The material structure described by Na4Eu(SiTe3)2 crystallizes in the monoclinic C2 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent Te(1), two equivalent Te(2), and two equivalent Te(3) atoms to form NaTe6 octahedra that share corners with two equivalent Na(4)Te6 octahedra, corners with two equivalent Eu(1)Te6 octahedra, corners with two equivalent Si(1)SiTe3 tetrahedra, edges with two equivalent Na(4)Te6 octahedra, edges with two equivalent Eu(1)Te6 octahedra, edges with three equivalent Na(2)Te6 octahedra, edges with three equivalent Na(3)Te6 octahedra, and edges with two equivalent Si(1)SiTe3 tetrahedra. The corner-sharing octahedral tilt angles are 6°. In the second Na site, Na(2) is bonded to two equivalent Te(1), two equivalent Te(2), and two equivalent Te(3) atoms to form NaTe6 octahedra that share corners with two equivalent Na(4)Te6 octahedra, corners with two equivalent Eu(1)Te6 octahedra, corners with two equivalent Si(1)SiTe3 tetrahedra, edges with two equivalent Na(4)Te6 octahedra, edges with two equivalent Eu(1)Te6 octahedra, edges with three equivalent Na(1)Te6 octahedra, edges with three equivalent Na(3)Te6 octahedra, and edges with two equivalent Si(1)SiTe3 tetrahedra. The corner-sharing octahedral tilt angles are 6°. In the third Na site, Na(3) is bonded to two equivalent Te(1), two equivalent Te(2), and two equivalent Te(3) atoms to form NaTe6 octahedra that share corners with two equivalent Na(4)Te6 octahedra, corners with two equivalent Eu(1)Te6 octahedra, corners with two equivalent Si(1)SiTe3 tetrahedra, edges with two equivalent Na(4)Te6 octahedra, edges with two equivalent Eu(1)Te6 octahedra, edges with three equivalent Na(1)Te6 octahedra, edges with three equivalent Na(2)Te6 octahedra, and edges with two equivalent Si(1)SiTe3 tetrahedra. The corner-sharing octahedral tilt angles are 6°. In the fourth Na site, Na(4) is bonded to two equivalent Te(1), two equivalent Te(2), and two equivalent Te(3) atoms to form NaTe6 octahedra that share corners with two equivalent Na(1)Te6 octahedra, corners with two equivalent Na(2)Te6 octahedra, corners with two equivalent Na(3)Te6 octahedra, corners with six equivalent Si(1)SiTe3 tetrahedra, edges with two equivalent Na(1)Te6 octahedra, edges with two equivalent Na(2)Te6 octahedra, edges with two equivalent Na(3)Te6 octahedra, and edges with three equivalent Eu(1)Te6 octahedra. The corner-sharing octahedral tilt angles are 6°. Eu(1) is bonded to two equivalent Te(1), two equivalent Te(2), and two equivalent Te(3) atoms to form EuTe6 octahedra that share corners with two equivalent Na(1)Te6 octahedra, corners with two equivalent Na(2)Te6 octahedra, corners with two equivalent Na(3)Te6 octahedra, corners with six equivalent Si(1)SiTe3 tetrahedra, edges with two equivalent Na(1)Te6 octahedra, edges with two equivalent Na(2)Te6 octahedra, edges with two equivalent Na(3)Te6 octahedra, and edges with three equivalent Na(4)Te6 octahedra. The corner-sharing octahedral tilt angles are 6°. Si(1) is bonded to one Si(1), one Te(1), one Te(2), and one Te(3) atom to form SiSiTe3 tetrahedra that share  a cornercorner with one Na(1)Te6 octahedra,  a cornercorner with one Na(2)Te6 octahedra,  a cornercorner with one Na(3)Te6 octahedra,  a cornercorner with one Te(1)Na4EuSi octahedra,  a cornercorner with one Te(2)Na4EuSi octahedra,  a cornercorner with one Te(3)Na4EuSi octahedra, corners with three equivalent Na(4)Te6 octahedra, corners with three equivalent Eu(1)Te6 octahedra,  an edgeedge with one Na(1)Te6 octahedra,  an edgeedge with one Na(2)Te6 octahedra, and  an edgeedge with one Na(3)Te6 octahedra. The corner-sharing octahedral tilt angles range from 19-77°. There are three inequivalent Te sites. In the first Te site, Te(1) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), one Eu(1), and one Si(1) atom to form TeNa4EuSi octahedra that share  a cornercorner with one Te(1)Na4EuSi octahedra, corners with three equivalent Te(2)Na4EuSi octahedra, corners with three equivalent Te(3)Na4EuSi octahedra,  a cornercorner with one Si(1)SiTe3 tetrahedra, edges with two equivalent Te(1)Na4EuSi octahedra, edges with four equivalent Te(2)Na4EuSi octahedra, and edges