The structure described by SrO2 crystallizes in the orthorhombic Pnma space group. Sr(1) is bonded to four equivalent O(1) and four equivalent O(2) atoms to form distorted SrO8 hexagonal bipyramids that share corners with four equivalent Sr(1)O8 hexagonal bipyramids, corners with four equivalent O(1)Sr4O square pyramids, edges with six equivalent Sr(1)O8 hexagonal bipyramids, and faces with two equivalent Sr(1)O8 hexagonal bipyramids. There are two inequivalent O sites. In the first O site, O(2) is bonded in a 5-coordinate geometry to four equivalent Sr(1) and one O(1) atom. In the second O site, O(1) is bonded to four equivalent Sr(1) and one O(2) atom to form distorted OSr4O square pyramids that share corners with four equivalent Sr(1)O8 hexagonal bipyramids, corners with eight equivalent O(1)Sr4O square pyramids, and edges with two equivalent O(1)Sr4O square pyramids. is represented by the CIF file [CIF]
data_SrO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.724
_cell_length_b   4.947
_cell_length_c   8.511
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   198.911
_cell_formula_units_Z   4
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  0.891  0.750  0.147  1.0
  Sr  Sr1  1  0.609  0.750  0.647  1.0
  Sr  Sr2  1  0.109  0.250  0.853  1.0
  Sr  Sr3  1  0.391  0.250  0.353  1.0
  O  O4  1  0.534  0.750  0.355  1.0
  O  O5  1  0.966  0.750  0.855  1.0
  O  O6  1  0.466  0.250  0.645  1.0
  O  O7  1  0.034  0.250  0.145  1.0
  O  O8  1  0.223  0.750  0.395  1.0
  O  O9  1  0.277  0.750  0.895  1.0
  O  O10  1  0.777  0.250  0.605  1.0
  O  O11  1  0.723  0.250  0.105  1.0
[/CIF]
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The structure described by SrO2 crystallizes in the orthorhombic Pnma space group. Sr(1) is bonded to four equivalent O(1) and four equivalent O(2) atoms to form distorted SrO8 hexagonal bipyramids that share corners with four equivalent Sr(1)O8 hexagonal bipyramids, corners with four equivalent O(1)Sr4O square pyramids, edges with six equivalent Sr(1)O8 hexagonal bipyramids, and faces with two equivalent Sr(1)O8 hexagonal bipyramids. There are two inequivalent O sites. In the first O site, O(2) is bonded in a 5-coordinate geometry to four equivalent Sr(1) and one O(1) atom. In the second O site, O(1) is bonded to four equivalent Sr(1) and one O(2) atom to form distorted OSr4O square pyramids that share corners with four equivalent Sr(1)O8 hexagonal bipyramids, corners with eight equivalent O(1)Sr4O square pyramids, and edges with two equivalent O(1)Sr4O square pyramids. is represented by the CIF file [CIF]
data_SrO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.724
_cell_length_b   4.947
_cell_length_c   8.511
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   198.911
_cell_formula_units_Z   4
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  0.891  0.750  0.147  1.0
  Sr  Sr1  1  0.609  0.750  0.647  1.0
  Sr  Sr2  1  0.109  0.250  0.853  1.0
  Sr  Sr3  1  0.391  0.250  0.353  1.0
  O  O4  1  0.534  0.750  0.355  1.0
  O  O5  1  0.966  0.750  0.855  1.0
  O  O6  1  0.466  0.250  0.645  1.0
  O  O7  1  0.034  0.250  0.145  1.0
  O  O8  1  0.223  0.750  0.395  1.0
  O  O9  1  0.277  0.750  0.895  1.0
  O  O10  1  0.777  0.250  0.605  1.0
  O  O11  1  0.723  0.250  0.105  1.0
[/CIF]
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