The compound described by LiTb4Al2(FeO6)2 crystallizes in the triclinic P1 space group. Li(1) is bonded in a 4-coordinate geometry to one O(11), one O(12), one O(2), and one O(6) atom. There are four inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(5), one O(8), and one O(9) atom. In the second Tb site, Tb(2) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(5), one O(6), and one O(9) atom. In the third Tb site, Tb(3) is bonded in a 7-coordinate geometry to one O(10), one O(3), one O(4), one O(6), one O(7), one O(8), and one O(9) atom. In the fourth Tb site, Tb(4) is bonded in a 7-coordinate geometry to one O(10), one O(3), one O(4), one O(5), one O(7), one O(8), and one O(9) atom. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(12), one O(4), one O(5), one O(8), and one O(9) atom to form distorted FeO5 trigonal bipyramids that share corners with four equivalent Al(2)O6 octahedra and  a cornercorner with one Al(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 15-56°. In the second Fe site, Fe(2) is bonded to one O(10), one O(11), one O(3), one O(6), and one O(7) atom to form FeO5 trigonal bipyramids that share  a cornercorner with one Al(2)O6 octahedra and corners with three equivalent Al(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 38°. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(10), one O(2), one O(4), one O(6), and one O(7) atom to form distorted AlO5 trigonal bipyramids that share  a cornercorner with one Fe(1)O5 trigonal bipyramid and corners with three equivalent Fe(2)O5 trigonal bipyramids. In the second Al site, Al(2) is bonded to one O(1), one O(12), one O(3), one O(5), one O(8), and one O(9) atom to form AlO6 octahedra that share  a cornercorner with one Fe(2)O5 trigonal bipyramid and corners with four equivalent Fe(1)O5 trigonal bipyramids. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Tb(1), one Tb(2), and one Al(2) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Tb(1), one Tb(2), and one Al(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Tb(3), one Tb(4), one Fe(2), and one Al(2) atom. In the fourth O site, O(4) is bonded to one Tb(3), one Tb(4), one Fe(1), and one Al(1) atom to form distorted OTb2AlFe tetrahedra that share  a cornercorner with one O(8)Tb3AlFe trigonal bipyramid, corners with three equivalent O(7)Tb2AlFe trigonal pyramids, and  an edgeedge with one O(8)Tb3AlFe trigonal bipyramid. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(2), one Tb(4), one Fe(1), and one Al(2) atom. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Li(1), one Tb(2), one Tb(3), one Fe(2), and one Al(1) atom. In the seventh O site, O(7) is bonded to one Tb(3), one Tb(4), one Fe(2), and one Al(1) atom to form distorted OTb2AlFe trigonal pyramids that share  a cornercorner with one O(11)LiTb2Fe tetrahedra, corners with three equivalent O(4)Tb2AlFe tetrahedra, and corners with two equivalent O(8)Tb3AlFe trigonal bipyramids. In the eighth O site, O(8) is bonded to one Tb(1), one Tb(3), one Tb(4), one Fe(1), and one Al(2) atom to form distorted OTb3AlFe trigonal bipyramids that share  a cornercorner with one O(11)LiTb2Fe tetrahedra,  a cornercorner with one O(4)Tb2AlFe tetrahedra, corners with two equivalent O(7)Tb2AlFe trigonal pyramids, and  an edgeedge with one O(4)Tb2AlFe tetrahedra. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to one Tb(1), one Tb(2), one Tb(3), one Tb(4), one Fe(1), and one Al(2) atom. In the tenth O site, O(10) is bonded in a distorted see-saw-like geometry to one Tb(3), one Tb(4), one Fe(2), and one Al(1) atom. In the eleventh O site, O(11) is bonded to one Li(1), one Tb(1), one Tb(2), and one Fe(2) atom to form distorted OLiTb2Fe tetrahedra that share  a cornercorner with one O(8)Tb3AlFe trigonal bipyramid and  a cornercorner with one O(7)Tb2AlFe trigonal pyramid. In the twelfth O site, O(12) is bonded in a 5-coordinate geometry to one Li(1), one Tb(1), one Tb(2), one Fe(1), and one Al(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_LiTb4Al2(FeO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.450
_cell_length_b   5.660
_cell_length_c   8.433
_cell_angle_alpha   97.448
_cell_angle_beta   82.441
_cell_angle_gamma   95.774
_symmetry_Int_Tables_number   1
_cell_volume   254.791
_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
  Li  Li0  1  0.785  0.488  0.337  1.0
  Tb  Tb1  1  0.429  0.611  0.170  1.0
  Tb  Tb2  1  0.951  0.064  0.218  1.0
  Tb  Tb3  1  0.497  0.441  0.739  1.0
  Tb  Tb4  1  0.042  0.925  0.779  1.0
  Al  Al5  1  0.071  0.413  0.535  1.0
  Al  Al6  1  0.502  0.032  0.990  1.0
  Fe  Fe7  1  0.977  0.494  0.964  1.0
  Fe  Fe8  1  0.533  0.966  0.531  1.0
  O  O9  1  0.335  0.982  0.196  1.0
  O  O10  1  0.121  0.446  0.320  1.0
  O  O11  1  0.636  0.037  0.761  1.0
  O  O12  1  0.899  0.533  0.729  1.0
  O  O13  1  0.772  0.842  0.010  1.0
  O  O14  1  0.755  0.253  0.480  1.0
  O  O15  1  0.235  0.175  0.591  1.0
  O  O16  1  0.295  0.713  0.928  1.0
  O  O17  1  0.246  0.225  0.950  1.0
  O  O18  1  0.313  0.676  0.588  1.0
  O  O19  1  0.701  0.785  0.347  1.0
  O  O20  1  0.705  0.315  0.087  1.0
[/CIF]
.
