The crystal structure described by Mg2Ta2FeO8 crystallizes in the monoclinic C2/c space group. Mg(1) is bonded in a 6-coordinate geometry to three equivalent O(3) and three equivalent O(4) atoms. Ta(1) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. Fe(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form edge-sharing FeO6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Ta(1) and one Fe(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ta(1) and two equivalent Fe(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Mg(1) and two equivalent Ta(1) atoms. In the fourth O site, O(4) is bonded to three equivalent Mg(1) and one Ta(1) atom to form a mixture of corner and edge-sharing OMg3Ta trigonal pyramids. is represented by the CIF card [CIF]
data_Mg2Ta2FeO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.212
_cell_length_b   6.025
_cell_length_c   10.081
_cell_angle_alpha   107.430
_cell_angle_beta   89.641
_cell_angle_gamma   89.987
_symmetry_Int_Tables_number   1
_cell_volume   302.062
_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
  Mg  Mg0  1  0.752  0.415  0.545  1.0
  Mg  Mg1  1  0.744  0.870  0.455  1.0
  Mg  Mg2  1  0.244  0.586  0.455  1.0
  Mg  Mg3  1  0.252  0.131  0.545  1.0
  Ta  Ta4  1  0.744  0.282  0.234  1.0
  Ta  Ta5  1  0.752  0.048  0.766  1.0
  Ta  Ta6  1  0.252  0.719  0.766  1.0
  Ta  Ta7  1  0.244  0.953  0.234  1.0
  Fe  Fe8  1  0.748  0.648  1.000  1.0
  Fe  Fe9  1  0.248  0.352  1.000  1.0
  O  O10  1  0.080  0.181  0.144  1.0
  O  O11  1  0.415  0.038  0.856  1.0
  O  O12  1  0.915  0.819  0.856  1.0
  O  O13  1  0.580  0.963  0.144  1.0
  O  O14  1  0.594  0.434  0.120  1.0
  O  O15  1  0.902  0.313  0.880  1.0
  O  O16  1  0.402  0.567  0.879  1.0
  O  O17  1  0.095  0.687  0.120  1.0
  O  O18  1  0.454  0.291  0.373  1.0
  O  O19  1  0.041  0.917  0.626  1.0
  O  O20  1  0.380  0.838  0.383  1.0
  O  O21  1  0.116  0.455  0.617  1.0
  O  O22  1  0.616  0.163  0.617  1.0
  O  O23  1  0.880  0.546  0.383  1.0
  O  O24  1  0.954  0.084  0.373  1.0
  O  O25  1  0.541  0.710  0.626  1.0
[/CIF]
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The crystal structure described by Mg2Ta2FeO8 crystallizes in the monoclinic C2/c space group. Mg(1) is bonded in a 6-coordinate geometry to three equivalent O(3) and three equivalent O(4) atoms. Ta(1) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. Fe(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form edge-sharing FeO6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Ta(1) and one Fe(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ta(1) and two equivalent Fe(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Mg(1) and two equivalent Ta(1) atoms. In the fourth O site, O(4) is bonded to three equivalent Mg(1) and one Ta(1) atom to form a mixture of corner and edge-sharing OMg3Ta trigonal pyramids. is represented by the CIF card [CIF]
data_Mg2Ta2FeO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.212
_cell_length_b   6.025
_cell_length_c   10.081
_cell_angle_alpha   107.430
_cell_angle_beta   89.641
_cell_angle_gamma   89.987
_symmetry_Int_Tables_number   1
_cell_volume   302.062
_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
  Mg  Mg0  1  0.752  0.415  0.545  1.0
  Mg  Mg1  1  0.744  0.870  0.455  1.0
  Mg  Mg2  1  0.244  0.586  0.455  1.0
  Mg  Mg3  1  0.252  0.131  0.545  1.0
  Ta  Ta4  1  0.744  0.282  0.234  1.0
  Ta  Ta5  1  0.752  0.048  0.766  1.0
  Ta  Ta6  1  0.252  0.719  0.766  1.0
  Ta  Ta7  1  0.244  0.953  0.234  1.0
  Fe  Fe8  1  0.748  0.648  1.000  1.0
  Fe  Fe9  1  0.248  0.352  1.000  1.0
  O  O10  1  0.080  0.181  0.144  1.0
  O  O11  1  0.415  0.038  0.856  1.0
  O  O12  1  0.915  0.819  0.856  1.0
  O  O13  1  0.580  0.963  0.144  1.0
  O  O14  1  0.594  0.434  0.120  1.0
  O  O15  1  0.902  0.313  0.880  1.0
  O  O16  1  0.402  0.567  0.879  1.0
  O  O17  1  0.095  0.687  0.120  1.0
  O  O18  1  0.454  0.291  0.373  1.0
  O  O19  1  0.041  0.917  0.626  1.0
  O  O20  1  0.380  0.838  0.383  1.0
  O  O21  1  0.116  0.455  0.617  1.0
  O  O22  1  0.616  0.163  0.617  1.0
  O  O23  1  0.880  0.546  0.383  1.0
  O  O24  1  0.954  0.084  0.373  1.0
  O  O25  1  0.541  0.710  0.626  1.0
[/CIF]
.