The compound described by Na3Eu2(SiTe3)2 crystallizes in the monoclinic C2/m space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent Te(2) and four equivalent Te(1) atoms to form NaTe6 octahedra that share corners with four equivalent Eu(1)Te6 octahedra, corners with two equivalent Si(1)SiTe3 tetrahedra, edges with three equivalent Na(1)Te6 octahedra, edges with three equivalent Na(2)Te6 octahedra, edges with four equivalent Eu(1)Te6 octahedra, and edges with two equivalent Si(1)SiTe3 tetrahedra. The corner-sharing octahedral tilt angles are 5°. In the second Na site, Na(2) is bonded to two equivalent Te(2) and four equivalent Te(1) atoms to form NaTe6 octahedra that share corners with four equivalent Eu(1)Te6 octahedra, corners with two equivalent Si(1)SiTe3 tetrahedra, edges with four equivalent Eu(1)Te6 octahedra, edges with six equivalent Na(1)Te6 octahedra, and edges with two equivalent Si(1)SiTe3 tetrahedra. The corner-sharing octahedral tilt angles are 5°. Eu(1) is bonded to two equivalent Te(2) and four equivalent Te(1) atoms to form EuTe6 octahedra that share corners with two equivalent Na(2)Te6 octahedra, corners with four equivalent Na(1)Te6 octahedra, corners with six equivalent Si(1)SiTe3 tetrahedra, edges with two equivalent Na(2)Te6 octahedra, edges with three equivalent Eu(1)Te6 octahedra, and edges with four equivalent Na(1)Te6 octahedra. The corner-sharing octahedral tilt angles are 5°. Si(1) is bonded to one Si(1), one Te(2), and two equivalent Te(1) atoms to form SiSiTe3 tetrahedra that share  a cornercorner with one Na(2)Te6 octahedra,  a cornercorner with one Te(2)Na3Eu2Si octahedra, corners with two equivalent Na(1)Te6 octahedra, corners with two equivalent Te(1)Na3Eu2Si octahedra, corners with six equivalent Eu(1)Te6 octahedra,  an edgeedge with one Na(2)Te6 octahedra, and edges with two equivalent Na(1)Te6 octahedra. The corner-sharing octahedral tilt angles range from 20-77°. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded to one Na(2), two equivalent Na(1), two equivalent Eu(1), and one Si(1) atom to form TeNa3Eu2Si octahedra that share corners with three equivalent Te(2)Na3Eu2Si octahedra, corners with four equivalent Te(1)Na3Eu2Si octahedra,  a cornercorner with one Si(1)SiTe3 tetrahedra, edges with four equivalent Te(2)Na3Eu2Si octahedra, and edges with six equivalent Te(1)Na3Eu2Si octahedra. The corner-sharing octahedral tilt angles range from 0-91°. In the second Te site, Te(2) is bonded to one Na(2), two equivalent Na(1), two equivalent Eu(1), and one Si(1) atom to form TeNa3Eu2Si octahedra that share  a cornercorner with one Te(2)Na3Eu2Si octahedra, corners with six equivalent Te(1)Na3Eu2Si octahedra,  a cornercorner with one Si(1)SiTe3 tetrahedra, edges with two equivalent Te(2)Na3Eu2Si octahedra, and edges with eight equivalent Te(1)Na3Eu2Si octahedra. The corner-sharing octahedral tilt angles range from 0-91°. is represented by the CIF card [CIF]
data_Na3Eu2(SiTe3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.797
_cell_length_b   7.797
_cell_length_c   8.479
_cell_angle_alpha   81.214
_cell_angle_beta   81.214
_cell_angle_gamma   119.995
_symmetry_Int_Tables_number   1
_cell_volume   425.020
_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  0.000  0.000  1.0
  Eu  Eu3  1  0.833  0.167  0.500  1.0
  Eu  Eu4  1  0.167  0.833  0.500  1.0
  Si  Si5  1  0.548  0.548  0.353  1.0
  Si  Si6  1  0.452  0.452  0.647  1.0
  Te  Te7  1  0.581  0.899  0.256  1.0
  Te  Te8  1  0.419  0.101  0.744  1.0
  Te  Te9  1  0.101  0.419  0.744  1.0
  Te  Te10  1  0.899  0.581  0.256  1.0
  Te  Te11  1  0.262  0.262  0.258  1.0
  Te  Te12  1  0.738  0.738  0.742  1.0
[/CIF]
