The material structure described by Be17Sc2 crystallizes in the hexagonal P6_3/mmc space group. There are four inequivalent Be sites. In the first Be site, Be(4) is bonded to two equivalent Be(2), four equivalent Be(1), four equivalent Be(3), and two equivalent Sc(2) atoms to form distorted BeSc2Be10 cuboctahedra that share corners with four equivalent Be(4)Sc2Be10 cuboctahedra, corners with eight equivalent Be(3)Sc2Be10 cuboctahedra, corners with ten equivalent Be(1)Sc3Be9 cuboctahedra, edges with four equivalent Be(3)Sc2Be10 cuboctahedra, edges with six equivalent Be(1)Sc3Be9 cuboctahedra, faces with four equivalent Be(1)Sc3Be9 cuboctahedra, faces with six equivalent Be(4)Sc2Be10 cuboctahedra, and faces with eight equivalent Be(3)Sc2Be10 cuboctahedra. In the second Be site, Be(1) is bonded to one Be(2), two equivalent Be(1), two equivalent Be(4), four equivalent Be(3), one Sc(2), and two equivalent Sc(1) atoms to form distorted BeSc3Be9 cuboctahedra that share corners with five equivalent Be(4)Sc2Be10 cuboctahedra, corners with eight equivalent Be(3)Sc2Be10 cuboctahedra, corners with ten equivalent Be(1)Sc3Be9 cuboctahedra, edges with two equivalent Be(3)Sc2Be10 cuboctahedra, edges with three equivalent Be(4)Sc2Be10 cuboctahedra, edges with five equivalent Be(1)Sc3Be9 cuboctahedra, faces with two equivalent Be(4)Sc2Be10 cuboctahedra, faces with eight equivalent Be(1)Sc3Be9 cuboctahedra, and faces with ten equivalent Be(3)Sc2Be10 cuboctahedra. In the third Be site, Be(2) is bonded in a 14-coordinate geometry to one Be(2), three equivalent Be(1), three equivalent Be(4), six equivalent Be(3), and one Sc(2) atom. In the fourth Be site, Be(3) is bonded to two equivalent Be(2), two equivalent Be(3), two equivalent Be(4), four equivalent Be(1), one Sc(1), and one Sc(2) atom to form distorted BeSc2Be10 cuboctahedra that share corners with four equivalent Be(4)Sc2Be10 cuboctahedra, corners with eight equivalent Be(1)Sc3Be9 cuboctahedra, corners with twelve equivalent Be(3)Sc2Be10 cuboctahedra,  an edgeedge with one Be(3)Sc2Be10 cuboctahedra, edges with two equivalent Be(4)Sc2Be10 cuboctahedra, edges with two equivalent Be(1)Sc3Be9 cuboctahedra, faces with four equivalent Be(4)Sc2Be10 cuboctahedra, faces with seven equivalent Be(3)Sc2Be10 cuboctahedra, and faces with ten equivalent Be(1)Sc3Be9 cuboctahedra. There are two inequivalent Sc sites. In the first Sc site, Sc(1) is bonded in a 18-coordinate geometry to six equivalent Be(3) and twelve equivalent Be(1) atoms. In the second Sc site, Sc(2) is bonded in a 20-coordinate geometry to two equivalent Be(2), six equivalent Be(1), six equivalent Be(3), and six equivalent Be(4) atoms. is represented by the CIF file [CIF]
data_Sc2Be17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.334
_cell_length_b   7.528
_cell_length_c   7.528
_cell_angle_alpha   120.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   359.956
_cell_formula_units_Z   2
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  0.750  0.000  0.000  1.0
