The crystal structure described by LaSrAl3O7 crystallizes in the orthorhombic Cmm2 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(3), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. La(1) is bonded in a 8-coordinate geometry to one O(4), one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(3), one O(6), and two equivalent O(1) atoms to form corner-sharing AlO4 tetrahedra. In the second Al site, Al(2) is bonded to one O(4), one O(5), and two equivalent O(2) atoms to form corner-sharing AlO4 tetrahedra. In the third Al site, Al(3) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form corner-sharing AlO4 tetrahedra. There are six inequivalent O sites. In the first O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Al(2) atoms. In the second O site, O(6) is bonded to two equivalent La(1) and two equivalent Al(1) atoms to form distorted OLa2Al2 tetrahedra that share corners with two equivalent O(4)Sr2LaAl tetrahedra, corners with two equivalent O(3)SrLa2Al tetrahedra, and edges with two equivalent O(3)SrLa2Al tetrahedra. In the third O site, O(1) is bonded in a 2-coordinate geometry to one Sr(1), one La(1), one Al(1), and one Al(3) atom. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one La(1), one Al(2), and one Al(3) atom. In the fifth O site, O(3) is bonded to one Sr(1), two equivalent La(1), and one Al(1) atom to form distorted OSrLa2Al tetrahedra that share  a cornercorner with one O(6)La2Al2 tetrahedra, corners with four equivalent O(4)Sr2LaAl tetrahedra,  an edgeedge with one O(6)La2Al2 tetrahedra, and  an edgeedge with one O(3)SrLa2Al tetrahedra. In the sixth O site, O(4) is bonded to two equivalent Sr(1), one La(1), and one Al(2) atom to form distorted OSr2LaAl tetrahedra that share  a cornercorner with one O(6)La2Al2 tetrahedra, corners with four equivalent O(3)SrLa2Al tetrahedra, and  an edgeedge with one O(4)Sr2LaAl tetrahedra. is represented by the CIF file [CIF]
data_SrLaAl3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.956
_cell_length_b   7.956
_cell_length_c   5.288
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.169
_symmetry_Int_Tables_number   1
_cell_volume   334.724
_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  0.662  0.662  0.490  1.0
  Sr  Sr1  1  0.338  0.338  0.490  1.0
  La  La2  1  0.836  0.164  0.510  1.0
  La  La3  1  0.164  0.836  0.510  1.0
  Al  Al4  1  0.858  0.858  0.039  1.0
  Al  Al5  1  0.643  0.357  0.962  1.0
  Al  Al6  1  0.142  0.142  0.039  1.0
  Al  Al7  1  0.357  0.643  0.962  1.0
  Al  Al8  1  0.500  0.000  1.000  1.0
  Al  Al9  1  0.000  0.500  1.000  1.0
  O  O10  1  0.666  0.918  0.187  1.0
  O  O11  1  0.838  0.410  0.809  1.0
  O  O12  1  0.334  0.082  0.187  1.0
  O  O13  1  0.162  0.590  0.809  1.0
  O  O14  1  0.410  0.838  0.809  1.0
  O  O15  1  0.082  0.334  0.187  1.0
  O  O16  1  0.590  0.162  0.809  1.0
  O  O17  1  0.918  0.666  0.187  1.0
  O  O18  1  0.868  0.868  0.707  1.0
  O  O19  1  0.651  0.349  0.292  1.0
  O  O20  1  0.132  0.132  0.707  1.0
  O  O21  1  0.349  0.651  0.292  1.0
  O  O22  1  0.500  0.500  0.833  1.0
  O  O23  1  0.000  0.000  0.188  1.0
[/CIF]
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The crystal structure described by LaSrAl3O7 crystallizes in the orthorhombic Cmm2 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(3), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. La(1) is bonded in a 8-coordinate geometry to one O(4), one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(3), one O(6), and two equivalent O(1) atoms to form corner-sharing AlO4 tetrahedra. In the second Al site, Al(2) is bonded to one O(4), one O(5), and two equivalent O(2) atoms to form corner-sharing AlO4 tetrahedra. In the third Al site, Al(3) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form corner-sharing AlO4 tetrahedra. There are six inequivalent O sites. In the first O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Al(2) atoms. In the second O site, O(6) is bonded to two equivalent La(1) and two equivalent Al(1) atoms to form distorted OLa2Al2 tetrahedra that share corners with two equivalent O(4)Sr2LaAl tetrahedra, corners with two equivalent O(3)SrLa2Al tetrahedra, and edges with two equivalent O(3)SrLa2Al tetrahedra. In the third O site, O(1) is bonded in a 2-coordinate geometry to one Sr(1), one La(1), one Al(1), and one Al(3) atom. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one La(1), one Al(2), and one Al(3) atom. In the fifth O site, O(3) is bonded to one Sr(1), two equivalent La(1), and one Al(1) atom to form distorted OSrLa2Al tetrahedra that share  a cornercorner with one O(6)La2Al2 tetrahedra, corners with four equivalent O(4)Sr2LaAl tetrahedra,  an edgeedge with one O(6)La2Al2 tetrahedra, and  an edgeedge with one O(3)SrLa2Al tetrahedra. In the sixth O site, O(4) is bonded to two equivalent Sr(1), one La(1), and one Al(2) atom to form distorted OSr2LaAl tetrahedra that share  a cornercorner with one O(6)La2Al2 tetrahedra, corners with four equivalent O(3)SrLa2Al tetrahedra, and  an edgeedge with one O(4)Sr2LaAl tetrahedra. is represented by the CIF file [CIF]
data_SrLaAl3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.956
_cell_length_b   7.956
_cell_length_c   5.288
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.169
_symmetry_Int_Tables_number   1
_cell_volume   334.724
_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  0.662  0.662  0.490  1.0
  Sr  Sr1  1  0.338  0.338  0.490  1.0
  La  La2  1  0.836  0.164  0.510  1.0
  La  La3  1  0.164  0.836  0.510  1.0
  Al  Al4  1  0.858  0.858  0.039  1.0
  Al  Al5  1  0.643  0.357  0.962  1.0
  Al  Al6  1  0.142  0.142  0.039  1.0
  Al  Al7  1  0.357  0.643  0.962  1.0
  Al  Al8  1  0.500  0.000  1.000  1.0
  Al  Al9  1  0.000  0.500  1.000  1.0
  O  O10  1  0.666  0.918  0.187  1.0
  O  O11  1  0.838  0.410  0.809  1.0
  O  O12  1  0.334  0.082  0.187  1.0
  O  O13  1  0.162  0.590  0.809  1.0
  O  O14  1  0.410  0.838  0.809  1.0
  O  O15  1  0.082  0.334  0.187  1.0
  O  O16  1  0.590  0.162  0.809  1.0
  O  O17  1  0.918  0.666  0.187  1.0
  O  O18  1  0.868  0.868  0.707  1.0
  O  O19  1  0.651  0.349  0.292  1.0
  O  O20  1  0.132  0.132  0.707  1.0
  O  O21  1  0.349  0.651  0.292  1.0
  O  O22  1  0.500  0.500  0.833  1.0
  O  O23  1  0.000  0.000  0.188  1.0
[/CIF]
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