The structure described by Sr2YTi2AlO7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and three equivalent O(4) atoms. Y(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. Ti(1) is bonded in a distorted rectangular see-saw-like geometry to one O(4), two equivalent O(2), and two equivalent O(3) atoms. Al(1) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form corner-sharing AlO4 tetrahedra. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one Ti(1), and one Al(1) atom. In the second O site, O(1) is bonded to two equivalent Sr(1) and two equivalent Al(1) atoms to form distorted OSr2Al2 tetrahedra that share corners with four equivalent O(2)Sr2Y2Ti2 octahedra, corners with four equivalent O(3)Sr2Y2Ti2 octahedra, and corners with two equivalent O(1)Sr2Al2 tetrahedra. The corner-sharing octahedral tilt angles range from 10-80°. In the third O site, O(2) is bonded to two equivalent Sr(1), two equivalent Y(1), and two equivalent Ti(1) atoms to form distorted OSr2Y2Ti2 octahedra that share corners with four equivalent O(2)Sr2Y2Ti2 octahedra, corners with four equivalent O(3)Sr2Y2Ti2 octahedra, corners with two equivalent O(1)Sr2Al2 tetrahedra, edges with three equivalent O(3)Sr2Y2Ti2 octahedra, faces with two equivalent O(2)Sr2Y2Ti2 octahedra, and faces with two equivalent O(3)Sr2Y2Ti2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°. In the fourth O site, O(3) is bonded to two equivalent Sr(1), two equivalent Y(1), and two equivalent Ti(1) atoms to form distorted OSr2Y2Ti2 octahedra that share corners with four equivalent O(2)Sr2Y2Ti2 octahedra, corners with four equivalent O(3)Sr2Y2Ti2 octahedra, corners with two equivalent O(1)Sr2Al2 tetrahedra, edges with three equivalent O(2)Sr2Y2Ti2 octahedra, faces with two equivalent O(2)Sr2Y2Ti2 octahedra, and faces with two equivalent O(3)Sr2Y2Ti2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°. is represented by the CIF file [CIF]
data_Sr2YTi2AlO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.128
_cell_length_b   12.128
_cell_length_c   12.128
_cell_angle_alpha   153.710
_cell_angle_beta   153.012
_cell_angle_gamma   38.032
_symmetry_Int_Tables_number   1
_cell_volume   358.006
_cell_formula_units_Z   2
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  Sr0  1  0.819  0.831  0.964  1.0
  Sr  Sr1  1  0.181  0.145  0.012  1.0
  Sr  Sr2  1  0.633  0.645  0.964  1.0
  Sr  Sr3  1  0.367  0.331  0.012  1.0
  Y  Y4  1  0.500  0.482  0.982  1.0
  Y  Y5  1  0.000  0.982  0.982  1.0
  Ti  Ti6  1  0.939  0.420  0.483  1.0
  Ti  Ti7  1  0.061  0.544  0.481  1.0
  Ti  Ti8  1  0.563  0.044  0.483  1.0
  Ti  Ti9  1  0.437  0.920  0.481  1.0
  Al  Al10  1  0.177  0.755  0.432  1.0
  Al  Al11  1  0.823  0.255  0.578  1.0
  O  O12  1  0.909  0.573  0.982  1.0
  O  O13  1  0.091  0.073  0.664  1.0
  O  O14  1  0.688  0.670  0.493  1.0
  O  O15  1  0.312  0.805  0.982  1.0
  O  O16  1  0.323  0.305  0.493  1.0
  O  O17  1  0.677  0.170  0.982  1.0
  O  O18  1  0.176  0.158  0.474  1.0
  O  O19  1  0.824  0.297  0.982  1.0
  O  O20  1  0.816  0.797  0.474  1.0
  O  O21  1  0.184  0.658  0.982  1.0
  O  O22  1  0.378  0.768  0.510  1.0
  O  O23  1  0.622  0.132  0.390  1.0
  O  O24  1  0.242  0.632  0.510  1.0
  O  O25  1  0.758  0.268  0.390  1.0
[/CIF]
.
