The structure described by Mg7Sm4Ge6 crystallizes in the monoclinic C2/m space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Ge(2) and two equivalent Ge(3) atoms to form distorted MgGe4 tetrahedra that share corners with four equivalent Sm(2)Ge6 octahedra, corners with two equivalent Mg(1)Ge4 tetrahedra, corners with two equivalent Mg(2)Ge4 tetrahedra, corners with two equivalent Mg(3)Ge4 tetrahedra, edges with two equivalent Sm(2)Ge6 octahedra,  an edgeedge with one Mg(1)Ge4 tetrahedra,  an edgeedge with one Mg(2)Ge4 tetrahedra, and edges with two equivalent Mg(3)Ge4 tetrahedra. The corner-sharing octahedral tilt angles range from 10-58°. In the second Mg site, Mg(2) is bonded to two equivalent Ge(1) and two equivalent Ge(3) atoms to form distorted MgGe4 tetrahedra that share corners with two equivalent Sm(2)Ge6 octahedra, corners with two equivalent Mg(1)Ge4 tetrahedra, corners with two equivalent Mg(2)Ge4 tetrahedra, corners with four equivalent Mg(3)Ge4 tetrahedra, edges with two equivalent Sm(2)Ge6 octahedra,  an edgeedge with one Mg(1)Ge4 tetrahedra, and  an edgeedge with one Mg(2)Ge4 tetrahedra. The corner-sharing octahedral tilt angles are 46°. In the third Mg site, Mg(3) is bonded to one Ge(1), one Ge(3), and two equivalent Ge(2) atoms to form distorted MgGe4 tetrahedra that share corners with three equivalent Sm(2)Ge6 octahedra, corners with two equivalent Mg(1)Ge4 tetrahedra, corners with two equivalent Mg(3)Ge4 tetrahedra, corners with four equivalent Mg(2)Ge4 tetrahedra, edges with three equivalent Sm(2)Ge6 octahedra, and edges with two equivalent Mg(1)Ge4 tetrahedra. The corner-sharing octahedral tilt angles range from 15-64°. In the fourth Mg site, Mg(4) is bonded in a distorted square co-planar geometry to four equivalent Ge(1) atoms. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 5-coordinate geometry to two equivalent Ge(1) and three equivalent Ge(3) atoms. In the second Sm site, Sm(2) is bonded to one Ge(3), two equivalent Ge(1), and three equivalent Ge(2) atoms to form distorted SmGe6 octahedra that share corners with two equivalent Mg(2)Ge4 tetrahedra, corners with three equivalent Mg(3)Ge4 tetrahedra, corners with four equivalent Mg(1)Ge4 tetrahedra, edges with four equivalent Sm(2)Ge6 octahedra, edges with two equivalent Mg(1)Ge4 tetrahedra, edges with two equivalent Mg(2)Ge4 tetrahedra, and edges with three equivalent Mg(3)Ge4 tetrahedra. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to one Mg(3), two equivalent Mg(2), two equivalent Mg(4), two equivalent Sm(1), and two equivalent Sm(2) atoms. In the second Ge site, Ge(2) is bonded in a 7-coordinate geometry to two equivalent Mg(1), two equivalent Mg(3), and three equivalent Sm(2) atoms. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to one Mg(3), two equivalent Mg(1), two equivalent Mg(2), one Sm(2), and three equivalent Sm(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sm4Mg7Ge6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.413
_cell_length_b   8.562
_cell_length_c   10.890
_cell_angle_alpha   78.743
_cell_angle_beta   78.309
_cell_angle_gamma   75.065
_symmetry_Int_Tables_number   1
_cell_volume   384.837
_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
  Sm  Sm0  1  0.733  0.147  0.387  1.0
  Sm  Sm1  1  0.267  0.853  0.613  1.0
  Sm  Sm2  1  0.630  0.579  0.161  1.0
  Sm  Sm3  1  0.370  0.421  0.839  1.0
  Mg  Mg4  1  0.960  0.942  0.139  1.0
  Mg  Mg5  1  0.040  0.058  0.861  1.0
  Mg  Mg6  1  0.937  0.729  0.397  1.0
  Mg  Mg7  1  0.063  0.271  0.603  1.0
  Mg  Mg8  1  0.310  0.228  0.153  1.0
  Mg  Mg9  1  0.690  0.772  0.847  1.0
  Mg  Mg10  1  0.500  0.500  0.500  1.0
  Ge  Ge11  1  0.879  0.589  0.653  1.0
  Ge  Ge12  1  0.121  0.411  0.347  1.0
  Ge  Ge13  1  0.850  0.279  0.021  1.0
  Ge  Ge14  1  0.150  0.721  0.979  1.0
  Ge  Ge15  1  0.389  0.908  0.314  1.0
  Ge  Ge16  1  0.611  0.092  0.686  1.0
[/CIF]
