The material described by Sr3Eu is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to four equivalent Sr(1), four equivalent Sr(2), and four equivalent Eu(1) atoms to form SrSr8Eu4 cuboctahedra that share corners with twelve equivalent Sr(1)Sr8Eu4 cuboctahedra, edges with eight equivalent Sr(1)Sr8Eu4 cuboctahedra, edges with eight equivalent Sr(2)Sr8Eu4 cuboctahedra, edges with eight equivalent Eu(1)Sr12 cuboctahedra, faces with four equivalent Sr(2)Sr8Eu4 cuboctahedra, faces with four equivalent Eu(1)Sr12 cuboctahedra, and faces with ten equivalent Sr(1)Sr8Eu4 cuboctahedra. In the second Sr site, Sr(2) is bonded to eight equivalent Sr(1) and four equivalent Eu(1) atoms to form SrSr8Eu4 cuboctahedra that share corners with four equivalent Sr(2)Sr8Eu4 cuboctahedra, corners with eight equivalent Eu(1)Sr12 cuboctahedra, edges with eight equivalent Sr(2)Sr8Eu4 cuboctahedra, edges with sixteen equivalent Sr(1)Sr8Eu4 cuboctahedra, faces with four equivalent Sr(2)Sr8Eu4 cuboctahedra, faces with six equivalent Eu(1)Sr12 cuboctahedra, and faces with eight equivalent Sr(1)Sr8Eu4 cuboctahedra. Eu(1) is bonded to four equivalent Sr(2) and eight equivalent Sr(1) atoms to form EuSr12 cuboctahedra that share corners with four equivalent Eu(1)Sr12 cuboctahedra, corners with eight equivalent Sr(2)Sr8Eu4 cuboctahedra, edges with eight equivalent Eu(1)Sr12 cuboctahedra, edges with sixteen equivalent Sr(1)Sr8Eu4 cuboctahedra, faces with four equivalent Eu(1)Sr12 cuboctahedra, faces with six equivalent Sr(2)Sr8Eu4 cuboctahedra, and faces with eight equivalent Sr(1)Sr8Eu4 cuboctahedra. is represented by the CIF file [CIF]
data_Sr3Eu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.393
_cell_length_b   7.393
_cell_length_c   7.393
_cell_angle_alpha   131.710
_cell_angle_beta   131.710
_cell_angle_gamma   70.688
_symmetry_Int_Tables_number   1
_cell_volume   220.611
_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  0.750  0.250  0.500  1.0
  Sr  Sr1  1  0.250  0.750  0.500  1.0
  Sr  Sr2  1  0.500  0.500  0.000  1.0
  Eu  Eu3  1  0.000  0.000  0.000  1.0
[/CIF]
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The material described by Sr3Eu is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to four equivalent Sr(1), four equivalent Sr(2), and four equivalent Eu(1) atoms to form SrSr8Eu4 cuboctahedra that share corners with twelve equivalent Sr(1)Sr8Eu4 cuboctahedra, edges with eight equivalent Sr(1)Sr8Eu4 cuboctahedra, edges with eight equivalent Sr(2)Sr8Eu4 cuboctahedra, edges with eight equivalent Eu(1)Sr12 cuboctahedra, faces with four equivalent Sr(2)Sr8Eu4 cuboctahedra, faces with four equivalent Eu(1)Sr12 cuboctahedra, and faces with ten equivalent Sr(1)Sr8Eu4 cuboctahedra. In the second Sr site, Sr(2) is bonded to eight equivalent Sr(1) and four equivalent Eu(1) atoms to form SrSr8Eu4 cuboctahedra that share corners with four equivalent Sr(2)Sr8Eu4 cuboctahedra, corners with eight equivalent Eu(1)Sr12 cuboctahedra, edges with eight equivalent Sr(2)Sr8Eu4 cuboctahedra, edges with sixteen equivalent Sr(1)Sr8Eu4 cuboctahedra, faces with four equivalent Sr(2)Sr8Eu4 cuboctahedra, faces with six equivalent Eu(1)Sr12 cuboctahedra, and faces with eight equivalent Sr(1)Sr8Eu4 cuboctahedra. Eu(1) is bonded to four equivalent Sr(2) and eight equivalent Sr(1) atoms to form EuSr12 cuboctahedra that share corners with four equivalent Eu(1)Sr12 cuboctahedra, corners with eight equivalent Sr(2)Sr8Eu4 cuboctahedra, edges with eight equivalent Eu(1)Sr12 cuboctahedra, edges with sixteen equivalent Sr(1)Sr8Eu4 cuboctahedra, faces with four equivalent Eu(1)Sr12 cuboctahedra, faces with six equivalent Sr(2)Sr8Eu4 cuboctahedra, and faces with eight equivalent Sr(1)Sr8Eu4 cuboctahedra. is represented by the CIF file [CIF]
data_Sr3Eu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.393
_cell_length_b   7.393
_cell_length_c   7.393
_cell_angle_alpha   131.710
_cell_angle_beta   131.710
_cell_angle_gamma   70.688
_symmetry_Int_Tables_number   1
_cell_volume   220.611
_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  0.750  0.250  0.500  1.0
  Sr  Sr1  1  0.250  0.750  0.500  1.0
  Sr  Sr2  1  0.500  0.500  0.000  1.0
  Eu  Eu3  1  0.000  0.000  0.000  1.0
[/CIF]
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