with four equivalent Te(3)Na4EuSi octahedra. The corner-sharing octahedral tilt angles range from 0-91°. In the second Te site, Te(2) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), one Eu(1), and one Si(1) atom to form TeNa4EuSi octahedra that share  a cornercorner with one Te(3)Na4EuSi octahedra, corners with three equivalent Te(1)Na4EuSi octahedra, corners with three equivalent Te(2)Na4EuSi octahedra,  a cornercorner with one Si(1)SiTe3 tetrahedra,  an edgeedge with one Te(2)Na4EuSi octahedra, edges with four equivalent Te(1)Na4EuSi octahedra, and edges with five equivalent Te(3)Na4EuSi octahedra. The corner-sharing octahedral tilt angles range from 0-91°. In the third Te site, Te(3) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), one Eu(1), and one Si(1) atom to form TeNa4EuSi octahedra that share  a cornercorner with one Te(2)Na4EuSi octahedra, corners with three equivalent Te(1)Na4EuSi octahedra, corners with three equivalent Te(3)Na4EuSi octahedra,  a cornercorner with one Si(1)SiTe3 tetrahedra,  an edgeedge with one Te(3)Na4EuSi octahedra, edges with four equivalent Te(1)Na4EuSi octahedra, and edges with five equivalent Te(2)Na4EuSi octahedra. The corner-sharing octahedral tilt angles range from 0-91°. is represented by the CIF card [CIF]
data_Na4Eu(SiTe3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.721
_cell_length_b   7.721
_cell_length_c   8.517
_cell_angle_alpha   81.266
_cell_angle_beta   81.266
_cell_angle_gamma   119.898
_symmetry_Int_Tables_number   1
_cell_volume   419.377
_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  0.668  0.332  0.000  1.0
  Na  Na1  1  0.332  0.668  0.000  1.0
  Na  Na2  1  0.000  1.000  0.000  1.0
  Na  Na3  1  0.833  0.167  0.500  1.0
  Eu  Eu4  1  0.167  0.834  0.500  1.0
  Si  Si5  1  0.548  0.547  0.354  1.0
  Si  Si6  1  0.453  0.452  0.646  1.0
  Te  Te7  1  0.268  0.267  0.258  1.0
  Te  Te8  1  0.733  0.732  0.742  1.0
  Te  Te9  1  0.894  0.581  0.256  1.0
  Te  Te10  1  0.580  0.893  0.256  1.0
  Te  Te11  1  0.107  0.420  0.744  1.0
  Te  Te12  1  0.419  0.106  0.744  1.0
[/CIF]
.
The material structure described by Na4Eu(SiTe3)2 crystallizes in the monoclinic C2 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent Te(1), two equivalent Te(2), and two equivalent Te(3) atoms to form NaTe6 octahedra that share corners with two equivalent Na(4)Te6 octahedra, corners with two equivalent Eu(1)Te6 octahedra, corners with two equivalent Si(1)SiTe3 tetrahedra, edges with two equivalent Na(4)Te6 octahedra, edges with two equivalent Eu(1)Te6 octahedra, edges with three equivalent Na(2)Te6 octahedra, edges with three equivalent Na(3)Te6 octahedra, and edges with two equivalent Si(1)SiTe3 tetrahedra. The corner-sharing octahedral tilt angles are 6°. In the second Na site, Na(2) is bonded to two equivalent Te(1), two equivalent Te(2), and two equivalent Te(3) atoms to form NaTe6 octahedra that share corners with two equivalent Na(4)Te6 octahedra, corners with two equivalent Eu(1)Te6 octahedra, corners with two equivalent Si(1)SiTe3 tetrahedra, edges with two equivalent Na(4)Te6 octahedra, edges with two equivalent Eu(1)Te6 octahedra, edges with three equivalent Na(1)Te6 octahedra, edges with three equivalent Na(3)Te6 octahedra, and edges with two equivalent Si(1)SiTe3 tetrahedra. The corner-sharing octahedral tilt angles are 6°. In the third Na site, Na(3) is bonded to two equivalent Te(1), two equivalent Te(2), and two equivalent Te(3) atoms to form NaTe6 octahedra that share corners with two equivalent Na(4)Te6 octahedra, corners with two equivalent Eu(1)Te6 octahedra, corners with two equivalent Si(1)SiTe3 tetrahedra, edges with two equivalent Na(4)Te6 octahedra, edges with two equivalent Eu(1)Te6 octahedra, edges with three equivalent Na(1)Te6 octahedra, edges with three equivalent Na(2)Te6 octahedra, and edges with two equivalent Si(1)SiTe3 tetrahedra. The corner-sharing octahedral tilt angles are 6°. In the fourth Na site, Na(4) is bonded to two equivalent Te(1), two equivalent Te(2), and two equivalent Te(3) atoms to form NaTe6 octahedra that share corners with two equivalent Na(1)Te6 octahedra, corners with two equivalent Na(2)Te6 