The structure described by SrAc3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Sr(1) is bonded to four equivalent Ac(1) and eight equivalent Ac(2) atoms to form SrAc12 cuboctahedra that share corners with four equivalent Sr(1)Ac12 cuboctahedra, corners with eight equivalent Ac(1)Sr4Ac8 cuboctahedra, edges with eight equivalent Sr(1)Ac12 cuboctahedra, edges with sixteen equivalent Ac(2)Sr4Ac8 cuboctahedra, faces with four equivalent Sr(1)Ac12 cuboctahedra, faces with six equivalent Ac(1)Sr4Ac8 cuboctahedra, and faces with eight equivalent Ac(2)Sr4Ac8 cuboctahedra. There are two inequivalent Ac sites. In the first Ac site, Ac(1) is bonded to four equivalent Sr(1) and eight equivalent Ac(2) atoms to form AcSr4Ac8 cuboctahedra that share corners with four equivalent Ac(1)Sr4Ac8 cuboctahedra, corners with eight equivalent Sr(1)Ac12 cuboctahedra, edges with eight equivalent Ac(1)Sr4Ac8 cuboctahedra, edges with sixteen equivalent Ac(2)Sr4Ac8 cuboctahedra, faces with four equivalent Ac(1)Sr4Ac8 cuboctahedra, faces with six equivalent Sr(1)Ac12 cuboctahedra, and faces with eight equivalent Ac(2)Sr4Ac8 cuboctahedra. In the second Ac site, Ac(2) is bonded to four equivalent Sr(1), four equivalent Ac(1), and four equivalent Ac(2) atoms to form AcSr4Ac8 cuboctahedra that share corners with twelve equivalent Ac(2)Sr4Ac8 cuboctahedra, edges with eight equivalent Sr(1)Ac12 cuboctahedra, edges with eight equivalent Ac(1)Sr4Ac8 cuboctahedra, edges with eight equivalent Ac(2)Sr4Ac8 cuboctahedra, faces with four equivalent Sr(1)Ac12 cuboctahedra, faces with four equivalent Ac(1)Sr4Ac8 cuboctahedra, and faces with ten equivalent Ac(2)Sr4Ac8 cuboctahedra. is represented by the CIF card [CIF]
data_SrAc3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.983
_cell_length_b   6.983
_cell_length_c   6.983
_cell_angle_alpha   131.493
_cell_angle_beta   131.493
_cell_angle_gamma   71.030
_symmetry_Int_Tables_number   1
_cell_volume   187.043
_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
  Ac  Ac1  1  0.500  0.500  0.000  1.0
  Ac  Ac2  1  0.750  0.250  0.500  1.0
  Ac  Ac3  1  0.250  0.750  0.500  1.0
[/CIF]
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The structure described by SrAc3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Sr(1) is bonded to four equivalent Ac(1) and eight equivalent Ac(2) atoms to form SrAc12 cuboctahedra that share corners with four equivalent Sr(1)Ac12 cuboctahedra, corners with eight equivalent Ac(1)Sr4Ac8 cuboctahedra, edges with eight equivalent Sr(1)Ac12 cuboctahedra, edges with sixteen equivalent Ac(2)Sr4Ac8 cuboctahedra, faces with four equivalent Sr(1)Ac12 cuboctahedra, faces with six equivalent Ac(1)Sr4Ac8 cuboctahedra, and faces with eight equivalent Ac(2)Sr4Ac8 cuboctahedra. There are two inequivalent Ac sites. In the first Ac site, Ac(1) is bonded to four equivalent Sr(1) and eight equivalent Ac(2) atoms to form AcSr4Ac8 cuboctahedra that share corners with four equivalent Ac(1)Sr4Ac8 cuboctahedra, corners with eight equivalent Sr(1)Ac12 cuboctahedra, edges with eight equivalent Ac(1)Sr4Ac8 cuboctahedra, edges with sixteen equivalent Ac(2)Sr4Ac8 cuboctahedra, faces with four equivalent Ac(1)Sr4Ac8 cuboctahedra, faces with six equivalent Sr(1)Ac12 cuboctahedra, and faces with eight equivalent Ac(2)Sr4Ac8 cuboctahedra. In the second Ac site, Ac(2) is bonded to four equivalent Sr(1), four equivalent Ac(1), and four equivalent Ac(2) atoms to form AcSr4Ac8 cuboctahedra that share corners with twelve equivalent Ac(2)Sr4Ac8 cuboctahedra, edges with eight equivalent Sr(1)Ac12 cuboctahedra, edges with eight equivalent Ac(1)Sr4Ac8 cuboctahedra, edges with eight equivalent Ac(2)Sr4Ac8 cuboctahedra, faces with four equivalent Sr(1)Ac12 cuboctahedra, faces with four equivalent Ac(1)Sr4Ac8 cuboctahedra, and faces with ten equivalent Ac(2)Sr4Ac8 cuboctahedra. is represented by the CIF card [CIF]
data_SrAc3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.983
_cell_length_b   6.983
_cell_length_c   6.983
_cell_angle_alpha   131.493
_cell_angle_beta   131.493
_cell_angle_gamma   71.030
_symmetry_Int_Tables_number   1
_cell_volume   187.043
_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
  Ac  Ac1  1  0.500  0.500  0.000  1.0
  Ac  Ac2  1  0.750  0.250  0.500  1.0
  Ac  Ac3  1  0.250  0.750  0.500  1.0
[/CIF]
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