The material described by Sr2YMn2AlO7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), two equivalent O(2), and three equivalent O(4) atoms. Y(1) is bonded in a 4-coordinate geometry to two equivalent O(3) and four equivalent O(2) atoms. Mn(1) is bonded to one O(4), two equivalent O(2), and two equivalent O(3) atoms to form MnO5 square pyramids that share corners with four equivalent Mn(1)O5 square pyramids and  a cornercorner with one Al(1)O4 tetrahedra. Al(1) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form AlO4 tetrahedra that share corners with two equivalent Mn(1)O5 square pyramids and corners with two equivalent Al(1)O4 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 Mn(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 corner-sharing OSr2Al2 tetrahedra. In the third O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Y(1), and two equivalent Mn(1) atoms. In the fourth O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Y(1), and two equivalent Mn(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2YMn2AlO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.812
_cell_length_b   11.812
_cell_length_c   11.812
_cell_angle_alpha   152.052
_cell_angle_beta   150.942
_cell_angle_gamma   40.756
_symmetry_Int_Tables_number   1
_cell_volume   374.382
_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  0.814  0.834  0.960  1.0
  Sr  Sr1  1  0.186  0.145  0.020  1.0
  Sr  Sr2  1  0.626  0.645  0.960  1.0
  Sr  Sr3  1  0.374  0.334  0.020  1.0
  Y  Y4  1  0.500  0.489  0.989  1.0
  Y  Y5  1  0.000  0.989  0.989  1.0
  Mn  Mn6  1  0.920  0.398  0.486  1.0
  Mn  Mn7  1  0.080  0.566  0.478  1.0
  Mn  Mn8  1  0.588  0.066  0.486  1.0
  Mn  Mn9  1  0.412  0.898  0.478  1.0
  Al  Al10  1  0.169  0.759  0.428  1.0
  Al  Al11  1  0.831  0.259  0.589  1.0
  O  O12  1  0.927  0.562  0.990  1.0
  O  O13  1  0.073  0.062  0.635  1.0
  O  O14  1  0.733  0.710  0.574  1.0
  O  O15  1  0.267  0.840  0.976  1.0
  O  O16  1  0.364  0.340  0.574  1.0
  O  O17  1  0.636  0.210  0.976  1.0
  O  O18  1  0.122  0.103  0.370  1.0
  O  O19  1  0.878  0.248  0.982  1.0
  O  O20  1  0.766  0.748  0.370  1.0
  O  O21  1  0.234  0.603  0.982  1.0
  O  O22  1  0.381  0.781  0.525  1.0
  O  O23  1  0.619  0.144  0.400  1.0
  O  O24  1  0.244  0.644  0.525  1.0
  O  O25  1  0.756  0.281  0.400  1.0
[/CIF]
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The material described by Sr2YMn2AlO7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), two equivalent O(2), and three equivalent O(4) atoms. Y(1) is bonded in a 4-coordinate geometry to two equivalent O(3) and four equivalent O(2) atoms. Mn(1) is bonded to one O(4), two equivalent O(2), and two equivalent O(3) atoms to form MnO5 square pyramids that share corners with four equivalent Mn(1)O5 square pyramids and  a cornercorner with one Al(1)O4 tetrahedra. Al(1) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form AlO4 tetrahedra that share corners with two equivalent Mn(1)O5 square pyramids and corners with two equivalent Al(1)O4 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 Mn(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 corner-sharing OSr2Al2 tetrahedra. In the third O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Y(1), and two equivalent Mn(1) atoms. In the fourth O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Y(1), and two equivalent Mn(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2YMn2AlO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.812
_cell_length_b   11.812
_cell_length_c   11.812
_cell_angle_alpha   152.052
_cell_angle_beta   150.942
_cell_angle_gamma   40.756
_symmetry_Int_Tables_number   1
_cell_volume   374.382
_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  0.814  0.834  0.960  1.0
  Sr  Sr1  1  0.186  0.145  0.020  1.0
  Sr  Sr2  1  0.626  0.645  0.960  1.0
  Sr  Sr3  1  0.374  0.334  0.020  1.0
  Y  Y4  1  0.500  0.489  0.989  1.0
  Y  Y5  1  0.000  0.989  0.989  1.0
  Mn  Mn6  1  0.920  0.398  0.486  1.0
  Mn  Mn7  1  0.080  0.566  0.478  1.0
  Mn  Mn8  1  0.588  0.066  0.486  1.0
  Mn  Mn9  1  0.412  0.898  0.478  1.0
  Al  Al10  1  0.169  0.759  0.428  1.0
  Al  Al11  1  0.831  0.259  0.589  1.0
  O  O12  1  0.927  0.562  0.990  1.0
  O  O13  1  0.073  0.062  0.635  1.0
  O  O14  1  0.733  0.710  0.574  1.0
  O  O15  1  0.267  0.840  0.976  1.0
  O  O16  1  0.364  0.340  0.574  1.0
  O  O17  1  0.636  0.210  0.976  1.0
  O  O18  1  0.122  0.103  0.370  1.0
  O  O19  1  0.878  0.248  0.982  1.0
  O  O20  1  0.766  0.748  0.370  1.0
  O  O21  1  0.234  0.603  0.982  1.0
  O  O22  1  0.381  0.781  0.525  1.0
  O  O23  1  0.619  0.144  0.400  1.0
  O  O24  1  0.244  0.644  0.525  1.0
  O  O25  1  0.756  0.281  0.400  1.0
[/CIF]
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