The compound described by Tm2Fe15Al2 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 18-coordinate geometry to six equivalent Fe(2) and twelve equivalent Fe(3) atoms. In the second Tm site, Tm(2) is bonded in a 20-coordinate geometry to six equivalent Fe(1), six equivalent Fe(2), six equivalent Fe(3), and two equivalent Al(1) atoms. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent Tm(2), four equivalent Fe(2), four equivalent Fe(3), and two equivalent Al(1) atoms to form distorted FeTm2Al2Fe8 cuboctahedra that share corners with four equivalent Fe(1)Tm2Al2Fe8 cuboctahedra, corners with eight equivalent Fe(2)Tm2Al2Fe8 cuboctahedra, corners with ten equivalent Fe(3)Tm3AlFe8 cuboctahedra, edges with four equivalent Fe(2)Tm2Al2Fe8 cuboctahedra, edges with six equivalent Fe(3)Tm3AlFe8 cuboctahedra, faces with four equivalent Fe(3)Tm3AlFe8 cuboctahedra, faces with six equivalent Fe(1)Tm2Al2Fe8 cuboctahedra, and faces with eight equivalent Fe(2)Tm2Al2Fe8 cuboctahedra. In the second Fe site, Fe(2) is bonded to one Tm(1), one Tm(2), two equivalent Fe(1), two equivalent Fe(2), four equivalent Fe(3), and two equivalent Al(1) atoms to form distorted FeTm2Al2Fe8 cuboctahedra that share corners with four equivalent Fe(1)Tm2Al2Fe8 cuboctahedra, corners with eight equivalent Fe(3)Tm3AlFe8 cuboctahedra, corners with twelve equivalent Fe(2)Tm2Al2Fe8 cuboctahedra,  an edgeedge with one Fe(2)Tm2Al2Fe8 cuboctahedra, edges with two equivalent Fe(1)Tm2Al2Fe8 cuboctahedra, edges with two equivalent Fe(3)Tm3AlFe8 cuboctahedra, faces with four equivalent Fe(1)Tm2Al2Fe8 cuboctahedra, faces with seven equivalent Fe(2)Tm2Al2Fe8 cuboctahedra, and faces with ten equivalent Fe(3)Tm3AlFe8 cuboctahedra. In the third Fe site, Fe(3) is bonded to one Tm(2), two equivalent Tm(1), two equivalent Fe(1), two equivalent Fe(3), four equivalent Fe(2), and one Al(1) atom to form distorted FeTm3AlFe8 cuboctahedra that share corners with five equivalent Fe(1)Tm2Al2Fe8 cuboctahedra, corners with eight equivalent Fe(2)Tm2Al2Fe8 cuboctahedra, corners with ten equivalent Fe(3)Tm3AlFe8 cuboctahedra, edges with two equivalent Fe(2)Tm2Al2Fe8 cuboctahedra, edges with three equivalent Fe(1)Tm2Al2Fe8 cuboctahedra, edges with five equivalent Fe(3)Tm3AlFe8 cuboctahedra, faces with two equivalent Fe(1)Tm2Al2Fe8 cuboctahedra, faces with eight equivalent Fe(3)Tm3AlFe8 cuboctahedra, and faces with ten equivalent Fe(2)Tm2Al2Fe8 cuboctahedra. Al(1) is bonded in a 14-coordinate geometry to one Tm(2), three equivalent Fe(1), three equivalent Fe(3), six equivalent Fe(2), and one Al(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Tm2Al2Fe15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.322
_cell_length_b   8.322
_cell_length_c   8.374
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   502.243
_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
  Tm  Tm0  1  0.000  0.000  0.250  1.0
  Tm  Tm1  1  0.000  0.000  0.750  1.0
