The compound described by GdTiFe9Si2 crystallizes in the monoclinic Cm space group. Gd(1) is bonded in a 20-coordinate geometry to one Ti(1), one Fe(6), one Fe(7), one Fe(8), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), four equivalent Fe(5), and four equivalent Si(1) atoms. Ti(1) is bonded in a 14-coordinate geometry to one Gd(1), one Fe(1), one Fe(2), one Fe(8), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(6), two equivalent Fe(7), and two equivalent Si(1) atoms. There are eight inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to two equivalent Gd(1), one Ti(1), one Fe(3), one Fe(4), one Fe(8), two equivalent Fe(5), two equivalent Fe(7), and two equivalent Si(1) atoms. In the second Fe site, Fe(2) is bonded in a 12-coordinate geometry to two equivalent Gd(1), one Ti(1), one Fe(3), one Fe(4), one Fe(8), two equivalent Fe(5), two equivalent Fe(6), and two equivalent Si(1) atoms. In the third Fe site, Fe(3) is bonded to two equivalent Gd(1), two equivalent Ti(1), one Fe(1), one Fe(2), one Fe(6), one Fe(7), two equivalent Fe(5), and two equivalent Si(1) atoms to form distorted FeGd2Ti2Fe6Si2 cuboctahedra that share corners with four equivalent Fe(5)Gd2TiFe9 cuboctahedra, corners with four equivalent Si(1)Gd2TiFe7Si2 cuboctahedra, corners with six equivalent Fe(4)Gd2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(4)Gd2Fe8Si2 cuboctahedra, edges with two equivalent Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, edges with two equivalent Fe(5)Gd2TiFe9 cuboctahedra, edges with two equivalent Si(1)Gd2TiFe7Si2 cuboctahedra,  a faceface with one Fe(4)Gd2Fe8Si2 cuboctahedra, faces with four equivalent Fe(5)Gd2TiFe9 cuboctahedra, and faces with four equivalent Si(1)Gd2TiFe7Si2 cuboctahedra. In the fourth Fe site, Fe(4) is bonded to two equivalent Gd(1), one Fe(1), one Fe(2), one Fe(6), one Fe(7), two equivalent Fe(5), two equivalent Fe(8), and two equivalent Si(1) atoms to form distorted FeGd2Fe8Si2 cuboctahedra that share corners with four equivalent Fe(5)Gd2TiFe9 cuboctahedra, corners with four equivalent Si(1)Gd2TiFe7Si2 cuboctahedra, corners with six equivalent Fe(3)Gd2Ti2Fe6Si2 cuboctahedra,  an edgeedge with one Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, edges with two equivalent Fe(4)Gd2Fe8Si2 cuboctahedra, edges with two equivalent Fe(5)Gd2TiFe9 cuboctahedra, edges with two equivalent Si(1)Gd2TiFe7Si2 cuboctahedra,  a faceface with one Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, faces with four equivalent Fe(5)Gd2TiFe9 cuboctahedra, and faces with four equivalent Si(1)Gd2TiFe7Si2 cuboctahedra. In the fifth Fe site, Fe(5) is bonded to two equivalent Gd(1), one Ti(1), one Fe(1), one Fe(2), one Fe(3), one Fe(4), one Fe(6), one Fe(7), one Fe(8), and two equivalent Fe(5) atoms to form distorted FeGd2TiFe9 cuboctahedra that share corners with two equivalent Fe(4)Gd2Fe8Si2 cuboctahedra, corners with two equivalent Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, corners with four equivalent Si(1)Gd2TiFe7Si2 cuboctahedra, corners with six equivalent Fe(5)Gd2TiFe9 cuboctahedra,  an edgeedge with one Fe(4)Gd2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, edges with four equivalent Si(1)Gd2TiFe7Si2 cuboctahedra, faces with two equivalent Fe(4)Gd2Fe8Si2 cuboctahedra, faces with two equivalent Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, faces with two equivalent Fe(5)Gd2TiFe9 cuboctahedra, and faces with four equivalent Si(1)Gd2TiFe7Si2 cuboctahedra. In the sixth Fe site, Fe(6) is bonded in a 12-coordinate geometry to one Gd(1), two equivalent Ti(1), one Fe(3), one Fe(4), one Fe(7), two equivalent Fe(2), two equivalent Fe(5), and two equivalent Si(1) atoms. In the seventh Fe site, Fe(7) is bonded in a 14-coordinate geometry to one Gd(1), two equivalent Ti(1), one Fe(3), one Fe(4), one Fe(6), two equivalent Fe(1), two equivalent Fe(5), two equivalent Fe(8), and two equivalent