The crystal structure described by Mg3Tb7Ge8 crystallizes in the monoclinic P2_1 space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to one Ge(3), one Ge(6), one Ge(7), and two equivalent Ge(1) atoms. In the second Mg site, Mg(2) is bonded in a 5-coordinate geometry to one Ge(4), one Ge(5), one Ge(8), and two equivalent Ge(2) atoms. In the third Mg site, Mg(3) is bonded in a 6-coordinate geometry to one Ge(1), one Ge(5), one Ge(6), one Ge(7), and two equivalent Ge(3) atoms. There are seven inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 7-coordinate geometry to one Ge(3), one Ge(5), one Ge(6), one Ge(7), one Ge(8), and two equivalent Ge(1) atoms. In the second Tb site, Tb(2) is bonded in a 7-coordinate geometry to one Ge(4), one Ge(5), one Ge(6), one Ge(7), one Ge(8), and two equivalent Ge(2) atoms. In the third Tb site, Tb(3) is bonded in a 7-coordinate geometry to one Ge(4), one Ge(5), one Ge(6), one Ge(7), one Ge(8), and two equivalent Ge(2) atoms. In the fourth Tb site, Tb(4) is bonded in a 7-coordinate geometry to one Ge(3), one Ge(5), one Ge(6), one Ge(7), one Ge(8), and two equivalent Ge(1) atoms. In the fifth Tb site, Tb(5) is bonded in a 6-coordinate geometry to one Ge(2), one Ge(5), one Ge(6), one Ge(8), and two equivalent Ge(4) atoms. In the sixth Tb site, Tb(6) is bonded in a 6-coordinate geometry to one Ge(2), one Ge(5), one Ge(7), one Ge(8), and two equivalent Ge(4) atoms. In the seventh Tb site, Tb(7) is bonded in a 6-coordinate geometry to one Ge(1), one Ge(6), one Ge(7), one Ge(8), and two equivalent Ge(3) atoms. There are eight inequivalent Ge sites. In the first Ge site, Ge(7) is bonded in a 9-coordinate geometry to one Mg(1), one Mg(3), one Tb(1), one Tb(2), one Tb(3), one Tb(4), one Tb(6), one Tb(7), and one Ge(5) atom. In the second Ge site, Ge(8) is bonded in a 9-coordinate geometry to one Mg(2), one Tb(1), one Tb(2), one Tb(3), one Tb(4), one Tb(5), one Tb(6), one Tb(7), and one Ge(6) atom. In the third Ge site, Ge(1) is bonded in a 9-coordinate geometry to one Mg(3), two equivalent Mg(1), one Tb(7), two equivalent Tb(1), two equivalent Tb(4), and one Ge(3) atom. In the fourth Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Mg(2), one Tb(5), one Tb(6), two equivalent Tb(2), two equivalent Tb(3), and one Ge(4) atom. In the fifth Ge site, Ge(3) is bonded in a 8-coordinate geometry to one Mg(1), two equivalent Mg(3), one Tb(1), one Tb(4), two equivalent Tb(7), and one Ge(1) atom. In the sixth Ge site, Ge(4) is bonded in a 8-coordinate geometry to one Mg(2), one Tb(2), one Tb(3), two equivalent Tb(5), two equivalent Tb(6), and one Ge(2) atom. In the seventh Ge site, Ge(5) is bonded in a 9-coordinate geometry to one Mg(2), one Mg(3), one Tb(1), one Tb(2), one Tb(3), one Tb(4), one Tb(5), one Tb(6), and one Ge(7) atom. In the eighth Ge site, Ge(6) is bonded in a 9-coordinate geometry to one Mg(1), one Mg(3), one Tb(1), one Tb(2), one Tb(3), one Tb(4), one Tb(5), one Tb(7), and one Ge(8) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Tb7Mg3Ge8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.180
_cell_length_b   7.845
_cell_length_c   14.499
