The structure described by Sc2Co3Al is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the trigonal R-3m space group. Sc(1) is bonded in a 16-coordinate geometry to four equivalent Sc(1), nine equivalent Co(1), and three equivalent Al(1) atoms. Co(1) is bonded to six equivalent Sc(1), four equivalent Co(1), and two equivalent Al(1) atoms to form distorted CoSc6Al2Co4 cuboctahedra that share corners with four equivalent Al(1)Sc6Co6 cuboctahedra, corners with fourteen equivalent Co(1)Sc6Al2Co4 cuboctahedra, edges with six equivalent Co(1)Sc6Al2Co4 cuboctahedra, faces with six equivalent Al(1)Sc6Co6 cuboctahedra, and faces with twelve equivalent Co(1)Sc6Al2Co4 cuboctahedra. Al(1) is bonded to six equivalent Sc(1) and six equivalent Co(1) atoms to form distorted AlSc6Co6 cuboctahedra that share corners with six equivalent Al(1)Sc6Co6 cuboctahedra, corners with twelve equivalent Co(1)Sc6Al2Co4 cuboctahedra, edges with six equivalent Al(1)Sc6Co6 cuboctahedra, and faces with eighteen equivalent Co(1)Sc6Al2Co4 cuboctahedra. is represented by the CIF file [CIF]
data_Sc2AlCo3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.807
_cell_length_b   4.807
_cell_length_c   4.807
_cell_angle_alpha   64.042
_cell_angle_beta   64.042
_cell_angle_gamma   64.042
_symmetry_Int_Tables_number   1
_cell_volume   85.522
_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
  Sc  Sc0  1  0.627  0.627  0.627  1.0
  Sc  Sc1  1  0.373  0.373  0.373  1.0
  Al  Al2  1  0.000  0.000  0.000  1.0
  Co  Co3  1  0.000  0.500  0.000  1.0
  Co  Co4  1  0.500  0.000  0.000  1.0
  Co  Co5  1  0.000  0.000  0.500  1.0
[/CIF]
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The structure described by Sc2Co3Al is Frank-Kasper $\mu$ Phase-derived structured and crystallizes in the trigonal R-3m space group. Sc(1) is bonded in a 16-coordinate geometry to four equivalent Sc(1), nine equivalent Co(1), and three equivalent Al(1) atoms. Co(1) is bonded to six equivalent Sc(1), four equivalent Co(1), and two equivalent Al(1) atoms to form distorted CoSc6Al2Co4 cuboctahedra that share corners with four equivalent Al(1)Sc6Co6 cuboctahedra, corners with fourteen equivalent Co(1)Sc6Al2Co4 cuboctahedra, edges with six equivalent Co(1)Sc6Al2Co4 cuboctahedra, faces with six equivalent Al(1)Sc6Co6 cuboctahedra, and faces with twelve equivalent Co(1)Sc6Al2Co4 cuboctahedra. Al(1) is bonded to six equivalent Sc(1) and six equivalent Co(1) atoms to form distorted AlSc6Co6 cuboctahedra that share corners with six equivalent Al(1)Sc6Co6 cuboctahedra, corners with twelve equivalent Co(1)Sc6Al2Co4 cuboctahedra, edges with six equivalent Al(1)Sc6Co6 cuboctahedra, and faces with eighteen equivalent Co(1)Sc6Al2Co4 cuboctahedra. is represented by the CIF file [CIF]
data_Sc2AlCo3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.807
_cell_length_b   4.807
_cell_length_c   4.807
_cell_angle_alpha   64.042
_cell_angle_beta   64.042
_cell_angle_gamma   64.042
_symmetry_Int_Tables_number   1
_cell_volume   85.522
_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
  Sc  Sc0  1  0.627  0.627  0.627  1.0
  Sc  Sc1  1  0.373  0.373  0.373  1.0
  Al  Al2  1  0.000  0.000  0.000  1.0
  Co  Co3  1  0.000  0.500  0.000  1.0
  Co  Co4  1  0.500  0.000  0.000  1.0
  Co  Co5  1  0.000  0.000  0.500  1.0
[/CIF]
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