Si(1) atoms. In the eighth Fe site, Fe(8) is bonded in a 1-coordinate geometry to one Gd(1), one Ti(1), one Fe(1), one Fe(2), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(7), and two equivalent Si(1) atoms. Si(1) is bonded to two equivalent Gd(1), one Ti(1), one Fe(1), one Fe(2), one Fe(3), one Fe(4), one Fe(6), one Fe(7), one Fe(8), and two equivalent Si(1) atoms to form distorted SiGd2TiFe7Si2 cuboctahedra that share corners with two equivalent Fe(4)Gd2Fe8Si2 cuboctahedra, corners with two equivalent Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, corners with four equivalent Fe(5)Gd2TiFe9 cuboctahedra, corners with six equivalent Si(1)Gd2TiFe7Si2 cuboctahedra,  an edgeedge with one Fe(4)Gd2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, edges with four equivalent Fe(5)Gd2TiFe9 cuboctahedra, faces with two equivalent Fe(4)Gd2Fe8Si2 cuboctahedra, faces with two equivalent Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, faces with two equivalent Si(1)Gd2TiFe7Si2 cuboctahedra, and faces with four equivalent Fe(5)Gd2TiFe9 cuboctahedra. is represented by the CIF file [CIF]
data_GdTiFe9Si2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.806
_cell_length_b   6.301
_cell_length_c   6.383
_cell_angle_alpha   98.355
_cell_angle_beta   112.119
_cell_angle_gamma   67.580
_symmetry_Int_Tables_number   1
_cell_volume   165.548
_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
  Gd  Gd0  1  0.001  0.003  0.005  1.0
  Ti  Ti1  1  0.996  0.631  0.623  1.0
  Fe  Fe2  1  0.712  0.787  0.212  1.0
  Fe  Fe3  1  0.283  0.218  0.784  1.0
  Fe  Fe4  1  0.501  0.774  0.776  1.0
  Fe  Fe5  1  0.502  0.225  0.229  1.0
  Fe  Fe6  1  0.497  0.004  0.501  1.0
  Fe  Fe7  1  0.001  0.004  0.501  1.0
  Fe  Fe8  1  0.644  0.362  0.650  1.0
  Fe  Fe9  1  0.358  0.640  0.357  1.0
  Fe  Fe10  1  0.996  0.357  0.349  1.0
  Si  Si11  1  0.506  0.497  0.007  1.0
  Si  Si12  1  0.003  0.497  0.007  1.0
[/CIF]
.
The compound described by GdTiFe9Si2 crystallizes in the monoclinic Cm space group. Gd(1) is bonded in a 20-coordinate geometry to one Ti(1), one Fe(6), one Fe(7), one Fe(8), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(4), four equivalent Fe(5), and four equivalent Si(1) atoms. Ti(1) is bonded in a 14-coordinate geometry to one Gd(1), one Fe(1), one Fe(2), one Fe(8), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(6), two equivalent Fe(7), and two equivalent Si(1) atoms. There are eight inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to two equivalent Gd(1), one Ti(1), one Fe(3), one Fe(4), one Fe(8), two equivalent Fe(5), two equivalent Fe(7), and two equivalent Si(1) atoms. In the second Fe site, Fe(2) is bonded in a 12-coordinate geometry to two equivalent Gd(1), one Ti(1), one Fe(3), one Fe(4), one Fe(8), two equivalent Fe(5), two equivalent Fe(6), and two equivalent Si(1) atoms. In the third Fe site, Fe(3) is bonded to two equivalent Gd(1), two equivalent Ti(1), one Fe(1), one Fe(2), one Fe(6), one Fe(7), two equivalent Fe(5), and two equivalent Si(1) atoms to form distorted FeGd2Ti2Fe6Si2 cuboctahedra that share corners with four equivalent Fe(5)Gd2TiFe9 cuboctahedra, corners with four equivalent Si(1)Gd2TiFe7Si2 cuboctahedra, corners with six equivalent Fe(4)Gd2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(4)Gd2Fe8Si2 cuboctahedra, edges with two equivalent Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, edges with two equivalent Fe(5)Gd2TiFe9 cuboctahedra, edges with two equivalent Si(1)Gd2TiFe7Si2 cuboctahedra,  a faceface with one Fe(4)Gd2Fe8Si2 cuboctahedra, faces with four equivalent Fe(5)Gd2TiFe9 cuboctahedra, and faces with four equivalent Si(1)Gd2TiFe7Si2 cuboctahedra. In the fourth Fe site, Fe(4) is bonded to two equivalent Gd(1), one Fe(1), one Fe(2), one Fe(6), one Fe(7), two equivalent Fe(5), two equivalent Fe(8), and two equivalent Si(1) atoms to form distorted FeGd2Fe8Si2 