data_GdMgRh2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.68
_cell_length_b   4.68
_cell_length_c   4.68
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   GdMgRh2
_chemical_formula_sum   'Gd1 Mg1 Rh2'
_cell_volume   72.3
_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
  Gd  Gd0  1  0.31  0.31  0.31  1.0
  Mg  Mg1  1  0.0  0.0  0.0  1.0
  Rh  Rh2  1  0.65  0.65  0.65  1.0
  Rh  Rh3  1  0.96  0.96  0.96  1.0

data_GdMgRh2
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.68
_cell_length_b   4.68
_cell_length_c   11.45
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   GdMgRh2
_chemical_formula_sum   'Gd3 Mg3 Rh6'
_cell_volume   216.91
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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
  Gd  Gd0  3  0.0  0.0  0.69  1.0
  Mg  Mg1  3  0.0  0.0  0.0  1.0
  Rh  Rh2  3  0.0  0.0  0.04  1.0
  Rh  Rh3  3  0.0  0.0  0.35  1.0

Gd Mg Rh Rh
MgGdRh2 crystallizes in the trigonal R3m space group. Mg(1) is bonded in a single-bond geometry to four equivalent Gd(1), one Rh(2), and three equivalent Rh(1) atoms. There are three shorter (2.72 Å) and one longer (3.51 Å) Mg(1)-Gd(1) bond length. The Mg(1)-Rh(2) bond length is 0.46 Å. All Mg(1)-Rh(1) bond lengths are 2.70 Å. Gd(1) is bonded in a 11-coordinate geometry to four equivalent Mg(1), three equivalent Rh(2), and four equivalent Rh(1) atoms. All Gd(1)-Rh(2) bond lengths are 2.70 Å. There are three shorter (2.70 Å) and one longer (3.97 Å) Gd(1)-Rh(1) bond length. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a 6-coordinate geometry to three equivalent Mg(1) and four equivalent Gd(1) atoms. In the second Rh site, Rh(2) is bonded in a single-bond geometry to one Mg(1) and three equivalent Gd(1) atoms.