data_Na2MgTc
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.76
_cell_length_b   5.76
_cell_length_c   5.29
_cell_angle_alpha   96.72
_cell_angle_beta   96.72
_cell_angle_gamma   27.39
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2MgTc
_chemical_formula_sum   'Na2 Mg1 Tc1'
_cell_volume   79.98
_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
  Na  Na1  1  0.27  0.0  0.4  1.0
  Na  Na2  1  0.28  0.0  0.85  1.0
  Mg  Mg0  1  0.0  0.0  0.0  1.0
  Tc  Tc3  1  0.27  0.0  0.62  1.0

data_Na2MgTc
_symmetry_space_group_name_H-M   P1
_cell_length_a   2.73
_cell_length_b   5.29
_cell_length_c   5.76
_cell_angle_alpha   96.72
_cell_angle_beta   103.69
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2MgTc
_chemical_formula_sum   'Na2 Mg1 Tc1'
_cell_volume   79.98
_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
  Na  Na0  1  0.0  0.4  0.27  1.0
  Na  Na1  1  0.0  0.85  0.28  1.0
  Mg  Mg2  1  0.0  0.0  0.0  1.0
  Tc  Tc3  1  0.0  0.62  0.27  1.0

Na Na Mg Tc
Na2MgTc crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one Na2MgTc cluster. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted single-bond geometry to one Tc(1) atom. The Na(1)-Tc(1) bond length is 1.20 Å. In the second Na site, Na(2) is bonded in a distorted bent 120 degrees geometry to one Mg(1) and one Tc(1) atom. The Na(2)-Mg(1) bond length is 1.86 Å. The Na(2)-Tc(1) bond length is 1.20 Å. Mg(1) is bonded in a distorted single-bond geometry to one Na(2) atom. Tc(1) is bonded in a linear geometry to one Na(1) and one Na(2) atom.