The compound described by Mg2Ta2CoO8 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. Co(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form edge-sharing CoO6 octahedra. There are four inequivalent O sites. In the first 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. In the second O site, O(1) is bonded in a trigonal planar geometry to two equivalent Ta(1) and one Co(1) atom. In the third O site, O(2) is bonded in a distorted trigonal planar geometry to one Ta(1) and two equivalent Co(1) atoms. In the fourth O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Mg(1) and two equivalent Ta(1) atoms. is represented by the CIF file [CIF]
data_Mg2Ta2CoO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.206
_cell_length_b   6.007
_cell_length_c   10.002
_cell_angle_alpha   107.464
_cell_angle_beta   89.714
_cell_angle_gamma   89.994
_symmetry_Int_Tables_number   1
_cell_volume   298.398
_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
  Co  Co0  1  0.751  0.356  0.999  1.0
  Co  Co1  1  0.251  0.643  1.000  1.0
  Mg  Mg2  1  0.756  0.584  0.454  1.0
  Mg  Mg3  1  0.745  0.129  0.545  1.0
  Mg  Mg4  1  0.246  0.416  0.545  1.0
  Mg  Mg5  1  0.256  0.870  0.454  1.0
  O  O6  1  0.079  0.816  0.857  1.0
  O  O7  1  0.423  0.958  0.142  1.0
  O  O8  1  0.923  0.183  0.141  1.0
  O  O9  1  0.579  0.041  0.857  1.0
  O  O10  1  0.588  0.569  0.883  1.0
  O  O11  1  0.914  0.684  0.116  1.0
  O  O12  1  0.414  0.430  0.116  1.0
  O  O13  1  0.088  0.314  0.883  1.0
  O  O14  1  0.455  0.711  0.627  1.0
  O  O15  1  0.046  0.082  0.372  1.0
  O  O16  1  0.955  0.917  0.627  1.0
  O  O17  1  0.546  0.288  0.372  1.0
  O  O18  1  0.380  0.163  0.617  1.0
  O  O19  1  0.122  0.545  0.382  1.0
  O  O20  1  0.622  0.836  0.381  1.0
  O  O21  1  0.880  0.454  0.617  1.0
  Ta  Ta22  1  0.743  0.720  0.768  1.0
  Ta  Ta23  1  0.759  0.951  0.230  1.0
  Ta  Ta24  1  0.258  0.278  0.231  1.0
  Ta  Ta25  1  0.243  0.048  0.768  1.0
[/CIF]
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The compound described by Mg2Ta2CoO8 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. Co(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form edge-sharing CoO6 octahedra. There are four inequivalent O sites. In the first 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. In the second O site, O(1) is bonded in a trigonal planar geometry to two equivalent Ta(1) and one Co(1) atom. In the third O site, O(2) is bonded in a distorted trigonal planar geometry to one Ta(1) and two equivalent Co(1) atoms. In the fourth O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Mg(1) and two equivalent Ta(1) atoms. is represented by the CIF file [CIF]
data_Mg2Ta2CoO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.206
_cell_length_b   6.007
_cell_length_c   10.002
_cell_angle_alpha   107.464
_cell_angle_beta   89.714
_cell_angle_gamma   89.994
_symmetry_Int_Tables_number   1
_cell_volume   298.398
_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
  Co  Co0  1  0.751  0.356  0.999  1.0
  Co  Co1  1  0.251  0.643  1.000  1.0
  Mg  Mg2  1  0.756  0.584  0.454  1.0
  Mg  Mg3  1  0.745  0.129  0.545  1.0
  Mg  Mg4  1  0.246  0.416  0.545  1.0
  Mg  Mg5  1  0.256  0.870  0.454  1.0
  O  O6  1  0.079  0.816  0.857  1.0
  O  O7  1  0.423  0.958  0.142  1.0
  O  O8  1  0.923  0.183  0.141  1.0
  O  O9  1  0.579  0.041  0.857  1.0
  O  O10  1  0.588  0.569  0.883  1.0
  O  O11  1  0.914  0.684  0.116  1.0
  O  O12  1  0.414  0.430  0.116  1.0
  O  O13  1  0.088  0.314  0.883  1.0
  O  O14  1  0.455  0.711  0.627  1.0
  O  O15  1  0.046  0.082  0.372  1.0
  O  O16  1  0.955  0.917  0.627  1.0
  O  O17  1  0.546  0.288  0.372  1.0
  O  O18  1  0.380  0.163  0.617  1.0
  O  O19  1  0.122  0.545  0.382  1.0
  O  O20  1  0.622  0.836  0.381  1.0
  O  O21  1  0.880  0.454  0.617  1.0
  Ta  Ta22  1  0.743  0.720  0.768  1.0
  Ta  Ta23  1  0.759  0.951  0.230  1.0
  Ta  Ta24  1  0.258  0.278  0.231  1.0
  Ta  Ta25  1  0.243  0.048  0.768  1.0
[/CIF]
.