data_PmMg2Sc
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.23
_cell_length_b   5.23
_cell_length_c   5.23
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   PmMg2Sc
_chemical_formula_sum   'Pm1 Mg2 Sc1'
_cell_volume   100.97
_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
  Pm  Pm2  1  0.7  0.7  0.7  1.0
  Mg  Mg0  1  0.54  0.54  0.54  1.0
  Mg  Mg1  1  0.85  0.85  0.85  1.0
  Sc  Sc3  1  0.0  0.0  0.0  1.0

data_PmMg2Sc
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.23
_cell_length_b   5.23
_cell_length_c   12.8
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   PmMg2Sc
_chemical_formula_sum   'Pm3 Mg6 Sc3'
_cell_volume   302.91
_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
  Pm  Pm0  3  0.0  0.0  0.3  1.0
  Mg  Mg1  3  0.0  0.0  0.15  1.0
  Mg  Mg2  3  0.0  0.0  0.46  1.0
  Sc  Sc3  3  0.0  0.0  0.0  1.0

Pm Mg Mg Sc
Mg2PmSc crystallizes in the trigonal R3m space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a single-bond geometry to one Pm(1) atom. The Mg(1)-Pm(1) bond length is 1.95 Å. In the second Mg site, Mg(2) is bonded in a distorted linear geometry to one Pm(1) and one Sc(1) atom. The Mg(2)-Pm(1) bond length is 1.95 Å. The Mg(2)-Sc(1) bond length is 1.95 Å. Pm(1) is bonded in a distorted linear geometry to one Mg(1), one Mg(2), and three equivalent Sc(1) atoms. All Pm(1)-Sc(1) bond lengths are 3.04 Å. Sc(1) is bonded to one Mg(2) and three equivalent Pm(1) atoms to form distorted corner-sharing ScPm3Mg trigonal pyramids.