The structure described by MgTb5(MoO6)2 crystallizes in the monoclinic C2/m space group. Mg(1) is bonded to two equivalent O(4) and four equivalent O(2) atoms to form MgO6 octahedra that share corners with four equivalent Mo(1)O6 octahedra and edges with two equivalent Tb(3)O6 octahedra. The corner-sharing octahedral tilt angles are 43°. There are three inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(1), and four equivalent O(2) atoms. In the second Tb site, Tb(2) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(2), and four equivalent O(1) atoms. In the third Tb site, Tb(3) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form TbO6 octahedra that share corners with four equivalent Mo(1)O6 octahedra and edges with two equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 49°. Mo(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form MoO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Tb(3)O6 octahedra, and edges with two equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-49°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Tb(1), two equivalent Tb(2), and one Mo(1) atom to form OTb3Mo tetrahedra that share corners with four equivalent O(1)Tb3Mo tetrahedra,  a cornercorner with one O(4)Tb2MgMo2 trigonal bipyramid, corners with six equivalent O(2)Tb4Mg trigonal bipyramids, edges with two equivalent O(1)Tb3Mo tetrahedra,  an edgeedge with one O(2)Tb4Mg trigonal bipyramid, and edges with two equivalent O(4)Tb2MgMo2 trigonal bipyramids. In the second O site, O(2) is bonded to one Mg(1), one Tb(2), one Tb(3), and two equivalent Tb(1) atoms to form OTb4Mg trigonal bipyramids that share corners with six equivalent O(1)Tb3Mo tetrahedra,  a cornercorner with one O(4)Tb2MgMo2 trigonal bipyramid, corners with four equivalent O(2)Tb4Mg trigonal bipyramids,  an edgeedge with one O(1)Tb3Mo tetrahedra, edges with two equivalent O(4)Tb2MgMo2 trigonal bipyramids, edges with three equivalent O(2)Tb4Mg trigonal bipyramids, and  a faceface with one O(2)Tb4Mg trigonal bipyramid. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Tb(3) and two equivalent Mo(1) atoms. In the fourth O site, O(4) is bonded to one Mg(1), one Tb(1), one Tb(2), and two equivalent Mo(1) atoms to form distorted OTb2MgMo2 trigonal bipyramids that share corners with two equivalent O(1)Tb3Mo tetrahedra,  a cornercorner with one O(4)Tb2MgMo2 trigonal bipyramid, corners with two equivalent O(2)Tb4Mg trigonal bipyramids, edges with four equivalent O(1)Tb3Mo tetrahedra,  an edgeedge with one O(4)Tb2MgMo2 trigonal bipyramid, and edges with four equivalent O(2)Tb4Mg trigonal bipyramids. is represented by the CIF file [CIF]
data_Tb5Mg(MoO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.067
_cell_length_b   6.994
_cell_length_c   7.287
_cell_angle_alpha   104.777
_cell_angle_beta   90.000
_cell_angle_gamma   115.705
_symmetry_Int_Tables_number   1
_cell_volume   267.227
_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
  Tb  Tb0  1  0.288  0.577  0.642  1.0
  Tb  Tb1  1  0.712  0.423  0.358  1.0
  Tb  Tb2  1  0.297  0.594  0.143  1.0
  Tb  Tb3  1  0.703  0.406  0.857  1.0
  Tb  Tb4  1  0.000  0.000  0.500  1.0
  Mg  Mg5  1  0.500  0.000  0.500  1.0
  Mo  Mo6  1  0.745  0.000  0.000  1.0
  Mo  Mo7  1  0.255  0.000  0.000  1.0
  O  O8  1  0.901  0.349  0.102  1.0
  O  O9  1  0.448  0.349  0.102  1.0
  O  O10  1  0.099  0.651  0.898  1.0
  O  O11  1  0.552  0.651  0.898  1.0
  O  O12  1  0.128  0.722  0.440  1.0
  O  O13  1  0.594  0.722  0.440  1.0
  O  O14  1  0.872  0.278  0.560  1.0
  O  O15  1  0.406  0.278  0.560  1.0
  O  O16  1  0.992  0.985  0.185  1.0
  O  O17  1  0.008  0.015  0.815  1.0
  O  O18  1  0.497  0.994  0.214  1.0
  O  O19  1  0.503  0.006  0.786  1.0
[/CIF]