The compound described by LiTb4Al2(FeO6)2 crystallizes in the triclinic P1 space group. Li(1) is bonded in a 4-coordinate geometry to one O(11), one O(12), one O(2), and one O(6) atom. There are four inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(5), one O(8), and one O(9) atom. In the second Tb site, Tb(2) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(5), one O(6), and one O(9) atom. In the third Tb site, Tb(3) is bonded in a 7-coordinate geometry to one O(10), one O(3), one O(4), one O(6), one O(7), one O(8), and one O(9) atom. In the fourth Tb site, Tb(4) is bonded in a 7-coordinate geometry to one O(10), one O(3), one O(4), one O(5), one O(7), one O(8), and one O(9) atom. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(12), one O(4), one O(5), one O(8), and one O(9) atom to form distorted FeO5 trigonal bipyramids that share corners with four equivalent Al(2)O6 octahedra and  a cornercorner with one Al(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 15-56°. In the second Fe site, Fe(2) is bonded to one O(10), one O(11), one O(3), one O(6), and one O(7) atom to form FeO5 trigonal bipyramids that share  a cornercorner with one Al(2)O6 octahedra and corners with three equivalent Al(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 38°. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(10), one O(2), one O(4), one O(6), and one O(7) atom to form distorted AlO5 trigonal bipyramids that share  a cornercorner with one Fe(1)O5 trigonal bipyramid and corners with three equivalent Fe(2)O5 trigonal bipyramids. In the second Al site, Al(2) is bonded to one O(1), one O(12), one O(3), one O(5), one O(8), and one O(9) atom to form AlO6 octahedra that share  a cornercorner with one Fe(2)O5 trigonal bipyramid and corners with four equivalent Fe(1)O5 trigonal bipyramids. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Tb(1), one Tb(2), and one Al(2) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Tb(1), one Tb(2), and one Al(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Tb(3), one Tb(4), one Fe(2), and one Al(2) atom. In the fourth O site, O(4) is bonded to one Tb(3), one Tb(4), one Fe(1), and one Al(1) atom to form distorted OTb2AlFe tetrahedra that share  a cornercorner with one O(8)Tb3AlFe trigonal bipyramid, corners with three equivalent O(7)Tb2AlFe trigonal pyramids, and  an edgeedge with one O(8)Tb3AlFe trigonal bipyramid. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Tb(1), one Tb(2), one Tb(4), one Fe(1), and one Al(2) atom. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Li(1), one Tb(2), one Tb(3), one Fe(2), and one Al(1) atom. In the seventh O site, O(7) is bonded to one Tb(3), one Tb(4), one Fe(2), and one Al(1) atom to form distorted OTb2AlFe trigonal pyramids that share  a cornercorner with one O(11)LiTb2Fe tetrahedra, corners with three equivalent O(4)Tb2AlFe tetrahedra, and corners with two equivalent O(8)Tb3AlFe trigonal bipyramids. In the eighth O site, O(8) is bonded to one Tb(1), one Tb(3), one Tb(4), one Fe(1), and one Al(2) atom to form distorted OTb3AlFe trigonal bipyramids that share  a cornercorner with one O(11)LiTb2Fe tetrahedra,  a cornercorner with one O(4)Tb2AlFe tetrahedra, corners with two equivalent O(7)Tb2AlFe trigonal pyramids, and  an edgeedge with one O(4)Tb2AlFe tetrahedra. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to one Tb(1), one Tb(2), one Tb(3), one Tb(4), one Fe(1), and one Al(2) atom. In the tenth O site, O(10) is bonded in a distorted see-saw-like geometry to one Tb(3), one Tb(4), one Fe(2), and one Al(1) atom. In the eleventh O site, O(11) is bonded to one Li(1), one Tb(1), one Tb(2), and one Fe(2) atom to form distorted OLiTb2Fe tetrahedra that share  a cornercorner with one O(8)Tb3AlFe trigonal bipyramid and  a cornercorner with one O(7)Tb2AlFe trigonal pyramid. In the twelfth O site, O(12) is bonded in a 5-coordinate geometry to one Li(1), one Tb(1), one Tb(2), one Fe(1), and one Al(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_LiTb4Al2(FeO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.450
_cell_length_b   5.660
_cell_length_c   8.433
_cell_angle_alpha   97.448
_cell_angle_beta   82.441
_cell_angle_gamma   95.774
_symmetry_Int_Tables_number   1
_cell_volume   254.791
_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
  Li  Li0  1  0.785  0.488  0.337  1.0
  Tb  Tb1  1  0.429  0.611  0.170  1.0
  Tb  Tb2  1  0.951  0.064  0.218  1.0
  Tb  Tb3  1  0.497  0.441  0.739  1.0
  Tb  Tb4  1  0.042  0.925  0.779  1.0
  Al  Al5  1  0.071  0.413  0.535  1.0
  Al  Al6  1  0.502  0.032  0.990  1.0
  Fe  Fe7  1  0.977  0.494  0.964  1.0
  Fe  Fe8  1  0.533  0.966  0.531  1.0
  O  O9  1  0.335  0.982  0.196  1.0
  O  O10  1  0.121  0.446  0.320  1.0
  O  O11  1  0.636  0.037  0.761  1.0
  O  O12  1  0.899  0.533  0.729  1.0
  O  O13  1  0.772  0.842  0.010  1.0
  O  O14  1  0.755  0.253  0.480  1.0
  O  O15  1  0.235  0.175  0.591  1.0
  O  O16  1  0.295  0.713  0.928  1.0
  O  O17  1  0.246  0.225  0.950  1.0
  O  O18  1  0.313  0.676  0.588  1.0
  O  O19  1  0.701  0.785  0.347  1.0
  O  O20  1  0.705  0.315  0.087  1.0
[/CIF]
.