  Sc  Sc1  1  0.250  0.000  0.000  1.0
  Sc  Sc2  1  0.750  0.667  0.333  1.0
  Sc  Sc3  1  0.250  0.333  0.667  1.0
  Be  Be4  1  0.988  0.834  0.166  1.0
  Be  Be5  1  0.012  0.166  0.834  1.0
  Be  Be6  1  0.988  0.332  0.166  1.0
  Be  Be7  1  0.488  0.166  0.834  1.0
  Be  Be8  1  0.012  0.668  0.834  1.0
  Be  Be9  1  0.512  0.834  0.166  1.0
  Be  Be10  1  0.988  0.834  0.668  1.0
  Be  Be11  1  0.488  0.668  0.834  1.0
  Be  Be12  1  0.012  0.166  0.332  1.0
  Be  Be13  1  0.512  0.332  0.166  1.0
  Be  Be14  1  0.488  0.166  0.332  1.0
  Be  Be15  1  0.512  0.834  0.668  1.0
  Be  Be16  1  0.394  0.667  0.333  1.0
  Be  Be17  1  0.606  0.333  0.667  1.0
  Be  Be18  1  0.894  0.333  0.667  1.0
  Be  Be19  1  0.106  0.667  0.333  1.0
  Be  Be20  1  0.750  0.046  0.378  1.0
  Be  Be21  1  0.250  0.954  0.622  1.0
  Be  Be22  1  0.750  0.331  0.954  1.0
  Be  Be23  1  0.250  0.669  0.622  1.0
  Be  Be24  1  0.250  0.669  0.046  1.0
  Be  Be25  1  0.750  0.331  0.378  1.0
  Be  Be26  1  0.750  0.622  0.669  1.0
  Be  Be27  1  0.250  0.378  0.046  1.0
  Be  Be28  1  0.250  0.378  0.331  1.0
  Be  Be29  1  0.750  0.622  0.954  1.0
  Be  Be30  1  0.250  0.954  0.331  1.0
  Be  Be31  1  0.750  0.046  0.669  1.0
  Be  Be32  1  0.000  0.500  0.500  1.0
  Be  Be33  1  0.000  0.000  0.500  1.0
  Be  Be34  1  0.500  0.500  0.500  1.0
  Be  Be35  1  0.000  0.500  0.000  1.0
  Be  Be36  1  0.500  0.000  0.500  1.0
  Be  Be37  1  0.500  0.500  0.000  1.0
[/CIF]
.
The material structure described by Be17Sc2 crystallizes in the hexagonal P6_3/mmc space group. There are four inequivalent Be sites. In the first Be site, Be(4) is bonded to two equivalent Be(2), four equivalent Be(1), four equivalent Be(3), and two equivalent Sc(2) atoms to form distorted BeSc2Be10 cuboctahedra that share corners with four equivalent Be(4)Sc2Be10 cuboctahedra, corners with eight equivalent Be(3)Sc2Be10 cuboctahedra, corners with ten equivalent Be(1)Sc3Be9 cuboctahedra, edges with four equivalent Be(3)Sc2Be10 cuboctahedra, edges with six equivalent Be(1)Sc3Be9 cuboctahedra, faces with four equivalent Be(1)Sc3Be9 cuboctahedra, faces with six equivalent Be(4)Sc2Be10 cuboctahedra, and faces with eight equivalent Be(3)Sc2Be10 cuboctahedra. In the second Be site, Be(1) is bonded to one Be(2), two equivalent Be(1), two equivalent Be(4), four equivalent Be(3), one Sc(2), and two equivalent Sc(1) atoms to form distorted BeSc3Be9 cuboctahedra that share corners with five equivalent Be(4)Sc2Be10 cuboctahedra, corners with eight equivalent Be(3)Sc2Be10 cuboctahedra, corners with ten equivalent Be(1)Sc3Be9 cuboctahedra, edges with two equivalent Be(3)Sc2Be10 cuboctahedra, edges with three equivalent Be(4)Sc2Be10 cuboctahedra, edges with five equivalent Be(1)Sc3Be9 cuboctahedra, faces with two equivalent Be(4)Sc2Be10 cuboctahedra, faces with eight equivalent Be(1)Sc3Be9 cuboctahedra, and faces with ten equivalent Be(3)Sc2Be10 cuboctahedra. In the third Be site, Be(2) is