The crystal structure described by EuTa2O6 crystallizes in the tetragonal P4/mmm space group. Eu(1) is bonded to four equivalent O(2) and eight equivalent O(3) atoms to form EuO12 cuboctahedra that share corners with four equivalent Eu(1)O12 cuboctahedra, faces with four equivalent Eu(1)O12 cuboctahedra, and faces with eight equivalent Ta(1)O6 octahedra. Ta(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form TaO6 octahedra that share corners with six equivalent Ta(1)O6 octahedra and faces with four equivalent Eu(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-14°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Ta(1) atoms. In the second O site, O(2) is bonded in a distorted linear geometry to four equivalent Eu(1) and two equivalent Ta(1) atoms. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Eu(1) and two equivalent Ta(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_EuTa2O6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.937
_cell_length_b   3.936
_cell_length_c   7.966
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.014
_symmetry_Int_Tables_number   1
_cell_volume   123.453
_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
  Eu  Eu0  1  0.000  1.000  0.000  1.0
  Ta  Ta1  1  0.500  0.500  0.260  1.0
  Ta  Ta2  1  0.500  0.500  0.740  1.0
  O  O3  1  0.500  0.500  0.500  1.0
  O  O4  1  0.500  0.500  1.000  1.0
  O  O5  1  1.000  0.500  0.770  1.0
  O  O6  1  0.500  0.000  0.230  1.0
  O  O7  1  0.500  0.000  0.770  1.0
  O  O8  1  1.000  0.500  0.230  1.0
[/CIF]
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The crystal structure described by EuTa2O6 crystallizes in the tetragonal P4/mmm space group. Eu(1) is bonded to four equivalent O(2) and eight equivalent O(3) atoms to form EuO12 cuboctahedra that share corners with four equivalent Eu(1)O12 cuboctahedra, faces with four equivalent Eu(1)O12 cuboctahedra, and faces with eight equivalent Ta(1)O6 octahedra. Ta(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form TaO6 octahedra that share corners with six equivalent Ta(1)O6 octahedra and faces with four equivalent Eu(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-14°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Ta(1) atoms. In the second O site, O(2) is bonded in a distorted linear geometry to four equivalent Eu(1) and two equivalent Ta(1) atoms. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Eu(1) and two equivalent Ta(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_EuTa2O6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.937
_cell_length_b   3.936
_cell_length_c   7.966
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.014
_symmetry_Int_Tables_number   1
_cell_volume   123.453
_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
  Eu  Eu0  1  0.000  1.000  0.000  1.0
  Ta  Ta1  1  0.500  0.500  0.260  1.0
  Ta  Ta2  1  0.500  0.500  0.740  1.0
  O  O3  1  0.500  0.500  0.500  1.0
  O  O4  1  0.500  0.500  1.000  1.0
  O  O5  1  1.000  0.500  0.770  1.0
  O  O6  1  0.500  0.000  0.230  1.0
  O  O7  1  0.500  0.000  0.770  1.0
  O  O8  1  1.000  0.500  0.230  1.0
[/CIF]
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