data_SrY2Al
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.23
_cell_length_b   11.23
_cell_length_c   11.23
_cell_angle_alpha   19.1
_cell_angle_beta   19.1
_cell_angle_gamma   19.1
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrY2Al
_chemical_formula_sum   'Sr1 Y2 Al1'
_cell_volume   132.67
_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  0.0  0.0  0.54  1.0
  Y  Y2  1  0.0  0.0  0.2  1.0
  Y  Y3  1  0.0  0.0  0.87  1.0
  Al  Al0  1  0.0  0.0  0.0  1.0

data_SrY2Al
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.46
_cell_length_b   3.73
_cell_length_c   11.23
_cell_angle_alpha   90.0
_cell_angle_beta   101.05
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   SrY2Al
_chemical_formula_sum   'Sr2 Y4 Al2'
_cell_volume   265.34
_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  0.0  0.0  0.46  1.0
  Y  Y1  2  0.0  0.0  0.13  1.0
  Y  Y2  2  0.0  0.0  0.8  1.0
  Al  Al3  2  0.0  0.0  0.0  1.0

Sr Y Y Al
SrY2Al crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to six Sr(1,1); one Y(1); and one Y(2) atom to form a mixture of distorted corner and edge-sharing SrSr6Y2 hexagonal bipyramids. All Sr(1)-Sr(1,1) bond lengths are 3.73 Å. The Sr(1)-Y(1) bond length is 3.74 Å. The Sr(1)-Y(2) bond length is 3.74 Å. In the second Sr site, Sr(1) is bonded to six Sr(1,1); one Y(1); and one Y(2) atom to form a mixture of distorted corner and edge-sharing SrSr6Y2 hexagonal bipyramids. Both Sr(1)-Sr(1) bond lengths are 3.73 Å. The Sr(1)-Y(1) bond length is 3.74 Å. The Sr(1)-Y(2) bond length is 3.74 Å. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a distorted single-bond geometry to one Sr(1) and one Al(1) atom. The Y(1)-Al(1) bond length is 2.30 Å. In the second Y site, Y(2) is bonded in a single-bond geometry to one Sr(1) and one Al(1) atom. The Y(2)-Al(1) bond length is 1.46 Å. Al(1) is bonded in a linear geometry to one Y(1) and one Y(2) atom.