bonded in a 14-coordinate geometry to one Be(2), three equivalent Be(1), three equivalent Be(4), six equivalent Be(3), and one Sc(2) atom. In the fourth Be site, Be(3) is bonded to two equivalent Be(2), two equivalent Be(3), two equivalent Be(4), four equivalent Be(1), one Sc(1), and one Sc(2) atom to form distorted BeSc2Be10 cuboctahedra that share corners with four equivalent Be(4)Sc2Be10 cuboctahedra, corners with eight equivalent Be(1)Sc3Be9 cuboctahedra, corners with twelve equivalent Be(3)Sc2Be10 cuboctahedra,  an edgeedge with one Be(3)Sc2Be10 cuboctahedra, edges with two equivalent Be(4)Sc2Be10 cuboctahedra, edges with two equivalent Be(1)Sc3Be9 cuboctahedra, faces with four equivalent Be(4)Sc2Be10 cuboctahedra, faces with seven equivalent Be(3)Sc2Be10 cuboctahedra, and faces with ten equivalent Be(1)Sc3Be9 cuboctahedra. There are two inequivalent Sc sites. In the first Sc site, Sc(1) is bonded in a 18-coordinate geometry to six equivalent Be(3) and twelve equivalent Be(1) atoms. In the second Sc site, Sc(2) is bonded in a 20-coordinate geometry to two equivalent Be(2), six equivalent Be(1), six equivalent Be(3), and six equivalent Be(4) atoms. is represented by the CIF file [CIF]
data_Sc2Be17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.334
_cell_length_b   7.528
_cell_length_c   7.528
_cell_angle_alpha   120.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   359.956
_cell_formula_units_Z   2
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  0.750  0.000  0.000  1.0
  Sc  Sc1  1  0.250  0.000  0.000  1.0
  Sc  Sc2  1  0.750  0.667  0.333  1.0
  Sc  Sc3  1  0.250  0.333  0.667  1.0
  Be  Be4  1  0.988  0.834  0.166  1.0
  Be  Be5  1  0.012  0.166  0.834  1.0
  Be  Be6  1  0.988  0.332  0.166  1.0
  Be  Be7  1  0.488  0.166  0.834  1.0
  Be  Be8  1  0.012  0.668  0.834  1.0
  Be  Be9  1  0.512  0.834  0.166  1.0
  Be  Be10  1  0.988  0.834  0.668  1.0
  Be  Be11  1  0.488  0.668  0.834  1.0
  Be  Be12  1  0.012  0.166  0.332  1.0
  Be  Be13  1  0.512  0.332  0.166  1.0
  Be  Be14  1  0.488  0.166  0.332  1.0
  Be  Be15  1  0.512  0.834  0.668  1.0
  Be  Be16  1  0.394  0.667  0.333  1.0
  Be  Be17  1  0.606  0.333  0.667  1.0
  Be  Be18  1  0.894  0.333  0.667  1.0
  Be  Be19  1  0.106  0.667  0.333  1.0
  Be  Be20  1  0.750  0.046  0.378  1.0
  Be  Be21  1  0.250  0.954  0.622  1.0
  Be  Be22  1  0.750  0.331  0.954  1.0
  Be  Be23  1  0.250  0.669  0.622  1.0
  Be  Be24  1  0.250  0.669  0.046  1.0
  Be  Be25  1  0.750  0.331  0.378  1.0
  Be  Be26  1  0.750  0.622  0.669  1.0
  Be  Be27  1  0.250  0.378  0.046  1.0
  Be  Be28  1  0.250  0.378  0.331  1.0
  Be  Be29  1  0.750  0.622  0.954  1.0
  Be  Be30  1  0.250  0.954  0.331  1.0
  Be  Be31  1  0.750  0.046  0.669  1.0
  Be  Be32  1  0.000  0.500  0.500  1.0
  Be  Be33  1  0.000  0.000  0.500  1.0
  Be  Be34  1  0.500  0.500  0.500  1.0
  Be  Be35  1  0.000  0.500  0.000  1.0
  Be  Be36  1  0.500  0.000  0.500  1.0
  Be  Be37  1  0.500  0.500  0.000  1.0
[/CIF]
.