The material described by BaSr4 is alpha La-derived structured and crystallizes in the trigonal R-3m space group. Ba(1) is bonded to six equivalent Ba(1) and six equivalent Sr(1) atoms to form BaBa6Sr6 cuboctahedra that share corners with six equivalent Ba(1)Ba6Sr6 cuboctahedra, corners with six equivalent Sr(2)Sr12 cuboctahedra, edges with six equivalent Ba(1)Ba6Sr6 cuboctahedra, edges with six equivalent Sr(2)Sr12 cuboctahedra, edges with twelve equivalent Sr(1)Ba3Sr9 cuboctahedra, faces with six equivalent Ba(1)Ba6Sr6 cuboctahedra, and faces with twelve equivalent Sr(1)Ba3Sr9 cuboctahedra. There are six inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to three equivalent Ba(1), three equivalent Sr(2), and six equivalent Sr(1) atoms to form SrBa3Sr9 cuboctahedra that share corners with three equivalent Sr(2)Sr12 cuboctahedra; corners with nine equivalent Sr(1)Ba3Sr9 cuboctahedra; edges with six equivalent Ba(1)Ba6Sr6 cuboctahedra; edges with nine equivalent Sr(1)Ba3Sr9 cuboctahedra; edges with nine Sr(2,2)Sr12 cuboctahedra; faces with six equivalent Ba(1)Ba6Sr6 cuboctahedra; faces with six equivalent Sr(1)Ba3Sr9 cuboctahedra; and faces with six equivalent Sr(2)Sr12 cuboctahedra. In the second Sr site, Sr(2) is bonded to three equivalent Sr(1) and nine Sr(2,2) atoms to form SrSr12 cuboctahedra that share corners with three equivalent Ba(1)Ba6Sr6 cuboctahedra; corners with three equivalent Sr(1)Ba3Sr9 cuboctahedra; corners with six equivalent Sr(2)Sr12 cuboctahedra; edges with three equivalent Ba(1)Ba6Sr6 cuboctahedra; edges with nine equivalent Sr(1)Ba3Sr9 cuboctahedra; edges with twelve Sr(2,2)Sr12 cuboctahedra; faces with six equivalent Sr(1)Ba3Sr9 cuboctahedra; and faces with twelve Sr(2,2)Sr12 cuboctahedra. In the third Sr site, Sr(2) is bonded to three equivalent Sr(1) and nine Sr(2,2) atoms to form SrSr12 cuboctahedra that share corners with three equivalent Ba(1)Ba6Sr6 cuboctahedra; corners with three equivalent Sr(1)Ba3Sr9 cuboctahedra; corners with six equivalent Sr(2)Sr12 cuboctahedra; edges with three equivalent Ba(1)Ba6Sr6 cuboctahedra; edges with nine equivalent Sr(1)Ba3Sr9 cuboctahedra; edges with twelve Sr(2,2)Sr12 cuboctahedra; faces with six equivalent Sr(1)Ba3Sr9 cuboctahedra; and faces with twelve Sr(2,2)Sr12 cuboctahedra. In the fourth Sr site, Sr(2) is bonded to three equivalent Sr(1) and nine Sr(2,2) atoms to form SrSr12 cuboctahedra that share corners with three equivalent Ba(1)Ba6Sr6 cuboctahedra; corners with three equivalent Sr(1)Ba3Sr9 cuboctahedra; corners with six equivalent Sr(2)Sr12 cuboctahedra; edges with three equivalent Ba(1)Ba6Sr6 cuboctahedra; edges with nine equivalent Sr(1)Ba3Sr9 cuboctahedra; edges with twelve Sr(2,2)Sr12 cuboctahedra; faces with six equivalent Sr(1)Ba3Sr9 cuboctahedra; and faces with twelve Sr(2,2)Sr12 cuboctahedra. In the fifth Sr site, Sr(2) is bonded to three equivalent Sr(1) and nine Sr(2,2) atoms to form SrSr12 cuboctahedra that share corners with three