6 octahedra that share corners with four equivalent Ta(1)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-57°. In the fourth Mn site, Mn(4) is bonded to two equivalent O(12), two equivalent O(6), and two equivalent O(8) atoms to form MnO6 octahedra that share corners with four equivalent Ta(2)O6 octahedra, corners with four equivalent Nb(2)O6 octahedra, and edges with two equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-57°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ta(2), one Nb(1), and one Nb(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ta(1), one Nb(1), and one Nb(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(2), and one Nb(2) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Ta(1), one Ta(2), and one Nb(1) atom. In the fifth O site, O(5) is bonded to one Mg(1), one Nb(1), one Mn(1), and one Mn(3) atom to form OMgMn2Nb trigonal pyramids that share  a cornercorner with one O(5)MgMn2Nb trigonal pyramid,  a cornercorner with one O(9)MgTaMnNb trigonal pyramid,  an edgeedge with one O(5)MgMn2Nb trigonal pyramid, and edges with two equivalent O(9)MgTaMnNb trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Nb(2), one Mn(2), and one Mn(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ta(1), one Mn(1), and one Mn(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Ta(2), one Mn(2), and one Mn(4) atom. In the ninth O site, O(9) is bonded to one Mg(1), one Ta(1), one Nb(1), and one Mn(1) atom to form distorted OMgTaMnNb trigonal pyramids that share  a cornercorner with one O(5)MgMn2Nb trigonal pyramid, corners with two equivalent O(9)MgTaMnNb trigonal pyramids, and edges with two equivalent O(5)MgMn2Nb trigonal pyramids. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Ta(2), one Nb(2), and one Mn(2) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Mg(1), one Ta(1), one Nb(1), and one Mn(3) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Ta(2), one Nb(2), and one Mn(4) atom. is represented by the CIF card [CIF]
data_MgTa4Mn4Nb4O24
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.183
_cell_length_b   5.947
_cell_length_c   14.665
_cell_angle_alpha   90.000
_cell_angle_beta   89.972
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   452.021
_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  0.750  0.427  1.000  1.0
  Ta  Ta1  1  0.260  0.677  0.158  1.0
  Ta  Ta2  1  0.766  0.815  0.341  1.0
  Ta  Ta3  1  0.734  0.815  0.659  1.0
  Ta  Ta4  1  0.240  0.677  0.842  1.0
  Mn  Mn5  1  0.250  0.173  1.000  1.0
  Mn  Mn6  1  0.750  0.316  0.500  1.0
  Mn  Mn7  1  0.750  0.894  1.000  1.0
  Mn  Mn8  1  0.250  0.656  0.500  1.0
  Nb  Nb9  1  0.736  0.330  0.814  1.0
  Nb  Nb10  1  0.238  0.160  0.660  1.0
  Nb  Nb11  1  0.262  0.160  0.340  1.0
  Nb  Nb12  1  0.764  0.330  0.186  1.0
  O  O13  1  0.904  0.107  0.741  1.0
  O  O14  1  0.386  0.376  0.759  1.0
  O  O15  1  0.114  0.376  0.241  1.0
  O  O16  1  0.596  0.107  0.259  1.0
  O  O17  1  0.088  0.859  0.255  1.0
  O  O18  1  0.596  0.621  0.243  1.0
  O  O19  1  0.904  0.621  0.757  1.0
  O  O20  1  0.412  0.859  0.745  1.0
  O  O21  1  0.602  0.173  0.920  1.0
  O  O22  1  0.096  0.362  0.580  1.0
  O  O23  1  0.404  0.362  0.420  1.0
  O  O24  1  0.898  0.173  0.080  1.0
  O  O25  1  0.405  0.893  0.083  1.0
  O  O26  1  0.903  0.601  0.417  1.0
  O  O27  1  0.597  0.601  0.583  1.0
  O  O28  1  0.095  0.893  0.917  1.0
  O  O29  1  0.046  0.415  0.904  1.0
  O  O30  1  0.570  0.079  0.598  1.0
  O  O31  1  0.930  0.079  0.402  1.0
  O  O32  1  0.454  0.415  0.096  1.0
  O  O33  1  0.944  0.624  0.092  1.0
  O  O34  1  0.440  0.877  0.401  1.0
  O  O35  1  0.060  0.877  0.599  1.0
  O  O36  1  0.556  0.624  0.908  1.0
[/CIF]
.