The material structure described by Nb8Mn3FeO24 crystallizes in the monoclinic P2 space group. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(4), one O(6), one O(8), and one O(9) atom. In the second Nb site, Nb(2) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(5), and one O(7) atom. In the third Nb site, Nb(3) is bonded in a 6-coordinate geometry to one O(11), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. In the fourth Nb site, Nb(4) is bonded in a 6-coordinate geometry to one O(1), one O(12), one O(3), one O(4), one O(5), and one O(7) atom. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(11), two equivalent O(6), and two equivalent O(9) atoms to form edge-sharing MnO6 octahedra. In the second Mn site, Mn(2) is bonded to two equivalent O(10), two equivalent O(12), and two equivalent O(7) atoms to form MnO6 octahedra that share edges with two equivalent Fe(1)O6 octahedra. In the third Mn site, Mn(3) is bonded to two equivalent O(11), two equivalent O(8), and two equivalent O(9) atoms to form edge-sharing MnO6 octahedra. Fe(1) is bonded to two equivalent O(10), two equivalent O(12), and two equivalent O(5) atoms to form FeO6 octahedra that share edges with two equivalent Mn(2)O6 octahedra. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Nb(1), one Nb(2), and one Nb(4) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Nb(1), one Nb(2), and one Nb(3) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Nb(2), one Nb(3), and one Nb(4) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Nb(1), one Nb(3), and one Nb(4) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Nb(2), one Nb(4), and one Fe(1) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Nb(1), one Nb(3), and one Mn(1) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Nb(2), one Nb(4), and one Mn(2) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Nb(1), one Nb(3), and one Mn(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Nb(1), one Mn(1), and one Mn(3) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Nb(2), one Mn(2), and one Fe(1) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Nb(3), one Mn(1), and one Mn(3) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Nb(4), one Mn(2), and one Fe(1) atom. is represented by the CIF file [CIF]
data_Mn3Nb8FeO24
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.886
_cell_length_b   5.144
_cell_length_c   14.592
_cell_angle_alpha   89.845
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   441.786
_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
  Mn  Mn0  1  0.176  0.000  0.500  1.0
  Mn  Mn1  1  0.673  0.000  0.000  1.0
  Mn  Mn2  1  0.824  0.500  0.500  1.0
  Nb  Nb3  1  0.318  0.508  0.663  1.0
  Nb  Nb4  1  0.181  0.007  0.839  1.0
  Nb  Nb5  1  0.181  0.993  0.161  1.0
  Nb  Nb6  1  0.318  0.492  0.337  1.0
  Nb  Nb7  1  0.681  0.992  0.338  1.0
  Nb  Nb8  1  0.819  0.491  0.162  1.0
  Nb  Nb9  1  0.819  0.509  0.838  1.0
  Nb  Nb10  1  0.681  0.008  0.662  1.0
  Fe  Fe11  1  0.331  0.500  0.000  1.0
  O  O12  1  0.128  0.662  0.244  1.0
  O  O13  1  0.372  0.161  0.255  1.0
  O  O14  1  0.372  0.839  0.745  1.0
  O  O15  1  0.128  0.338  0.756  1.0
  O  O16  1  0.872  0.838  0.756  1.0
  O  O17  1  0.629  0.339  0.745  1.0
  O  O18  1  0.629  0.661  0.255  1.0
  O  O19  1  0.872  0.162  0.244  1.0
  O  O20  1  0.102  0.686  0.903  1.0
  O  O21  1  0.400  0.190  0.599  1.0
  O  O22  1  0.400  0.810  0.401  1.0
  O  O23  1  0.102  0.314  0.097  1.0
  O  O24  1  0.898  0.813  0.098  1.0
  O  O25  1  0.601  0.310  0.401  1.0
  O  O26  1  0.601  0.690  0.599  1.0
  O  O27  1  0.898  0.187  0.902  1.0
  O  O28  1  0.118  0.654  0.581  1.0
  O  O29  1  0.380  0.159  0.919  1.0
  O  O30  1  0.380  0.841  0.081  1.0
  O  O31  1  0.118  0.346  0.419  1.0
  O  O32  1  0.882  0.846  0.419  1.0
  O  O33  1  0.616  0.348  0.081  1.0
  O  O34  1  0.616  0.652  0.919  1.0
  O  O35  1  0.882  0.154  0.581  1.0
[/CIF]
.
