The structure described by Sr3MgRhO6 crystallizes in the trigonal R-3c space group. Sr(1) is bonded in a 8-coordinate geometry to eight equivalent O(1) atoms. Mg(1) is bonded to six equivalent O(1) atoms to form distorted MgO6 pentagonal pyramids that share faces with two equivalent Rh(1)O6 octahedra. Rh(1) is bonded to six equivalent O(1) atoms to form RhO6 octahedra that share faces with two equivalent Mg(1)O6 pentagonal pyramids. O(1) is bonded to four equivalent Sr(1), one Mg(1), and one Rh(1) atom to form a mixture of distorted corner, face, and edge-sharing OSr4MgRh octahedra. The corner-sharing octahedral tilt angles range from 0-65°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr3MgRhO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.736
_cell_length_b   6.736
_cell_length_c   6.736
_cell_angle_alpha   92.589
_cell_angle_beta   92.589
_cell_angle_gamma   92.589
_symmetry_Int_Tables_number   1
_cell_volume   304.652
_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
  Sr  Sr0  1  0.615  0.250  0.885  1.0
  Sr  Sr1  1  0.885  0.615  0.250  1.0
  Sr  Sr2  1  0.750  0.115  0.385  1.0
  Sr  Sr3  1  0.385  0.750  0.115  1.0
  Sr  Sr4  1  0.115  0.385  0.750  1.0
  Sr  Sr5  1  0.250  0.885  0.615  1.0
  Mg  Mg6  1  0.250  0.250  0.250  1.0
  Mg  Mg7  1  0.750  0.750  0.750  1.0
  Rh  Rh8  1  0.000  0.000  0.000  1.0
  Rh  Rh9  1  0.500  0.500  0.500  1.0
  O  O10  1  0.594  0.787  0.463  1.0
  O  O11  1  0.463  0.594  0.787  1.0
  O  O12  1  0.787  0.463  0.594  1.0
  O  O13  1  0.906  0.037  0.713  1.0
  O  O14  1  0.713  0.906  0.037  1.0
  O  O15  1  0.037  0.713  0.906  1.0
  O  O16  1  0.406  0.213  0.537  1.0
  O  O17  1  0.537  0.406  0.213  1.0
  O  O18  1  0.213  0.537  0.406  1.0
  O  O19  1  0.094  0.963  0.287  1.0
  O  O20  1  0.963  0.287  0.094  1.0
  O  O21  1  0.287  0.094  0.963  1.0
[/CIF]
.
The structure described by Sr3MgRhO6 crystallizes in the trigonal R-3c space group. Sr(1) is bonded in a 8-coordinate geometry to eight equivalent O(1) atoms. Mg(1) is bonded to six equivalent O(1) atoms to form distorted MgO6 pentagonal pyramids that share faces with two equivalent Rh(1)O6 octahedra. Rh(1) is bonded to six equivalent O(1) atoms to form RhO6 octahedra that share faces with two equivalent Mg(1)O6 pentagonal pyramids. O(1) is bonded to four equivalent Sr(1), one Mg(1), and one Rh(1) atom to form a mixture of distorted corner, face, and edge-sharing OSr4MgRh octahedra. The corner-sharing octahedral tilt angles range from 0-65°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr3MgRhO6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.736
_cell_length_b   6.736
_cell_length_c   6.736
_cell_angle_alpha   92.589
_cell_angle_beta   92.589
_cell_angle_gamma   92.589
_symmetry_Int_Tables_number   1
_cell_volume   304.652
_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
  Sr  Sr0  1  0.615  0.250  0.885  1.0
  Sr  Sr1  1  0.885  0.615  0.250  1.0
  Sr  Sr2  1  0.750  0.115  0.385  1.0
  Sr  Sr3  1  0.385  0.750  0.115  1.0
  Sr  Sr4  1  0.115  0.385  0.750  1.0
  Sr  Sr5  1  0.250  0.885  0.615  1.0
  Mg  Mg6  1  0.250  0.250  0.250  1.0
  Mg  Mg7  1  0.750  0.750  0.750  1.0
  Rh  Rh8  1  0.000  0.000  0.000  1.0
  Rh  Rh9  1  0.500  0.500  0.500  1.0
  O  O10  1  0.594  0.787  0.463  1.0
  O  O11  1  0.463  0.594  0.787  1.0
  O  O12  1  0.787  0.463  0.594  1.0
  O  O13  1  0.906  0.037  0.713  1.0
  O  O14  1  0.713  0.906  0.037  1.0
  O  O15  1  0.037  0.713  0.906  1.0
  O  O16  1  0.406  0.213  0.537  1.0
  O  O17  1  0.537  0.406  0.213  1.0
  O  O18  1  0.213  0.537  0.406  1.0
  O  O19  1  0.094  0.963  0.287  1.0
  O  O20  1  0.963  0.287  0.094  1.0
  O  O21  1  0.287  0.094  0.963  1.0
[/CIF]
.