The compound described by MgCr2(SbO3)4 crystallizes in the tetragonal P-4 space group. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(3) atoms. Cr(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form CrO6 octahedra that share corners with four equivalent Sb(2)O6 octahedra and  an edgeedge with one Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-50°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a rectangular see-saw-like geometry to two equivalent O(2) and two equivalent O(3) atoms. In the second Sb site, Sb(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form SbO6 octahedra that share corners with four equivalent Cr(1)O6 octahedra, corners with four equivalent Sb(2)O6 octahedra, and  an edgeedge with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-50°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Cr(1) and two equivalent Sb(2) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to one Cr(1), one Sb(1), and one Sb(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Cr(1), and one Sb(1) atom. is represented by the CIF card [CIF]
data_MgCr2(SbO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.811
_cell_length_b   4.809
_cell_length_c   10.698
_cell_angle_alpha   89.999
_cell_angle_beta   90.004
_cell_angle_gamma   89.999
_symmetry_Int_Tables_number   1
_cell_volume   247.485
_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  0.000  0.500  0.251  1.0
  Cr  Cr1  1  0.000  1.000  0.984  1.0
  Cr  Cr2  1  0.500  0.500  0.517  1.0
  Sb  Sb3  1  1.000  0.000  0.393  1.0
  Sb  Sb4  1  0.500  0.500  0.818  1.0
  Sb  Sb5  1  0.500  0.500  0.109  1.0
  Sb  Sb6  1  0.000  0.000  0.684  1.0
  O  O7  1  0.190  0.800  0.824  1.0
  O  O8  1  0.208  0.824  0.540  1.0
  O  O9  1  0.155  0.770  0.117  1.0
  O  O10  1  0.270  0.345  0.385  1.0
  O  O11  1  0.325  0.292  0.962  1.0
  O  O12  1  0.300  0.309  0.678  1.0
  O  O13  1  0.730  0.655  0.385  1.0
  O  O14  1  0.675  0.708  0.962  1.0
  O  O15  1  0.700  0.691  0.678  1.0
  O  O16  1  0.810  0.200  0.824  1.0
  O  O17  1  0.792  0.176  0.540  1.0
  O  O18  1  0.845  0.230  0.117  1.0
[/CIF]
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The compound described by MgCr2(SbO3)4 crystallizes in the tetragonal P-4 space group. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(3) atoms. Cr(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form CrO6 octahedra that share corners with four equivalent Sb(2)O6 octahedra and  an edgeedge with one Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-50°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a rectangular see-saw-like geometry to two equivalent O(2) and two equivalent O(3) atoms. In the second Sb site, Sb(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form SbO6 octahedra that share corners with four equivalent Cr(1)O6 octahedra, corners with four equivalent Sb(2)O6 octahedra, and  an edgeedge with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-50°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Cr(1) and two equivalent Sb(2) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to one Cr(1), one Sb(1), and one Sb(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Cr(1), and one Sb(1) atom. is represented by the CIF card [CIF]
data_MgCr2(SbO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.811
_cell_length_b   4.809
_cell_length_c   10.698
_cell_angle_alpha   89.999
_cell_angle_beta   90.004
_cell_angle_gamma   89.999
_symmetry_Int_Tables_number   1
_cell_volume   247.485
_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  0.000  0.500  0.251  1.0
  Cr  Cr1  1  0.000  1.000  0.984  1.0
  Cr  Cr2  1  0.500  0.500  0.517  1.0
  Sb  Sb3  1  1.000  0.000  0.393  1.0
  Sb  Sb4  1  0.500  0.500  0.818  1.0
  Sb  Sb5  1  0.500  0.500  0.109  1.0
  Sb  Sb6  1  0.000  0.000  0.684  1.0
  O  O7  1  0.190  0.800  0.824  1.0
  O  O8  1  0.208  0.824  0.540  1.0
  O  O9  1  0.155  0.770  0.117  1.0
  O  O10  1  0.270  0.345  0.385  1.0
  O  O11  1  0.325  0.292  0.962  1.0
  O  O12  1  0.300  0.309  0.678  1.0
  O  O13  1  0.730  0.655  0.385  1.0
  O  O14  1  0.675  0.708  0.962  1.0
  O  O15  1  0.700  0.691  0.678  1.0
  O  O16  1  0.810  0.200  0.824  1.0
  O  O17  1  0.792  0.176  0.540  1.0
  O  O18  1  0.845  0.230  0.117  1.0
[/CIF]
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