The material structure described by Nb8Mn3FeO24 crystallizes in the monoclinic P2 space group. There are four inequivalent Nb sites. In the first Nb site, Nb(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(4), one O(6), one O(8), and one O(9) atom. In the second Nb site, Nb(2) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(5), and one O(7) atom. In the third Nb site, Nb(3) is bonded in a 6-coordinate geometry to one O(11), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. In the fourth Nb site, Nb(4) is bonded in a 6-coordinate geometry to one O(1), one O(12), one O(3), one O(4), one O(5), and one O(7) atom. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(11), two equivalent O(6), and two equivalent O(9) atoms to form edge-sharing MnO6 octahedra. In the second Mn site, Mn(2) is bonded to two equivalent O(10), two equivalent O(12), and two equivalent O(7) atoms to form MnO6 octahedra that share edges with two equivalent Fe(1)O6 octahedra. In the third Mn site, Mn(3) is bonded to two equivalent O(11), two equivalent O(8), and two equivalent O(9) atoms to form edge-sharing MnO6 octahedra. Fe(1) is bonded to two equivalent O(10), two equivalent O(12), and two equivalent O(5) atoms to form FeO6 octahedra that share edges with two equivalent Mn(2)O6 octahedra. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Nb(1), one Nb(2), and one Nb(4) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Nb(1), one Nb(2), and one Nb(3) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Nb(2), one Nb(3), and one Nb(4) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Nb(1), one Nb(3), and one Nb(4) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Nb(2), one Nb(4), and one Fe(1) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Nb(1), one Nb(3), and one Mn(1) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Nb(2), one Nb(4), and one Mn(2) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Nb(1), one Nb(3), and one Mn(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Nb(1), one Mn(1), and one Mn(3) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Nb(2), one Mn(2), and one Fe(1) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Nb(3), one Mn(1), and one Mn(3) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Nb(4), one Mn(2), and one Fe(1) atom. is represented by the CIF file [CIF]
data_Mn3Nb8FeO24
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.886
_cell_length_b   5.144
_cell_length_c   14.592
_cell_angle_alpha   89.845
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   441.786
_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
  Mn  Mn0  1  0.176  0.000  0.500  1.0
  Mn  Mn1  1  0.673  0.000  0.000  1.0
  Mn  Mn2  1  0.824  0.500  0.500  1.0
  Nb  Nb3  1  0.318  0.508  0.663  1.0
  Nb  Nb4  1  0.181  0.007  0.839  1.0
  Nb  Nb5  1  0.181  0.993  0.161  1.0
  Nb  Nb6  1  0.318  0.492  0.337  1.0
  Nb  Nb7  1  0.681  0.992  0.338  1.0
  Nb  Nb8  1  0.819  0.491  0.162  1.0
  Nb  Nb9  1  0.819  0.509  0.838  1.0
  Nb  Nb10  1  0.681  0.008  0.662  1.0
  Fe  Fe11  1  0.331  0.500  0.000  1.0
  O  O12  1  0.128  0.662  0.244  1.0
  O  O13  1  0.372  0.161  0.255  1.0
  O  O14  1  0.372  0.839  0.745  1.0
  O  O15  1  0.128  0.338  0.756  1.0
  O  O16  1  0.872  0.838  0.756  1.0
  O  O17  1  0.629  0.339  0.745  1.0
  O  O18  1  0.629  0.661  0.255  1.0
  O  O19  1  0.872  0.162  0.244  1.0
  O  O20  1  0.102  0.686  0.903  1.0
  O  O21  1  0.400  0.190  0.599  1.0
  O  O22  1  0.400  0.810  0.401  1.0
  O  O23  1  0.102  0.314  0.097  1.0
  O  O24  1  0.898  0.813  0.098  1.0
  O  O25  1  0.601  0.310  0.401  1.0
  O  O26  1  0.601  0.690  0.599  1.0
  O  O27  1  0.898  0.187  0.902  1.0
  O  O28  1  0.118  0.654  0.581  1.0
  O  O29  1  0.380  0.159  0.919  1.0
  O  O30  1  0.380  0.841  0.081  1.0
  O  O31  1  0.118  0.346  0.419  1.0
  O  O32  1  0.882  0.846  0.419  1.0
  O  O33  1  0.616  0.348  0.081  1.0
  O  O34  1  0.616  0.652  0.919  1.0
  O  O35  1  0.882  0.154  0.581  1.0
[/CIF]
.