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The structure described by MgTb5(MoO6)2 crystallizes in the monoclinic C2/m space group. Mg(1) is bonded to two equivalent O(4) and four equivalent O(2) atoms to form MgO6 octahedra that share corners with four equivalent Mo(1)O6 octahedra and edges with two equivalent Tb(3)O6 octahedra. The corner-sharing octahedral tilt angles are 43°. There are three inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(1), and four equivalent O(2) atoms. In the second Tb site, Tb(2) is bonded in a 7-coordinate geometry to one O(4), two equivalent O(2), and four equivalent O(1) atoms. In the third Tb site, Tb(3) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form TbO6 octahedra that share corners with four equivalent Mo(1)O6 octahedra and edges with two equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 49°. Mo(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form MoO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Tb(3)O6 octahedra, and edges with two equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-49°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Tb(1), two equivalent Tb(2), and one Mo(1) atom to form OTb3Mo tetrahedra that share corners with four equivalent O(1)Tb3Mo tetrahedra,  a cornercorner with one O(4)Tb2MgMo2 trigonal bipyramid, corners with six equivalent O(2)Tb4Mg trigonal bipyramids, edges with two equivalent O(1)Tb3Mo tetrahedra,  an edgeedge with one O(2)Tb4Mg trigonal bipyramid, and edges with two equivalent O(4)Tb2MgMo2 trigonal bipyramids. In the second O site, O(2) is bonded to one Mg(1), one Tb(2), one Tb(3), and two equivalent Tb(1) atoms to form OTb4Mg trigonal bipyramids that share corners with six equivalent O(1)Tb3Mo tetrahedra,  a cornercorner with one O(4)Tb2MgMo2 trigonal bipyramid, corners with four equivalent O(2)Tb4Mg trigonal bipyramids,  an edgeedge with one O(1)Tb3Mo tetrahedra, edges with two equivalent O(4)Tb2MgMo2 trigonal bipyramids, edges with three equivalent O(2)Tb4Mg trigonal bipyramids, and  a faceface with one O(2)Tb4Mg trigonal bipyramid. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Tb(3) and two equivalent Mo(1) atoms. In the fourth O site, O(4) is bonded to one Mg(1), one Tb(1), one Tb(2), and two equivalent Mo(1) atoms to form distorted OTb2MgMo2 trigonal bipyramids that share corners with two equivalent O(1)Tb3Mo tetrahedra,  a cornercorner with one O(4)Tb2MgMo2 trigonal bipyramid, corners with two equivalent O(2)Tb4Mg trigonal bipyramids, edges with four equivalent O(1)Tb3Mo tetrahedra,  an edgeedge with one O(4)Tb2MgMo2 trigonal bipyramid, and edges with four equivalent O(2)Tb4Mg trigonal bipyramids. is represented by the CIF file [CIF]
data_Tb5Mg(MoO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.067
_cell_length_b   6.994
_cell_length_c   7.287
_cell_angle_alpha   104.777
_cell_angle_beta   90.000
_cell_angle_gamma   115.705
_symmetry_Int_Tables_number   1
_cell_volume   267.227
_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
  Tb  Tb0  1  0.288  0.577  0.642  1.0
  Tb  Tb1  1  0.712  0.423  0.358  1.0
  Tb  Tb2  1  0.297  0.594  0.143  1.0
  Tb  Tb3  1  0.703  0.406  0.857  1.0
  Tb  Tb4  1  0.000  0.000  0.500  1.0
  Mg  Mg5  1  0.500  0.000  0.500  1.0
  Mo  Mo6  1  0.745  0.000  0.000  1.0
  Mo  Mo7  1  0.255  0.000  0.000  1.0
  O  O8  1  0.901  0.349  0.102  1.0
  O  O9  1  0.448  0.349  0.102  1.0
  O  O10  1  0.099  0.651  0.898  1.0
  O  O11  1  0.552  0.651  0.898  1.0
  O  O12  1  0.128  0.722  0.440  1.0
  O  O13  1  0.594  0.722  0.440  1.0
  O  O14  1  0.872  0.278  0.560  1.0
  O  O15  1  0.406  0.278  0.560  1.0
  O  O16  1  0.992  0.985  0.185  1.0
  O  O17  1  0.008  0.015  0.815  1.0
  O  O18  1  0.497  0.994  0.214  1.0
  O  O19  1  0.503  0.006  0.786  1.0
[/CIF]
.