  Tm  Tm2  1  0.333  0.667  0.750  1.0
  Tm  Tm3  1  0.667  0.333  0.250  1.0
  Al  Al4  1  0.333  0.667  0.400  1.0
  Al  Al5  1  0.667  0.333  0.600  1.0
  Al  Al6  1  0.667  0.333  0.900  1.0
  Al  Al7  1  0.333  0.667  0.100  1.0
  Fe  Fe8  1  0.500  0.500  0.500  1.0
  Fe  Fe9  1  0.500  0.000  0.500  1.0
  Fe  Fe10  1  0.000  0.500  0.500  1.0
  Fe  Fe11  1  0.500  0.500  0.000  1.0
  Fe  Fe12  1  0.500  0.000  0.000  1.0
  Fe  Fe13  1  0.000  0.500  0.000  1.0
  Fe  Fe14  1  0.331  0.362  0.250  1.0
  Fe  Fe15  1  0.638  0.969  0.250  1.0
  Fe  Fe16  1  0.031  0.669  0.250  1.0
  Fe  Fe17  1  0.638  0.669  0.250  1.0
  Fe  Fe18  1  0.031  0.362  0.250  1.0
  Fe  Fe19  1  0.331  0.969  0.250  1.0
  Fe  Fe20  1  0.669  0.638  0.750  1.0
  Fe  Fe21  1  0.362  0.031  0.750  1.0
  Fe  Fe22  1  0.969  0.331  0.750  1.0
  Fe  Fe23  1  0.362  0.331  0.750  1.0
  Fe  Fe24  1  0.969  0.638  0.750  1.0
  Fe  Fe25  1  0.669  0.031  0.750  1.0
  Fe  Fe26  1  0.165  0.835  0.512  1.0
  Fe  Fe27  1  0.165  0.331  0.512  1.0
  Fe  Fe28  1  0.669  0.835  0.512  1.0
  Fe  Fe29  1  0.835  0.165  0.488  1.0
  Fe  Fe30  1  0.835  0.669  0.488  1.0
  Fe  Fe31  1  0.331  0.165  0.488  1.0
  Fe  Fe32  1  0.835  0.165  0.012  1.0
  Fe  Fe33  1  0.835  0.669  0.012  1.0
  Fe  Fe34  1  0.331  0.165  0.012  1.0
  Fe  Fe35  1  0.165  0.835  0.988  1.0
  Fe  Fe36  1  0.165  0.331  0.988  1.0
  Fe  Fe37  1  0.669  0.835  0.988  1.0
[/CIF]
.
The compound described by Tm2Fe15Al2 crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 18-coordinate geometry to six equivalent Fe(2) and twelve equivalent Fe(3) atoms. In the second Tm site, Tm(2) is bonded in a 20-coordinate geometry to six equivalent Fe(1), six equivalent Fe(2), six equivalent Fe(3), and two equivalent Al(1) atoms. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent Tm(2), four equivalent Fe(2), four equivalent Fe(3), and two equivalent Al(1) atoms to form distorted FeTm2Al2Fe8 cuboctahedra that share corners with four equivalent Fe(1)Tm2Al2Fe8 cuboctahedra, corners with eight equivalent Fe(2)Tm2Al2Fe8 cuboctahedra, corners with ten equivalent Fe(3)Tm3AlFe8 cuboctahedra, edges with four equivalent Fe(2)Tm2Al2Fe8 cuboctahedra, edges with six equivalent Fe(3)Tm3AlFe8 cuboctahedra, faces with four equivalent Fe(3)Tm3AlFe8 cuboctahedra, faces with six equivalent Fe(1)Tm2Al2Fe8 cuboctahedra, and faces with eight equivalent Fe(2)Tm2Al2Fe8 cuboctahedra. In the second Fe site, Fe(2) is bonded to one Tm(1), one Tm(2), two equivalent Fe(1), two equivalent Fe(2), four equivalent Fe(3), and two equivalent Al(1) atoms to form distorted FeTm2Al2Fe8 cuboctahedra that share corners with four equivalent Fe(1)Tm2Al2Fe8 cuboctahedra, corners with eight equivalent Fe(3)Tm3AlFe8 cuboctahedra, corners with twelve equivalent Fe(2)Tm2Al2Fe8 cuboctahedra,  an edgeedge with one Fe(2)Tm2Al2Fe8 cuboctahedra, edges with two equivalent