equivalent Ba(1)Ba6Sr6 cuboctahedra; corners with three equivalent Sr(1)Ba3Sr9 cuboctahedra; corners with six equivalent Sr(2)Sr12 cuboctahedra; edges with three equivalent Ba(1)Ba6Sr6 cuboctahedra; edges with nine equivalent Sr(1)Ba3Sr9 cuboctahedra; edges with twelve Sr(2,2)Sr12 cuboctahedra; faces with six equivalent Sr(1)Ba3Sr9 cuboctahedra; and faces with twelve Sr(2,2)Sr12 cuboctahedra. In the sixth Sr site, Sr(2) is bonded to three equivalent Sr(1) and nine Sr(2,2) atoms to form SrSr12 cuboctahedra that share corners with three equivalent Ba(1)Ba6Sr6 cuboctahedra; corners with three equivalent Sr(1)Ba3Sr9 cuboctahedra; corners with six equivalent Sr(2)Sr12 cuboctahedra; edges with three equivalent Ba(1)Ba6Sr6 cuboctahedra; edges with nine equivalent Sr(1)Ba3Sr9 cuboctahedra; edges with twelve Sr(2,2)Sr12 cuboctahedra; faces with six equivalent Sr(1)Ba3Sr9 cuboctahedra; and faces with twelve Sr(2,2)Sr12 cuboctahedra. is represented by the CIF file [CIF]
data_BaSr4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   17.807
_cell_length_b   17.807
_cell_length_c   17.807
_cell_angle_alpha   13.874
_cell_angle_beta   13.874
_cell_angle_gamma   13.874
_symmetry_Int_Tables_number   1
_cell_volume   282.522
_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
  Ba  Ba0  1  0.000  0.000  0.000  1.0
  Sr  Sr1  1  0.599  0.599  0.599  1.0
  Sr  Sr2  1  0.200  0.200  0.200  1.0
  Sr  Sr3  1  0.800  0.800  0.800  1.0
  Sr  Sr4  1  0.401  0.401  0.401  1.0
[/CIF]
.
The material described by BaSr4 is alpha La-derived structured and crystallizes in the trigonal R-3m space group. Ba(1) is bonded to six equivalent Ba(1) and six equivalent Sr(1) atoms to form BaBa6Sr6 cuboctahedra that share corners with six equivalent Ba(1)Ba6Sr6 cuboctahedra, corners with six equivalent Sr(2)Sr12 cuboctahedra, edges with six equivalent Ba(1)Ba6Sr6 cuboctahedra, edges with six equivalent Sr(2)Sr12 cuboctahedra, edges with twelve equivalent Sr(1)Ba3Sr9 cuboctahedra, faces with six equivalent Ba(1)Ba6Sr6 cuboctahedra, and faces with twelve equivalent Sr(1)Ba3Sr9 cuboctahedra. There are six inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to three equivalent Ba(1), three equivalent Sr(2), and six equivalent Sr(1) atoms to form SrBa3Sr9 cuboctahedra that share corners with three equivalent Sr(2)Sr12 cuboctahedra; corners with nine equivalent Sr(1)Ba3Sr9 cuboctahedra; edges with six equivalent Ba(1)Ba6Sr6 cuboctahedra; edges with nine equivalent Sr(1)Ba3Sr9 cuboctahedra; edges with nine Sr(2,2)Sr12 cuboctahedra; faces with six equivalent Ba(1)Ba6Sr6 cuboctahedra; faces with six equivalent Sr(1)Ba3Sr9 cuboctahedra; and faces with six equivalent Sr(2)Sr12 cuboctahedra. In the second Sr site, Sr(2) is bonded to three equivalent Sr(1) and nine Sr(2,2) atoms to form SrSr12 cuboctahedra that share corners with three equivalent Ba(1)Ba6Sr6 cuboctahedra; corners with three equivalent Sr(1)Ba3Sr9 cuboctahedra; corners with six equivalent Sr(2)Sr12 