The compound described by Na3Eu2(GeSe3)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 Se(1) and four equivalent Se(2) atoms to form NaSe6 octahedra that share corners with four equivalent Eu(1)Se6 octahedra, edges with three equivalent Na(1)Se6 octahedra, edges with three equivalent Na(2)Se6 octahedra, and edges with four equivalent Eu(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 2°. In the second Na site, Na(2) is bonded to two equivalent Se(1) and four equivalent Se(2) atoms to form NaSe6 octahedra that share corners with four equivalent Eu(1)Se6 octahedra, edges with four equivalent Eu(1)Se6 octahedra, and edges with six equivalent Na(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 1°. Eu(1) is bonded to two equivalent Se(1) and four equivalent Se(2) atoms to form EuSe6 octahedra that share corners with two equivalent Na(2)Se6 octahedra, corners with four equivalent Na(1)Se6 octahedra, edges with two equivalent Na(2)Se6 octahedra, edges with three equivalent Eu(1)Se6 octahedra, and edges with four equivalent Na(1)Se6 octahedra. The corner-sharing octahedral tilt angles range from 1-2°. Ge(1) is bonded in a 3-coordinate geometry to one Se(1) and two equivalent Se(2) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to one Na(2), two equivalent Na(1), two equivalent Eu(1), and one Ge(1) atom to form a mixture of corner and edge-sharing SeNa3Eu2Ge octahedra. The corner-sharing octahedral tilt angles range from 0-87°. In the second Se site, Se(2) is bonded to one Na(2), two equivalent Na(1), two equivalent Eu(1), and one Ge(1) atom to form a mixture of corner and edge-sharing SeNa3Eu2Ge octahedra. The corner-sharing octahedral tilt angles range from 0-87°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na3Eu2(GeSe3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.387
_cell_length_b   7.387
_cell_length_c   8.037
_cell_angle_alpha   81.227
_cell_angle_beta   81.227
_cell_angle_gamma   120.011
_symmetry_Int_Tables_number   1
_cell_volume   361.698
_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  0.674  0.326  0.000  1.0
  Na  Na1  1  0.326  0.674  0.000  1.0
  Na  Na2  1  0.000  0.000  0.000  1.0
  Eu  Eu3  1  0.834  0.166  0.500  1.0
  Eu  Eu4  1  0.166  0.834  0.500  1.0
  Ge  Ge5  1  0.554  0.554  0.336  1.0
  Ge  Ge6  1  0.446  0.446  0.664  1.0
  Se  Se7  1  0.253  0.253  0.250  1.0
  Se  Se8  1  0.747  0.747  0.750  1.0
  Se  Se9  1  0.582  0.913  0.250  1.0
  Se  Se10  1  0.418  0.087  0.750  1.0
  Se  Se11  1  0.087  0.418  0.750  1.0
  Se  Se12  1  0.913  0.582  0.250  1.0
[/CIF]
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The compound described by Na3Eu2(GeSe3)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 Se(1) and four equivalent Se(2) atoms to form NaSe6 octahedra that share corners with four equivalent Eu(1)Se6 octahedra, edges with three equivalent Na(1)Se6 octahedra, edges with three equivalent Na(2)Se6 octahedra, and edges with four equivalent Eu(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 2°. In the second Na site, Na(2) is bonded to two equivalent Se(1) and four equivalent Se(2) atoms to form NaSe6 octahedra that share corners with four equivalent Eu(1)Se6 octahedra, edges with four equivalent Eu(1)Se6 octahedra, and edges with six equivalent Na(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 1°. Eu(1) is bonded to two equivalent Se(1) and four equivalent Se(2) atoms to form EuSe6 octahedra that share corners with two equivalent Na(2)Se6 octahedra, corners with four equivalent Na(1)Se6 octahedra, edges with two equivalent Na(2)Se6 octahedra, edges with three equivalent Eu(1)Se6 octahedra, and edges with four equivalent Na(1)Se6 octahedra. The corner-sharing octahedral tilt angles range from 1-2°. Ge(1) is bonded in a 3-coordinate geometry to one Se(1) and two equivalent Se(2) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to one Na(2), two equivalent Na(1), two equivalent Eu(1), and one Ge(1) atom to form a mixture of corner and edge-sharing SeNa3Eu2Ge octahedra. The corner-sharing octahedral tilt angles range from 0-87°. In the second Se site, Se(2) is bonded to one Na(2), two equivalent Na(1), two equivalent Eu(1), and one Ge(1) atom to form a mixture of corner and edge-sharing SeNa3Eu2Ge octahedra. The corner-sharing octahedral tilt angles range from 0-87°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na3Eu2(GeSe3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.387
_cell_length_b   7.387
_cell_length_c   8.037
_cell_angle_alpha   81.227
_cell_angle_beta   81.227
_cell_angle_gamma   120.011
_symmetry_Int_Tables_number   1
_cell_volume   361.698
_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  0.674  0.326  0.000  1.0
  Na  Na1  1  0.326  0.674  0.000  1.0
  Na  Na2  1  0.000  0.000  0.000  1.0
  Eu  Eu3  1  0.834  0.166  0.500  1.0
  Eu  Eu4  1  0.166  0.834  0.500  1.0
  Ge  Ge5  1  0.554  0.554  0.336  1.0
  Ge  Ge6  1  0.446  0.446  0.664  1.0
  Se  Se7  1  0.253  0.253  0.250  1.0
  Se  Se8  1  0.747  0.747  0.750  1.0
  Se  Se9  1  0.582  0.913  0.250  1.0
  Se  Se10  1  0.418  0.087  0.750  1.0
  Se  Se11  1  0.087  0.418  0.750  1.0
  Se  Se12  1  0.913  0.582  0.250  1.0
[/CIF]
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