_cell_angle_alpha   89.993
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   816.715
_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
  Tb  Tb0  1  0.490  0.934  0.653  1.0
  Tb  Tb1  1  0.990  0.066  0.347  1.0
  Tb  Tb2  1  0.513  0.566  0.156  1.0
  Tb  Tb3  1  0.013  0.434  0.844  1.0
  Tb  Tb4  1  0.511  0.566  0.844  1.0
  Tb  Tb5  1  0.011  0.434  0.156  1.0
  Tb  Tb6  1  0.488  0.935  0.347  1.0
  Tb  Tb7  1  0.988  0.065  0.653  1.0
  Tb  Tb8  1  0.671  0.072  0.125  1.0
  Tb  Tb9  1  0.171  0.928  0.875  1.0
  Tb  Tb10  1  0.670  0.074  0.876  1.0
  Tb  Tb11  1  0.170  0.926  0.124  1.0
  Tb  Tb12  1  0.330  0.431  0.380  1.0
  Tb  Tb13  1  0.830  0.569  0.620  1.0
  Mg  Mg14  1  0.158  0.767  0.499  1.0
  Mg  Mg15  1  0.658  0.233  0.501  1.0
  Mg  Mg16  1  0.840  0.730  1.000  1.0
  Mg  Mg17  1  0.340  0.270  0.000  1.0
  Mg  Mg18  1  0.327  0.428  0.626  1.0
  Mg  Mg19  1  0.827  0.572  0.374  1.0
  Ge  Ge20  1  0.285  0.112  0.500  1.0
  Ge  Ge21  1  0.785  0.888  0.500  1.0
  Ge  Ge22  1  0.713  0.387  1.000  1.0
  Ge  Ge23  1  0.213  0.613  0.000  1.0
  Ge  Ge24  1  0.527  0.658  0.499  1.0
  Ge  Ge25  1  0.027  0.342  0.501  1.0
  Ge  Ge26  1  0.478  0.837  0.999  1.0
  Ge  Ge27  1  0.978  0.163  0.001  1.0
  Ge  Ge28  1  0.332  0.219  0.785  1.0
  Ge  Ge29  1  0.832  0.781  0.215  1.0
  Ge  Ge30  1  0.671  0.286  0.289  1.0
  Ge  Ge31  1  0.171  0.714  0.711  1.0
  Ge  Ge32  1  0.665  0.285  0.712  1.0
  Ge  Ge33  1  0.165  0.715  0.288  1.0
  Ge  Ge34  1  0.331  0.217  0.215  1.0
  Ge  Ge35  1  0.831  0.783  0.785  1.0
[/CIF]
.
The crystal structure described by Mg3Tb7Ge8 crystallizes in the monoclinic P2_1 space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to one Ge(3), one Ge(6), one Ge(7), and two equivalent Ge(1) atoms. In the second Mg site, Mg(2) is bonded in a 5-coordinate geometry to one Ge(4), one Ge(5), one Ge(8), and two equivalent Ge(2) atoms. In the third Mg site, Mg(3) is bonded in a 6-coordinate geometry to one Ge(1), one Ge(5), one Ge(6), one Ge(7), and two equivalent Ge(3) atoms. There are seven inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 7-coordinate geometry to one Ge(3), one Ge(5), one Ge(6), one Ge(7), one Ge(8), and two equivalent Ge(1) atoms. In the second Tb site, Tb(2) is bonded in a 7-coordinate geometry to one Ge(4), one Ge(5), one Ge(6), one Ge(7), one Ge(8), and two equivalent Ge(2) atoms. In the third Tb site, Tb(3) is bonded in a 7-coordinate geometry to one Ge(4), one Ge(5), one Ge(6), one Ge(7), one Ge(8), and two equivalent Ge(2) atoms. In the fourth Tb site, Tb(4) is bonded in a 7-coordinate geometry to one Ge(3), one Ge(5), one Ge(6), one Ge(7), one Ge(8), and two equivalent Ge(1) atoms. In the fifth Tb site, Tb(5) is bonded in a 6-coordinate geometry to one Ge(2), one Ge(5), one Ge(6), one Ge(8), and two equivalent Ge(4) atoms. In the sixth Tb site, Tb(6) is bonded in a 6-coordinate geometry to one Ge(2), one Ge(5), one Ge(7), one Ge(8), and two equivalent Ge(4) atoms. In the seventh Tb site, Tb(7) is bonded in a 6-coordinate geometry to one Ge(1), one Ge(6), one Ge(7), one Ge(8), and two equivalent Ge(3) atoms. There