cuboctahedra; edges with three equivalent Ba(1)Ba6Sr6 cuboctahedra; edges with nine equivalent Sr(1)Ba3Sr9 cuboctahedra; edges with twelve Sr(2,2)Sr12 cuboctahedra; faces with six equivalent Sr(1)Ba3Sr9 cuboctahedra; and faces with twelve Sr(2,2)Sr12 cuboctahedra. In the third Sr site, Sr(2) is bonded to three equivalent Sr(1) and nine Sr(2,2) atoms to form SrSr12 cuboctahedra that share corners with three equivalent Ba(1)Ba6Sr6 cuboctahedra; corners with three equivalent Sr(1)Ba3Sr9 cuboctahedra; corners with six equivalent Sr(2)Sr12 cuboctahedra; edges with three equivalent Ba(1)Ba6Sr6 cuboctahedra; edges with nine equivalent Sr(1)Ba3Sr9 cuboctahedra; edges with twelve Sr(2,2)Sr12 cuboctahedra; faces with six equivalent Sr(1)Ba3Sr9 cuboctahedra; and faces with twelve Sr(2,2)Sr12 cuboctahedra. In the fourth Sr site, Sr(2) is bonded to three equivalent Sr(1) and nine Sr(2,2) atoms to form SrSr12 cuboctahedra that share corners with three equivalent Ba(1)Ba6Sr6 cuboctahedra; corners with three equivalent Sr(1)Ba3Sr9 cuboctahedra; corners with six equivalent Sr(2)Sr12 cuboctahedra; edges with three equivalent Ba(1)Ba6Sr6 cuboctahedra; edges with nine equivalent Sr(1)Ba3Sr9 cuboctahedra; edges with twelve Sr(2,2)Sr12 cuboctahedra; faces with six equivalent Sr(1)Ba3Sr9 cuboctahedra; and faces with twelve Sr(2,2)Sr12 cuboctahedra. In the fifth Sr site, Sr(2) is bonded to three equivalent Sr(1) and nine Sr(2,2) atoms to form SrSr12 cuboctahedra that share corners with three equivalent Ba(1)Ba6Sr6 cuboctahedra; corners with three equivalent Sr(1)Ba3Sr9 cuboctahedra; corners with six equivalent Sr(2)Sr12 cuboctahedra; edges with three equivalent Ba(1)Ba6Sr6 cuboctahedra; edges with nine equivalent Sr(1)Ba3Sr9 cuboctahedra; edges with twelve Sr(2,2)Sr12 cuboctahedra; faces with six equivalent Sr(1)Ba3Sr9 cuboctahedra; and faces with twelve Sr(2,2)Sr12 cuboctahedra. In the sixth Sr site, Sr(2) is bonded to three equivalent Sr(1) and nine Sr(2,2) atoms to form SrSr12 cuboctahedra that share corners with three equivalent Ba(1)Ba6Sr6 cuboctahedra; corners with three equivalent Sr(1)Ba3Sr9 cuboctahedra; corners with six equivalent Sr(2)Sr12 cuboctahedra; edges with three equivalent Ba(1)Ba6Sr6 cuboctahedra; edges with nine equivalent Sr(1)Ba3Sr9 cuboctahedra; edges with twelve Sr(2,2)Sr12 cuboctahedra; faces with six equivalent Sr(1)Ba3Sr9 cuboctahedra; and faces with twelve Sr(2,2)Sr12 cuboctahedra. is represented by the CIF file [CIF]
data_BaSr4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   17.807
_cell_length_b   17.807
_cell_length_c   17.807
_cell_angle_alpha   13.874
_cell_angle_beta   13.874
_cell_angle_gamma   13.874
_symmetry_Int_Tables_number   1
_cell_volume   282.522
_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
  Ba  Ba0  1  0.000  0.000  0.000  1.0
  Sr  Sr1  1  0.599  0.599  0.599  1.0
  Sr  Sr2  1  0.200  0.200  0.200  1.0
  Sr  Sr3  1  0.800  0.800  0.800  1.0
  Sr  Sr4  1  0.401  0.401  0.401  1.0
[/CIF]
.