The material described by SrEu4O5 is Caswellsilverite-like structured and crystallizes in the tetragonal I4/m space group. Sr(1) is bonded to two equivalent O(1) and four O(2,2) atoms to form SrO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra, corners with four equivalent Eu(1)O6 octahedra, and edges with twelve equivalent Eu(1)O6 octahedra. The corner-sharing octahedra are not tilted. Eu(1) is bonded to one O(1) and five O(2,2) atoms to form EuO6 octahedra that share  a cornercorner with one Sr(1)O6 octahedra, corners with five equivalent Eu(1)O6 octahedra, edges with three equivalent Sr(1)O6 octahedra, and edges with nine equivalent Eu(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1) and four equivalent Eu(1) atoms to form OSr2Eu4 octahedra that share corners with two equivalent O(1)Sr2Eu4 octahedra; corners with four O(2,2,2)SrEu5 octahedra; and edges with twelve O(2,2,2)SrEu5 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second O site, O(2) is bonded to one Sr(1) and five equivalent Eu(1) atoms to form OSrEu5 octahedra that share  a cornercorner with one O(1)Sr2Eu4 octahedra; corners with five O(2,2,2)SrEu5 octahedra; edges with three equivalent O(1)Sr2Eu4 octahedra; and edges with nine O(2,2,2)SrEu5 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the third O site, O(2) is bonded to one Sr(1) and five equivalent Eu(1) atoms to form OSrEu5 octahedra that share  a cornercorner with one O(1)Sr2Eu4 octahedra; corners with five O(2,2)SrEu5 octahedra; edges with three equivalent O(1)Sr2Eu4 octahedra; and edges with nine O(2,2,2)SrEu5 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the fourth O site, O(2) is bonded to one Sr(1) and five equivalent Eu(1) atoms to form OSrEu5 octahedra that share  a cornercorner with one O(1)Sr2Eu4 octahedra; corners with five O(2,2,2)SrEu5 octahedra; edges with three equivalent O(1)Sr2Eu4 octahedra; and edges with nine O(2,2)SrEu5 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. is represented by the CIF file [CIF]
data_SrEu4O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.226
_cell_length_b   6.226
_cell_length_c   6.226
_cell_angle_alpha   99.589
_cell_angle_beta   99.593
_cell_angle_gamma   131.817
_symmetry_Int_Tables_number   1
_cell_volume   164.167
_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  Sr0  1  1.000  0.000  0.000  1.0
  Eu  Eu1  1  0.801  0.600  0.401  1.0
  Eu  Eu2  1  0.400  0.801  0.201  1.0
  Eu  Eu3  1  0.600  0.199  0.799  1.0
  Eu  Eu4  1  0.199  0.400  0.599  1.0
  O  O5  1  0.500  0.500  0.000  1.0
  O  O6  1  0.303  0.102  0.405  1.0
  O  O7  1  0.898  0.303  0.202  1.0
  O  O8  1  0.102  0.697  0.798  1.0
  O  O9  1  0.697  0.898  0.595  1.0
[/CIF]
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The material described by SrEu4O5 is Caswellsilverite-like structured and crystallizes in the tetragonal I4/m space group. Sr(1) is bonded to two equivalent O(1) and four O(2,2) atoms to form SrO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra, corners with four equivalent Eu(1)O6 octahedra, and edges with twelve equivalent Eu(1)O6 octahedra. The corner-sharing octahedra are not tilted. Eu(1) is bonded to one O(1) and five O(2,2) atoms to form EuO6 octahedra that share  a cornercorner with one Sr(1)O6 octahedra, corners with five equivalent Eu(1)O6 octahedra, edges with three equivalent Sr(1)O6 octahedra, and edges with nine equivalent Eu(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1) and four equivalent Eu(1) atoms to form OSr2Eu4 octahedra that share corners with two equivalent O(1)Sr2Eu4 octahedra; corners with four O(2,2,2)SrEu5 octahedra; and edges with twelve O(2,2,2)SrEu5 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second O site, O(2) is bonded to one Sr(1) and five equivalent Eu(1) atoms to form OSrEu5 octahedra that share  a cornercorner with one O(1)Sr2Eu4 octahedra; corners with five O(2,2,2)SrEu5 octahedra; edges with three equivalent O(1)Sr2Eu4 octahedra; and edges with nine O(2,2,2)SrEu5 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the third O site, O(2) is bonded to one Sr(1) and five equivalent Eu(1) atoms to form OSrEu5 octahedra that share  a cornercorner with one O(1)Sr2Eu4 octahedra; corners with five O(2,2)SrEu5 octahedra; edges with three equivalent O(1)Sr2Eu4 octahedra; and edges with nine O(2,2,2)SrEu5 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the fourth O site, O(2) is bonded to one Sr(1) and five equivalent Eu(1) atoms to form OSrEu5 octahedra that share  a cornercorner with one O(1)Sr2Eu4 octahedra; corners with five O(2,2,2)SrEu5 octahedra; edges with three equivalent O(1)Sr2Eu4 octahedra; and edges with nine O(2,2)SrEu5 octahedra. The corner-sharing octahedral tilt angles range from 0-1°. is represented by the CIF file [CIF]
data_SrEu4O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.226
_cell_length_b   6.226
_cell_length_c   6.226
_cell_angle_alpha   99.589
_cell_angle_beta   99.593
_cell_angle_gamma   131.817
_symmetry_Int_Tables_number   1
_cell_volume   164.167
_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  Sr0  1  1.000  0.000  0.000  1.0
  Eu  Eu1  1  0.801  0.600  0.401  1.0
  Eu  Eu2  1  0.400  0.801  0.201  1.0
  Eu  Eu3  1  0.600  0.199  0.799  1.0
  Eu  Eu4  1  0.199  0.400  0.599  1.0
  O  O5  1  0.500  0.500  0.000  1.0
  O  O6  1  0.303  0.102  0.405  1.0
  O  O7  1  0.898  0.303  0.202  1.0
  O  O8  1  0.102  0.697  0.798  1.0
  O  O9  1  0.697  0.898  0.595  1.0
[/CIF]
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