cuboctahedra that share corners with four equivalent Fe(5)Gd2TiFe9 cuboctahedra, corners with four equivalent Si(1)Gd2TiFe7Si2 cuboctahedra, corners with six equivalent Fe(3)Gd2Ti2Fe6Si2 cuboctahedra,  an edgeedge with one Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, edges with two equivalent Fe(4)Gd2Fe8Si2 cuboctahedra, edges with two equivalent Fe(5)Gd2TiFe9 cuboctahedra, edges with two equivalent Si(1)Gd2TiFe7Si2 cuboctahedra,  a faceface with one Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, faces with four equivalent Fe(5)Gd2TiFe9 cuboctahedra, and faces with four equivalent Si(1)Gd2TiFe7Si2 cuboctahedra. In the fifth Fe site, Fe(5) is bonded to two equivalent Gd(1), one Ti(1), one Fe(1), one Fe(2), one Fe(3), one Fe(4), one Fe(6), one Fe(7), one Fe(8), and two equivalent Fe(5) atoms to form distorted FeGd2TiFe9 cuboctahedra that share corners with two equivalent Fe(4)Gd2Fe8Si2 cuboctahedra, corners with two equivalent Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, corners with four equivalent Si(1)Gd2TiFe7Si2 cuboctahedra, corners with six equivalent Fe(5)Gd2TiFe9 cuboctahedra,  an edgeedge with one Fe(4)Gd2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, edges with four equivalent Si(1)Gd2TiFe7Si2 cuboctahedra, faces with two equivalent Fe(4)Gd2Fe8Si2 cuboctahedra, faces with two equivalent Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, faces with two equivalent Fe(5)Gd2TiFe9 cuboctahedra, and faces with four equivalent Si(1)Gd2TiFe7Si2 cuboctahedra. In the sixth Fe site, Fe(6) is bonded in a 12-coordinate geometry to one Gd(1), two equivalent Ti(1), one Fe(3), one Fe(4), one Fe(7), two equivalent Fe(2), two equivalent Fe(5), and two equivalent Si(1) atoms. In the seventh Fe site, Fe(7) is bonded in a 14-coordinate geometry to one Gd(1), two equivalent Ti(1), one Fe(3), one Fe(4), one Fe(6), two equivalent Fe(1), two equivalent Fe(5), two equivalent Fe(8), and two equivalent Si(1) atoms. In the eighth Fe site, Fe(8) is bonded in a 1-coordinate geometry to one Gd(1), one Ti(1), one Fe(1), one Fe(2), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(7), and two equivalent Si(1) atoms. Si(1) is bonded to two equivalent Gd(1), one Ti(1), one Fe(1), one Fe(2), one Fe(3), one Fe(4), one Fe(6), one Fe(7), one Fe(8), and two equivalent Si(1) atoms to form distorted SiGd2TiFe7Si2 cuboctahedra that share corners with two equivalent Fe(4)Gd2Fe8Si2 cuboctahedra, corners with two equivalent Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, corners with four equivalent Fe(5)Gd2TiFe9 cuboctahedra, corners with six equivalent Si(1)Gd2TiFe7Si2 cuboctahedra,  an edgeedge with one Fe(4)Gd2Fe8Si2 cuboctahedra,  an edgeedge with one Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, edges with four equivalent Fe(5)Gd2TiFe9 cuboctahedra, faces with two equivalent Fe(4)Gd2Fe8Si2 cuboctahedra, faces with two equivalent Fe(3)Gd2Ti2Fe6Si2 cuboctahedra, faces with two equivalent Si(1)Gd2TiFe7Si2 cuboctahedra, and faces with four equivalent Fe(5)Gd2TiFe9 cuboctahedra. is represented by the CIF file [CIF]
data_GdTiFe9Si2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.806
_cell_length_b   6.301
_cell_length_c   6.383
_cell_angle_alpha   98.355
_cell_angle_beta   112.119
_cell_angle_gamma   67.580
_symmetry_Int_Tables_number   1
_cell_volume   165.548
_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
  Gd  Gd0  1  0.001  0.003  0.005  1.0
  Ti  Ti1  1  0.996  0.631  0.623  1.0
  Fe  Fe2  1  0.712  0.787  0.212  1.0
  Fe  Fe3  1  0.283  0.218  0.784  1.0
  Fe  Fe4  1  0.501  0.774  0.776  1.0
  Fe  Fe5  1  0.502  0.225  0.229  1.0
  Fe  Fe6  1  0.497  0.004  0.501  1.0
  Fe  Fe7  1  0.001  0.004  0.501  1.0
  Fe  Fe8  1  0.644  0.362  0.650  1.0
  Fe  Fe9  1  0.358  0.640  0.357  1.0
  Fe  Fe10  1  0.996  0.357  0.349  1.0
  Si  Si11  1  0.506  0.497  0.007  1.0
  Si  Si12  1  0.003  0.497  0.007  1.0
[/CIF]
.