octahedra, corners with two equivalent Na(3)Te6 octahedra, corners with six equivalent Si(1)SiTe3 tetrahedra, edges with two equivalent Na(1)Te6 octahedra, edges with two equivalent Na(2)Te6 octahedra, edges with two equivalent Na(3)Te6 octahedra, and edges with three equivalent Eu(1)Te6 octahedra. The corner-sharing octahedral tilt angles are 6°. Eu(1) is bonded to two equivalent Te(1), two equivalent Te(2), and two equivalent Te(3) atoms to form EuTe6 octahedra that share corners with two equivalent Na(1)Te6 octahedra, corners with two equivalent Na(2)Te6 octahedra, corners with two equivalent Na(3)Te6 octahedra, corners with six equivalent Si(1)SiTe3 tetrahedra, edges with two equivalent Na(1)Te6 octahedra, edges with two equivalent Na(2)Te6 octahedra, edges with two equivalent Na(3)Te6 octahedra, and edges with three equivalent Na(4)Te6 octahedra. The corner-sharing octahedral tilt angles are 6°. Si(1) is bonded to one Si(1), one Te(1), one Te(2), and one Te(3) atom to form SiSiTe3 tetrahedra that share  a cornercorner with one Na(1)Te6 octahedra,  a cornercorner with one Na(2)Te6 octahedra,  a cornercorner with one Na(3)Te6 octahedra,  a cornercorner with one Te(1)Na4EuSi octahedra,  a cornercorner with one Te(2)Na4EuSi octahedra,  a cornercorner with one Te(3)Na4EuSi octahedra, corners with three equivalent Na(4)Te6 octahedra, corners with three equivalent Eu(1)Te6 octahedra,  an edgeedge with one Na(1)Te6 octahedra,  an edgeedge with one Na(2)Te6 octahedra, and  an edgeedge with one Na(3)Te6 octahedra. The corner-sharing octahedral tilt angles range from 19-77°. There are three inequivalent Te sites. In the first Te site, Te(1) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), one Eu(1), and one Si(1) atom to form TeNa4EuSi octahedra that share  a cornercorner with one Te(1)Na4EuSi octahedra, corners with three equivalent Te(2)Na4EuSi octahedra, corners with three equivalent Te(3)Na4EuSi octahedra,  a cornercorner with one Si(1)SiTe3 tetrahedra, edges with two equivalent Te(1)Na4EuSi octahedra, edges with four equivalent Te(2)Na4EuSi octahedra, and edges with four equivalent Te(3)Na4EuSi octahedra. The corner-sharing octahedral tilt angles range from 0-91°. In the second Te site, Te(2) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), one Eu(1), and one Si(1) atom to form TeNa4EuSi octahedra that share  a cornercorner with one Te(3)Na4EuSi octahedra, corners with three equivalent Te(1)Na4EuSi octahedra, corners with three equivalent Te(2)Na4EuSi octahedra,  a cornercorner with one Si(1)SiTe3 tetrahedra,  an edgeedge with one Te(2)Na4EuSi octahedra, edges with four equivalent Te(1)Na4EuSi octahedra, and edges with five equivalent Te(3)Na4EuSi octahedra. The corner-sharing octahedral tilt angles range from 0-91°. In the third Te site, Te(3) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), one Eu(1), and one Si(1) atom to form TeNa4EuSi octahedra that share  a cornercorner with one Te(2)Na4EuSi octahedra, corners with three equivalent Te(1)Na4EuSi octahedra, corners with three equivalent Te(3)Na4EuSi octahedra,  a cornercorner with one Si(1)SiTe3 tetrahedra,  an edgeedge with one Te(3)Na4EuSi octahedra, edges with four equivalent Te(1)Na4EuSi octahedra, and edges with five equivalent Te(2)Na4EuSi octahedra. The corner-sharing octahedral tilt angles range from 0-91°. is represented by the CIF card [CIF]
data_Na4Eu(SiTe3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.721
_cell_length_b   7.721
_cell_length_c   8.517
_cell_angle_alpha   81.266
_cell_angle_beta   81.266
_cell_angle_gamma   119.898
_symmetry_Int_Tables_number   1
_cell_volume   419.377
_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  0.668  0.332  0.000  1.0
  Na  Na1  1  0.332  0.668  0.000  1.0
  Na  Na2  1  0.000  1.000  0.000  1.0
  Na  Na3  1  0.833  0.167  0.500  1.0
  Eu  Eu4  1  0.167  0.834  0.500  1.0
  Si  Si5  1  0.548  0.547  0.354  1.0
  Si  Si6  1  0.453  0.452  0.646  1.0
  Te  Te7  1  0.268  0.267  0.258  1.0
  Te  Te8  1  0.733  0.732  0.742  1.0
  Te  Te9  1  0.894  0.581  0.256  1.0
  Te  Te10  1  0.580  0.893  0.256  1.0
  Te  Te11  1  0.107  0.420  0.744  1.0
  Te  Te12  1  0.419  0.106  0.744  1.0
[/CIF]
.