are eight inequivalent Ge sites. In the first Ge site, Ge(7) is bonded in a 9-coordinate geometry to one Mg(1), one Mg(3), one Tb(1), one Tb(2), one Tb(3), one Tb(4), one Tb(6), one Tb(7), and one Ge(5) atom. In the second Ge site, Ge(8) is bonded in a 9-coordinate geometry to one Mg(2), one Tb(1), one Tb(2), one Tb(3), one Tb(4), one Tb(5), one Tb(6), one Tb(7), and one Ge(6) atom. In the third Ge site, Ge(1) is bonded in a 9-coordinate geometry to one Mg(3), two equivalent Mg(1), one Tb(7), two equivalent Tb(1), two equivalent Tb(4), and one Ge(3) atom. In the fourth Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Mg(2), one Tb(5), one Tb(6), two equivalent Tb(2), two equivalent Tb(3), and one Ge(4) atom. In the fifth Ge site, Ge(3) is bonded in a 8-coordinate geometry to one Mg(1), two equivalent Mg(3), one Tb(1), one Tb(4), two equivalent Tb(7), and one Ge(1) atom. In the sixth Ge site, Ge(4) is bonded in a 8-coordinate geometry to one Mg(2), one Tb(2), one Tb(3), two equivalent Tb(5), two equivalent Tb(6), and one Ge(2) atom. In the seventh Ge site, Ge(5) is bonded in a 9-coordinate geometry to one Mg(2), one Mg(3), one Tb(1), one Tb(2), one Tb(3), one Tb(4), one Tb(5), one Tb(6), and one Ge(7) atom. In the eighth Ge site, Ge(6) is bonded in a 9-coordinate geometry to one Mg(1), one Mg(3), one Tb(1), one Tb(2), one Tb(3), one Tb(4), one Tb(5), one Tb(7), and one Ge(8) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Tb7Mg3Ge8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.180
_cell_length_b   7.845
_cell_length_c   14.499
_cell_angle_alpha   89.993
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   816.715
_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
  Tb  Tb0  1  0.490  0.934  0.653  1.0
  Tb  Tb1  1  0.990  0.066  0.347  1.0
  Tb  Tb2  1  0.513  0.566  0.156  1.0
  Tb  Tb3  1  0.013  0.434  0.844  1.0
  Tb  Tb4  1  0.511  0.566  0.844  1.0
  Tb  Tb5  1  0.011  0.434  0.156  1.0
  Tb  Tb6  1  0.488  0.935  0.347  1.0
  Tb  Tb7  1  0.988  0.065  0.653  1.0
  Tb  Tb8  1  0.671  0.072  0.125  1.0
  Tb  Tb9  1  0.171  0.928  0.875  1.0
  Tb  Tb10  1  0.670  0.074  0.876  1.0
  Tb  Tb11  1  0.170  0.926  0.124  1.0
  Tb  Tb12  1  0.330  0.431  0.380  1.0
  Tb  Tb13  1  0.830  0.569  0.620  1.0
  Mg  Mg14  1  0.158  0.767  0.499  1.0
  Mg  Mg15  1  0.658  0.233  0.501  1.0
  Mg  Mg16  1  0.840  0.730  1.000  1.0
  Mg  Mg17  1  0.340  0.270  0.000  1.0
  Mg  Mg18  1  0.327  0.428  0.626  1.0
  Mg  Mg19  1  0.827  0.572  0.374  1.0
  Ge  Ge20  1  0.285  0.112  0.500  1.0
  Ge  Ge21  1  0.785  0.888  0.500  1.0
  Ge  Ge22  1  0.713  0.387  1.000  1.0
  Ge  Ge23  1  0.213  0.613  0.000  1.0
  Ge  Ge24  1  0.527  0.658  0.499  1.0
  Ge  Ge25  1  0.027  0.342  0.501  1.0
  Ge  Ge26  1  0.478  0.837  0.999  1.0
  Ge  Ge27  1  0.978  0.163  0.001  1.0
  Ge  Ge28  1  0.332  0.219  0.785  1.0
  Ge  Ge29  1  0.832  0.781  0.215  1.0
  Ge  Ge30  1  0.671  0.286  0.289  1.0
  Ge  Ge31  1  0.171  0.714  0.711  1.0
  Ge  Ge32  1  0.665  0.285  0.712  1.0
  Ge  Ge33  1  0.165  0.715  0.288  1.0
  Ge  Ge34  1  0.331  0.217  0.215  1.0
  Ge  Ge35  1  0.831  0.783  0.785  1.0
[/CIF]
.