data_SrY2Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.06
_cell_length_b   5.06
_cell_length_c   5.31
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrY2Mg
_chemical_formula_sum   'Sr1 Y2 Mg1'
_cell_volume   135.84
_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
  Sr  Sr1  1  0.53  0.53  0.0  1.0
  Y  Y2  1  0.53  0.0  0.65  1.0
  Y  Y3  1  0.0  0.53  0.65  1.0
  Mg  Mg0  1  0.0  0.0  0.0  1.0

data_SrY2Mg
_symmetry_space_group_name_H-M   Cm
_cell_length_a   7.16
_cell_length_b   7.16
_cell_length_c   5.31
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   SrY2Mg
_chemical_formula_sum   'Sr2 Y4 Mg2'
_cell_volume   271.69
_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
  Sr  Sr0  2  0.03  0.5  0.0  1.0
  Y  Y1  4  0.26  0.26  0.65  1.0
  Mg  Mg2  2  0.0  0.0  0.0  1.0

Sr Y Y Mg
Sr Y Y Mg 0 2 o o - 0 2 + o - 0 3 o + o 0 3 + o o 0 3 + + o 0 1 o o - 0 1 o + - 1 2 o - o 1 2 + - o 1 2 + o o 1 3 o o + 1 3 + o + 2 3 o o + 2 3 o + + 
SrMgY2 crystallizes in the monoclinic Cm space group. Sr(1) is bonded in a 12-coordinate geometry to four equivalent Mg(1) and eight equivalent Y(1) atoms. There are a spread of Sr(1)-Mg(1) bond distances ranging from 3.36-3.79 Å. There are a spread of Sr(1)-Y(1) bond distances ranging from 3.01-4.38 Å. Mg(1) is bonded in a 8-coordinate geometry to four equivalent Sr(1) and four equivalent Y(1) atoms. There are two shorter (3.01 Å) and two longer (3.25 Å) Mg(1)-Y(1) bond lengths. Y(1) is bonded in a 4-coordinate geometry to four equivalent Sr(1) and two equivalent Mg(1) atoms.