The material described by MgMo2(RhO3)4 crystallizes in the orthorhombic Amm2 space group. Mg(1) is bonded in a 4-coordinate geometry to two equivalent Rh(2), two equivalent O(2), and two equivalent O(5) atoms. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(4), one O(6), and four equivalent O(3) atoms to form MoO6 octahedra that share corners with eight equivalent Rh(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-50°. In the second Mo site, Mo(2) is bonded in a 4-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded to one O(1), one O(2), one O(4), one O(6), and two equivalent O(3) atoms to form RhO6 octahedra that share corners with four equivalent Mo(1)O6 octahedra and  an edgeedge with one Rh(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-50°. In the second Rh site, Rh(2) is bonded in a 7-coordinate geometry to one Mg(1), one O(1), one O(2), two equivalent O(3), and two equivalent O(5) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mo(2), one Rh(1), and one Rh(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Mg(1), one Mo(2), one Rh(1), and one Rh(2) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mo(1), one Rh(1), and one Rh(2) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Mo(1) and two equivalent Rh(1) atoms. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Mg(1), one Mo(2), and two equivalent Rh(2) atoms. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Mo(1) and two equivalent Rh(1) atoms. is represented by the CIF file [CIF]
data_MgMo2(RhO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.724
_cell_length_b   4.724
_cell_length_c   9.789
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   87.705
_symmetry_Int_Tables_number   1
_cell_volume   218.227
_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  0.204  0.204  0.500  1.0
  Mo  Mo1  1  0.996  0.996  0.000  1.0
  Mo  Mo2  1  0.568  0.568  0.500  1.0
  Rh  Rh3  1  0.497  0.497  0.838  1.0
  Rh  Rh4  1  0.985  0.985  0.311  1.0
  Rh  Rh5  1  0.497  0.497  0.162  1.0
  Rh  Rh6  1  0.985  0.985  0.689  1.0
  O  O7  1  0.697  0.697  0.678  1.0
  O  O8  1  0.304  0.304  0.679  1.0
  O  O9  1  0.697  0.697  0.322  1.0
  O  O10  1  0.194  0.803  0.155  1.0
  O  O11  1  0.803  0.194  0.155  1.0
  O  O12  1  0.803  0.194  0.845  1.0
  O  O13  1  0.302  0.302  0.000  1.0
  O  O14  1  0.188  0.780  0.500  1.0
  O  O15  1  0.780  0.188  0.500  1.0
  O  O16  1  0.699  0.699  0.000  1.0
  O  O17  1  0.304  0.304  0.321  1.0
  O  O18  1  0.194  0.803  0.845  1.0
[/CIF]
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The material described by MgMo2(RhO3)4 crystallizes in the orthorhombic Amm2 space group. Mg(1) is bonded in a 4-coordinate geometry to two equivalent Rh(2), two equivalent O(2), and two equivalent O(5) atoms. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(4), one O(6), and four equivalent O(3) atoms to form MoO6 octahedra that share corners with eight equivalent Rh(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-50°. In the second Mo site, Mo(2) is bonded in a 4-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded to one O(1), one O(2), one O(4), one O(6), and two equivalent O(3) atoms to form RhO6 octahedra that share corners with four equivalent Mo(1)O6 octahedra and  an edgeedge with one Rh(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-50°. In the second Rh site, Rh(2) is bonded in a 7-coordinate geometry to one Mg(1), one O(1), one O(2), two equivalent O(3), and two equivalent O(5) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mo(2), one Rh(1), and one Rh(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Mg(1), one Mo(2), one Rh(1), and one Rh(2) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mo(1), one Rh(1), and one Rh(2) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Mo(1) and two equivalent Rh(1) atoms. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Mg(1), one Mo(2), and two equivalent Rh(2) atoms. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Mo(1) and two equivalent Rh(1) atoms. is represented by the CIF file [CIF]
data_MgMo2(RhO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.724
_cell_length_b   4.724
_cell_length_c   9.789
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   87.705
_symmetry_Int_Tables_number   1
_cell_volume   218.227
_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  0.204  0.204  0.500  1.0
  Mo  Mo1  1  0.996  0.996  0.000  1.0
  Mo  Mo2  1  0.568  0.568  0.500  1.0
  Rh  Rh3  1  0.497  0.497  0.838  1.0
  Rh  Rh4  1  0.985  0.985  0.311  1.0
  Rh  Rh5  1  0.497  0.497  0.162  1.0
  Rh  Rh6  1  0.985  0.985  0.689  1.0
  O  O7  1  0.697  0.697  0.678  1.0
  O  O8  1  0.304  0.304  0.679  1.0
  O  O9  1  0.697  0.697  0.322  1.0
  O  O10  1  0.194  0.803  0.155  1.0
  O  O11  1  0.803  0.194  0.155  1.0
  O  O12  1  0.803  0.194  0.845  1.0
  O  O13  1  0.302  0.302  0.000  1.0
  O  O14  1  0.188  0.780  0.500  1.0
  O  O15  1  0.780  0.188  0.500  1.0
  O  O16  1  0.699  0.699  0.000  1.0
  O  O17  1  0.304  0.304  0.321  1.0
  O  O18  1  0.194  0.803  0.845  1.0
[/CIF]
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