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The structure described by Mg7Sm4Ge6 crystallizes in the monoclinic C2/m space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Ge(2) and two equivalent Ge(3) atoms to form distorted MgGe4 tetrahedra that share corners with four equivalent Sm(2)Ge6 octahedra, corners with two equivalent Mg(1)Ge4 tetrahedra, corners with two equivalent Mg(2)Ge4 tetrahedra, corners with two equivalent Mg(3)Ge4 tetrahedra, edges with two equivalent Sm(2)Ge6 octahedra,  an edgeedge with one Mg(1)Ge4 tetrahedra,  an edgeedge with one Mg(2)Ge4 tetrahedra, and edges with two equivalent Mg(3)Ge4 tetrahedra. The corner-sharing octahedral tilt angles range from 10-58°. In the second Mg site, Mg(2) is bonded to two equivalent Ge(1) and two equivalent Ge(3) atoms to form distorted MgGe4 tetrahedra that share corners with two equivalent Sm(2)Ge6 octahedra, corners with two equivalent Mg(1)Ge4 tetrahedra, corners with two equivalent Mg(2)Ge4 tetrahedra, corners with four equivalent Mg(3)Ge4 tetrahedra, edges with two equivalent Sm(2)Ge6 octahedra,  an edgeedge with one Mg(1)Ge4 tetrahedra, and  an edgeedge with one Mg(2)Ge4 tetrahedra. The corner-sharing octahedral tilt angles are 46°. In the third Mg site, Mg(3) is bonded to one Ge(1), one Ge(3), and two equivalent Ge(2) atoms to form distorted MgGe4 tetrahedra that share corners with three equivalent Sm(2)Ge6 octahedra, corners with two equivalent Mg(1)Ge4 tetrahedra, corners with two equivalent Mg(3)Ge4 tetrahedra, corners with four equivalent Mg(2)Ge4 tetrahedra, edges with three equivalent Sm(2)Ge6 octahedra, and edges with two equivalent Mg(1)Ge4 tetrahedra. The corner-sharing octahedral tilt angles range from 15-64°. In the fourth Mg site, Mg(4) is bonded in a distorted square co-planar geometry to four equivalent Ge(1) atoms. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 5-coordinate geometry to two equivalent Ge(1) and three equivalent Ge(3) atoms. In the second Sm site, Sm(2) is bonded to one Ge(3), two equivalent Ge(1), and three equivalent Ge(2) atoms to form distorted SmGe6 octahedra that share corners with two equivalent Mg(2)Ge4 tetrahedra, corners with three equivalent Mg(3)Ge4 tetrahedra, corners with four equivalent Mg(1)Ge4 tetrahedra, edges with four equivalent Sm(2)Ge6 octahedra, edges with two equivalent Mg(1)Ge4 tetrahedra, edges with two equivalent Mg(2)Ge4 tetrahedra, and edges with three equivalent Mg(3)Ge4 tetrahedra. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to one Mg(3), two equivalent Mg(2), two equivalent Mg(4), two equivalent Sm(1), and two equivalent Sm(2) atoms. In the second Ge site, Ge(2) is bonded in a 7-coordinate geometry to two equivalent Mg(1), two equivalent Mg(3), and three equivalent Sm(2) atoms. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to one Mg(3), two equivalent Mg(1), two equivalent Mg(2), one Sm(2), and three equivalent Sm(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sm4Mg7Ge6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.413
_cell_length_b   8.562
_cell_length_c   10.890
_cell_angle_alpha   78.743
_cell_angle_beta   78.309
_cell_angle_gamma   75.065
_symmetry_Int_Tables_number   1
_cell_volume   384.837
_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
  Sm  Sm0  1  0.733  0.147  0.387  1.0
  Sm  Sm1  1  0.267  0.853  0.613  1.0
  Sm  Sm2  1  0.630  0.579  0.161  1.0
  Sm  Sm3  1  0.370  0.421  0.839  1.0
  Mg  Mg4  1  0.960  0.942  0.139  1.0
  Mg  Mg5  1  0.040  0.058  0.861  1.0
  Mg  Mg6  1  0.937  0.729  0.397  1.0
  Mg  Mg7  1  0.063  0.271  0.603  1.0
  Mg  Mg8  1  0.310  0.228  0.153  1.0
  Mg  Mg9  1  0.690  0.772  0.847  1.0
  Mg  Mg10  1  0.500  0.500  0.500  1.0
  Ge  Ge11  1  0.879  0.589  0.653  1.0
  Ge  Ge12  1  0.121  0.411  0.347  1.0
  Ge  Ge13  1  0.850  0.279  0.021  1.0
  Ge  Ge14  1  0.150  0.721  0.979  1.0
  Ge  Ge15  1  0.389  0.908  0.314  1.0
  Ge  Ge16  1  0.611  0.092  0.686  1.0
[/CIF]
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