The material described by SrGd3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Sr(1) is bonded to four equivalent Gd(2) and eight equivalent Gd(1) atoms to form SrGd12 cuboctahedra that share corners with four equivalent Sr(1)Gd12 cuboctahedra, corners with eight equivalent Gd(2)Sr4Gd8 cuboctahedra, edges with eight equivalent Sr(1)Gd12 cuboctahedra, edges with sixteen equivalent Gd(1)Sr4Gd8 cuboctahedra, faces with four equivalent Sr(1)Gd12 cuboctahedra, faces with six equivalent Gd(2)Sr4Gd8 cuboctahedra, and faces with eight equivalent Gd(1)Sr4Gd8 cuboctahedra. There are two inequivalent Gd sites. In the first Gd site, Gd(1) is bonded to four equivalent Sr(1), four equivalent Gd(1), and four equivalent Gd(2) atoms to form GdSr4Gd8 cuboctahedra that share corners with twelve equivalent Gd(1)Sr4Gd8 cuboctahedra, edges with eight equivalent Sr(1)Gd12 cuboctahedra, edges with eight equivalent Gd(1)Sr4Gd8 cuboctahedra, edges with eight equivalent Gd(2)Sr4Gd8 cuboctahedra, faces with four equivalent Sr(1)Gd12 cuboctahedra, faces with four equivalent Gd(2)Sr4Gd8 cuboctahedra, and faces with ten equivalent Gd(1)Sr4Gd8 cuboctahedra. In the second Gd site, Gd(2) is bonded to four equivalent Sr(1) and eight equivalent Gd(1) atoms to form GdSr4Gd8 cuboctahedra that share corners with four equivalent Gd(2)Sr4Gd8 cuboctahedra, corners with eight equivalent Sr(1)Gd12 cuboctahedra, edges with eight equivalent Gd(2)Sr4Gd8 cuboctahedra, edges with sixteen equivalent Gd(1)Sr4Gd8 cuboctahedra, faces with four equivalent Gd(2)Sr4Gd8 cuboctahedra, faces with six equivalent Sr(1)Gd12 cuboctahedra, and faces with eight equivalent Gd(1)Sr4Gd8 cuboctahedra. is represented by the CIF file [CIF]
data_SrGd3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.464
_cell_length_b   6.464
_cell_length_c   6.464
_cell_angle_alpha   132.181
_cell_angle_beta   132.181
_cell_angle_gamma   69.944
_symmetry_Int_Tables_number   1
_cell_volume   145.422
_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  0.000  0.000  0.000  1.0
  Gd  Gd1  1  0.750  0.250  0.500  1.0
  Gd  Gd2  1  0.250  0.750  0.500  1.0
  Gd  Gd3  1  0.500  0.500  0.000  1.0
[/CIF]
.
The material described by SrGd3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Sr(1) is bonded to four equivalent Gd(2) and eight equivalent Gd(1) atoms to form SrGd12 cuboctahedra that share corners with four equivalent Sr(1)Gd12 cuboctahedra, corners with eight equivalent Gd(2)Sr4Gd8 cuboctahedra, edges with eight equivalent Sr(1)Gd12 cuboctahedra, edges with sixteen equivalent Gd(1)Sr4Gd8 cuboctahedra, faces with four equivalent Sr(1)Gd12 cuboctahedra, faces with six equivalent Gd(2)Sr4Gd8 cuboctahedra, and faces with eight equivalent Gd(1)Sr4Gd8 cuboctahedra. There are two inequivalent Gd sites. In the first Gd site, Gd(1) is bonded to four equivalent Sr(1), four equivalent Gd(1), and four equivalent Gd(2) atoms to form GdSr4Gd8 cuboctahedra that share corners with twelve equivalent Gd(1)Sr4Gd8 cuboctahedra, edges with eight equivalent Sr(1)Gd12 cuboctahedra, edges with eight equivalent Gd(1)Sr4Gd8 cuboctahedra, edges with eight equivalent Gd(2)Sr4Gd8 cuboctahedra, faces with four equivalent Sr(1)Gd12 cuboctahedra, faces with four equivalent Gd(2)Sr4Gd8 cuboctahedra, and faces with ten equivalent Gd(1)Sr4Gd8 cuboctahedra. In the second Gd site, Gd(2) is bonded to four equivalent Sr(1) and eight equivalent Gd(1) atoms to form GdSr4Gd8 cuboctahedra that share corners with four equivalent Gd(2)Sr4Gd8 cuboctahedra, corners with eight equivalent Sr(1)Gd12 cuboctahedra, edges with eight equivalent Gd(2)Sr4Gd8 cuboctahedra, edges with sixteen equivalent Gd(1)Sr4Gd8 cuboctahedra, faces with four equivalent Gd(2)Sr4Gd8 cuboctahedra, faces with six equivalent Sr(1)Gd12 cuboctahedra, and faces with eight equivalent Gd(1)Sr4Gd8 cuboctahedra. is represented by the CIF file [CIF]
data_SrGd3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.464
_cell_length_b   6.464
_cell_length_c   6.464
_cell_angle_alpha   132.181
_cell_angle_beta   132.181
_cell_angle_gamma   69.944
_symmetry_Int_Tables_number   1
_cell_volume   145.422
_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  0.000  0.000  0.000  1.0
  Gd  Gd1  1  0.750  0.250  0.500  1.0
  Gd  Gd2  1  0.250  0.750  0.500  1.0
  Gd  Gd3  1  0.500  0.500  0.000  1.0
[/CIF]
.