The structure described by Sr2YTi2AlO7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and three equivalent O(4) atoms. Y(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. Ti(1) is bonded in a distorted rectangular see-saw-like geometry to one O(4), two equivalent O(2), and two equivalent O(3) atoms. Al(1) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form corner-sharing AlO4 tetrahedra. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one Ti(1), and one Al(1) atom. In the second O site, O(1) is bonded to two equivalent Sr(1) and two equivalent Al(1) atoms to form distorted OSr2Al2 tetrahedra that share corners with four equivalent O(2)Sr2Y2Ti2 octahedra, corners with four equivalent O(3)Sr2Y2Ti2 octahedra, and corners with two equivalent O(1)Sr2Al2 tetrahedra. The corner-sharing octahedral tilt angles range from 10-80°. In the third O site, O(2) is bonded to two equivalent Sr(1), two equivalent Y(1), and two equivalent Ti(1) atoms to form distorted OSr2Y2Ti2 octahedra that share corners with four equivalent O(2)Sr2Y2Ti2 octahedra, corners with four equivalent O(3)Sr2Y2Ti2 octahedra, corners with two equivalent O(1)Sr2Al2 tetrahedra, edges with three equivalent O(3)Sr2Y2Ti2 octahedra, faces with two equivalent O(2)Sr2Y2Ti2 octahedra, and faces with two equivalent O(3)Sr2Y2Ti2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°. In the fourth O site, O(3) is bonded to two equivalent Sr(1), two equivalent Y(1), and two equivalent Ti(1) atoms to form distorted OSr2Y2Ti2 octahedra that share corners with four equivalent O(2)Sr2Y2Ti2 octahedra, corners with four equivalent O(3)Sr2Y2Ti2 octahedra, corners with two equivalent O(1)Sr2Al2 tetrahedra, edges with three equivalent O(2)Sr2Y2Ti2 octahedra, faces with two equivalent O(2)Sr2Y2Ti2 octahedra, and faces with two equivalent O(3)Sr2Y2Ti2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°. is represented by the CIF file [CIF]
data_Sr2YTi2AlO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.128
_cell_length_b   12.128
_cell_length_c   12.128
_cell_angle_alpha   153.710
_cell_angle_beta   153.012
_cell_angle_gamma   38.032
_symmetry_Int_Tables_number   1
_cell_volume   358.006
_cell_formula_units_Z   2
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  Sr0  1  0.819  0.831  0.964  1.0
  Sr  Sr1  1  0.181  0.145  0.012  1.0
  Sr  Sr2  1  0.633  0.645  0.964  1.0
  Sr  Sr3  1  0.367  0.331  0.012  1.0
  Y  Y4  1  0.500  0.482  0.982  1.0
  Y  Y5  1  0.000  0.982  0.982  1.0
  Ti  Ti6  1  0.939  0.420  0.483  1.0
  Ti  Ti7  1  0.061  0.544  0.481  1.0
  Ti  Ti8  1  0.563  0.044  0.483  1.0
  Ti  Ti9  1  0.437  0.920  0.481  1.0
  Al  Al10  1  0.177  0.755  0.432  1.0
  Al  Al11  1  0.823  0.255  0.578  1.0
  O  O12  1  0.909  0.573  0.982  1.0
  O  O13  1  0.091  0.073  0.664  1.0
  O  O14  1  0.688  0.670  0.493  1.0
  O  O15  1  0.312  0.805  0.982  1.0
  O  O16  1  0.323  0.305  0.493  1.0
  O  O17  1  0.677  0.170  0.982  1.0
  O  O18  1  0.176  0.158  0.474  1.0
  O  O19  1  0.824  0.297  0.982  1.0
  O  O20  1  0.816  0.797  0.474  1.0
  O  O21  1  0.184  0.658  0.982  1.0
  O  O22  1  0.378  0.768  0.510  1.0
  O  O23  1  0.622  0.132  0.390  1.0
  O  O24  1  0.242  0.632  0.510  1.0
  O  O25  1  0.758  0.268  0.390  1.0
[/CIF]
.