data_Mg2Rh
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.61
_cell_length_b   5.61
_cell_length_c   5.61
_cell_angle_alpha   146.92
_cell_angle_beta   146.92
_cell_angle_gamma   47.48
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Mg2Rh
_chemical_formula_sum   'Mg2 Rh1'
_cell_volume   52.31
_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  0.0  0.0  0.6  1.0
  Mg  Mg1  1  0.0  0.0  0.67  1.0
  Rh  Rh2  1  0.0  0.0  0.0  1.0

data_Mg2Rh
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.51
_cell_length_b   4.51
_cell_length_c   5.61
_cell_angle_alpha   90.0
_cell_angle_beta   113.74
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Mg2Rh
_chemical_formula_sum   'Mg4 Rh2'
_cell_volume   104.61
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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  2  0.1  0.5  0.6  1.0
  Mg  Mg1  2  0.17  0.5  0.67  1.0
  Rh  Rh2  2  0.0  0.0  0.0  1.0

Mg Mg Rh
Mg2Rh crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Mg2Rh clusters. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a single-bond geometry to one Mg(2) atom. The Mg(1)-Mg(2) bond length is 0.39 Å. In the second Mg site, Mg(2) is bonded in a linear geometry to one Mg(1) and one Rh(1) atom. The Mg(2)-Rh(1) bond length is 1.87 Å. Rh(1) is bonded in a single-bond geometry to one Mg(2) atom.