Fe(1)Tm2Al2Fe8 cuboctahedra, edges with two equivalent Fe(3)Tm3AlFe8 cuboctahedra, faces with four equivalent Fe(1)Tm2Al2Fe8 cuboctahedra, faces with seven equivalent Fe(2)Tm2Al2Fe8 cuboctahedra, and faces with ten equivalent Fe(3)Tm3AlFe8 cuboctahedra. In the third Fe site, Fe(3) is bonded to one Tm(2), two equivalent Tm(1), two equivalent Fe(1), two equivalent Fe(3), four equivalent Fe(2), and one Al(1) atom to form distorted FeTm3AlFe8 cuboctahedra that share corners with five equivalent Fe(1)Tm2Al2Fe8 cuboctahedra, corners with eight equivalent Fe(2)Tm2Al2Fe8 cuboctahedra, corners with ten equivalent Fe(3)Tm3AlFe8 cuboctahedra, edges with two equivalent Fe(2)Tm2Al2Fe8 cuboctahedra, edges with three equivalent Fe(1)Tm2Al2Fe8 cuboctahedra, edges with five equivalent Fe(3)Tm3AlFe8 cuboctahedra, faces with two equivalent Fe(1)Tm2Al2Fe8 cuboctahedra, faces with eight equivalent Fe(3)Tm3AlFe8 cuboctahedra, and faces with ten equivalent Fe(2)Tm2Al2Fe8 cuboctahedra. Al(1) is bonded in a 14-coordinate geometry to one Tm(2), three equivalent Fe(1), three equivalent Fe(3), six equivalent Fe(2), and one Al(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Tm2Al2Fe15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.322
_cell_length_b   8.322
_cell_length_c   8.374
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   502.243
_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
  Tm  Tm0  1  0.000  0.000  0.250  1.0
  Tm  Tm1  1  0.000  0.000  0.750  1.0
  Tm  Tm2  1  0.333  0.667  0.750  1.0
  Tm  Tm3  1  0.667  0.333  0.250  1.0
  Al  Al4  1  0.333  0.667  0.400  1.0
  Al  Al5  1  0.667  0.333  0.600  1.0
  Al  Al6  1  0.667  0.333  0.900  1.0
  Al  Al7  1  0.333  0.667  0.100  1.0
  Fe  Fe8  1  0.500  0.500  0.500  1.0
  Fe  Fe9  1  0.500  0.000  0.500  1.0
  Fe  Fe10  1  0.000  0.500  0.500  1.0
  Fe  Fe11  1  0.500  0.500  0.000  1.0
  Fe  Fe12  1  0.500  0.000  0.000  1.0
  Fe  Fe13  1  0.000  0.500  0.000  1.0
  Fe  Fe14  1  0.331  0.362  0.250  1.0
  Fe  Fe15  1  0.638  0.969  0.250  1.0
  Fe  Fe16  1  0.031  0.669  0.250  1.0
  Fe  Fe17  1  0.638  0.669  0.250  1.0
  Fe  Fe18  1  0.031  0.362  0.250  1.0
  Fe  Fe19  1  0.331  0.969  0.250  1.0
  Fe  Fe20  1  0.669  0.638  0.750  1.0
  Fe  Fe21  1  0.362  0.031  0.750  1.0
  Fe  Fe22  1  0.969  0.331  0.750  1.0
  Fe  Fe23  1  0.362  0.331  0.750  1.0
  Fe  Fe24  1  0.969  0.638  0.750  1.0
  Fe  Fe25  1  0.669  0.031  0.750  1.0
  Fe  Fe26  1  0.165  0.835  0.512  1.0
  Fe  Fe27  1  0.165  0.331  0.512  1.0
  Fe  Fe28  1  0.669  0.835  0.512  1.0
  Fe  Fe29  1  0.835  0.165  0.488  1.0
  Fe  Fe30  1  0.835  0.669  0.488  1.0
  Fe  Fe31  1  0.331  0.165  0.488  1.0
  Fe  Fe32  1  0.835  0.165  0.012  1.0
  Fe  Fe33  1  0.835  0.669  0.012  1.0
  Fe  Fe34  1  0.331  0.165  0.012  1.0
  Fe  Fe35  1  0.165  0.835  0.988  1.0
  Fe  Fe36  1  0.165  0.331  0.988  1.0
  Fe  Fe37  1  0.669  0.835  0.988  1.0
[/CIF]
.