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The compound described by Na3Eu2(SiTe3)2 crystallizes in the monoclinic C2/m space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to two equivalent Te(2) and four equivalent Te(1) atoms to form NaTe6 octahedra that share corners with four equivalent Eu(1)Te6 octahedra, corners with two equivalent Si(1)SiTe3 tetrahedra, edges with three equivalent Na(1)Te6 octahedra, edges with three equivalent Na(2)Te6 octahedra, edges with four equivalent Eu(1)Te6 octahedra, and edges with two equivalent Si(1)SiTe3 tetrahedra. The corner-sharing octahedral tilt angles are 5°. In the second Na site, Na(2) is bonded to two equivalent Te(2) and four equivalent Te(1) atoms to form NaTe6 octahedra that share corners with four equivalent Eu(1)Te6 octahedra, corners with two equivalent Si(1)SiTe3 tetrahedra, edges with four equivalent Eu(1)Te6 octahedra, edges with six equivalent Na(1)Te6 octahedra, and edges with two equivalent Si(1)SiTe3 tetrahedra. The corner-sharing octahedral tilt angles are 5°. Eu(1) is bonded to two equivalent Te(2) and four equivalent Te(1) atoms to form EuTe6 octahedra that share corners with two equivalent Na(2)Te6 octahedra, corners with four equivalent Na(1)Te6 octahedra, corners with six equivalent Si(1)SiTe3 tetrahedra, edges with two equivalent Na(2)Te6 octahedra, edges with three equivalent Eu(1)Te6 octahedra, and edges with four equivalent Na(1)Te6 octahedra. The corner-sharing octahedral tilt angles are 5°. Si(1) is bonded to one Si(1), one Te(2), and two equivalent Te(1) atoms to form SiSiTe3 tetrahedra that share  a cornercorner with one Na(2)Te6 octahedra,  a cornercorner with one Te(2)Na3Eu2Si octahedra, corners with two equivalent Na(1)Te6 octahedra, corners with two equivalent Te(1)Na3Eu2Si octahedra, corners with six equivalent Eu(1)Te6 octahedra,  an edgeedge with one Na(2)Te6 octahedra, and edges with two equivalent Na(1)Te6 octahedra. The corner-sharing octahedral tilt angles range from 20-77°. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded to one Na(2), two equivalent Na(1), two equivalent Eu(1), and one Si(1) atom to form TeNa3Eu2Si octahedra that share corners with three equivalent Te(2)Na3Eu2Si octahedra, corners with four equivalent Te(1)Na3Eu2Si octahedra,  a cornercorner with one Si(1)SiTe3 tetrahedra, edges with four equivalent Te(2)Na3Eu2Si octahedra, and edges with six equivalent Te(1)Na3Eu2Si octahedra. The corner-sharing octahedral tilt angles range from 0-91°. In the second Te site, Te(2) is bonded to one Na(2), two equivalent Na(1), two equivalent Eu(1), and one Si(1) atom to form TeNa3Eu2Si octahedra that share  a cornercorner with one Te(2)Na3Eu2Si octahedra, corners with six equivalent Te(1)Na3Eu2Si octahedra,  a cornercorner with one Si(1)SiTe3 tetrahedra, edges with two equivalent Te(2)Na3Eu2Si octahedra, and edges with eight equivalent Te(1)Na3Eu2Si octahedra. The corner-sharing octahedral tilt angles range from 0-91°. is represented by the CIF card [CIF]
data_Na3Eu2(SiTe3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.797
_cell_length_b   7.797
_cell_length_c   8.479
_cell_angle_alpha   81.214
_cell_angle_beta   81.214
_cell_angle_gamma   119.995
_symmetry_Int_Tables_number   1
_cell_volume   425.020
_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  0.000  0.000  1.0
  Eu  Eu3  1  0.833  0.167  0.500  1.0
  Eu  Eu4  1  0.167  0.833  0.500  1.0
  Si  Si5  1  0.548  0.548  0.353  1.0
  Si  Si6  1  0.452  0.452  0.647  1.0
  Te  Te7  1  0.581  0.899  0.256  1.0
  Te  Te8  1  0.419  0.101  0.744  1.0
  Te  Te9  1  0.101  0.419  0.744  1.0
  Te  Te10  1  0.899  0.581  0.256  1.0
  Te  Te11  1  0.262  0.262  0.258  1.0
  Te  Te12  1  0.738  0.738  0.742  1.0
[/CIF]
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