The crystal structure described by Na2Eu2Ti3O10 crystallizes in the tetragonal I4/mmm space group. Na(1) is bonded in a 5-coordinate geometry to five equivalent O(2) atoms. Eu(1) is bonded to four equivalent O(1), four equivalent O(3), and four equivalent O(4) atoms to form distorted EuO12 cuboctahedra that share corners with eight equivalent Eu(1)O12 cuboctahedra, faces with five equivalent Eu(1)O12 cuboctahedra, and faces with four equivalent Ti(2)O6 octahedra. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded in a 6-coordinate geometry to one O(2), one O(3), and four equivalent O(1) atoms. In the second Ti site, Ti(2) is bonded to two equivalent O(3) and four equivalent O(4) atoms to form TiO6 octahedra that share corners with four equivalent Ti(2)O6 octahedra and faces with eight equivalent Eu(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Eu(1) and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded to five equivalent Na(1) and one Ti(1) atom to form distorted ONa5Ti octahedra that share  a cornercorner with one O(3)Eu4Ti2 octahedra, corners with four equivalent O(2)Na5Ti octahedra, and edges with eight equivalent O(2)Na5Ti octahedra. The corner-sharing octahedral tilt angles range from 0-4°. In the third O site, O(3) is bonded to four equivalent Eu(1), one Ti(1), and one Ti(2) atom to form distorted OEu4Ti2 octahedra that share  a cornercorner with one O(2)Na5Ti octahedra, corners with five equivalent O(3)Eu4Ti2 octahedra, and edges with four equivalent O(3)Eu4Ti2 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the fourth O site, O(4) is bonded in a linear geometry to four equivalent Eu(1) and two equivalent Ti(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2Eu2Ti3O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.563
_cell_length_b   14.563
_cell_length_c   14.563
_cell_angle_alpha   164.761
_cell_angle_beta   164.761
_cell_angle_gamma   21.615
_symmetry_Int_Tables_number   1
_cell_volume   213.342
_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  0.289  0.289  0.000  1.0
  Na  Na1  1  0.711  0.711  0.000  1.0
  Eu  Eu2  1  0.424  0.424  0.000  1.0
  Eu  Eu3  1  0.576  0.576  0.000  1.0
  Ti  Ti4  1  0.147  0.147  0.000  1.0
  Ti  Ti5  1  0.853  0.853  0.000  1.0
  Ti  Ti6  1  0.000  0.000  0.000  1.0
  O  O7  1  0.367  0.867  0.500  1.0
  O  O8  1  0.867  0.367  0.500  1.0
  O  O9  1  0.633  0.133  0.500  1.0
  O  O10  1  0.133  0.633  0.500  1.0
  O  O11  1  0.792  0.792  0.000  1.0
  O  O12  1  0.208  0.208  0.000  1.0
  O  O13  1  0.932  0.932  0.000  1.0
  O  O14  1  0.000  0.500  0.500  1.0
  O  O15  1  0.500  0.000  0.500  1.0
  O  O16  1  0.068  0.068  0.000  1.0
[/CIF]
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The crystal structure described by Na2Eu2Ti3O10 crystallizes in the tetragonal I4/mmm space group. Na(1) is bonded in a 5-coordinate geometry to five equivalent O(2) atoms. Eu(1) is bonded to four equivalent O(1), four equivalent O(3), and four equivalent O(4) atoms to form distorted EuO12 cuboctahedra that share corners with eight equivalent Eu(1)O12 cuboctahedra, faces with five equivalent Eu(1)O12 cuboctahedra, and faces with four equivalent Ti(2)O6 octahedra. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded in a 6-coordinate geometry to one O(2), one O(3), and four equivalent O(1) atoms. In the second Ti site, Ti(2) is bonded to two equivalent O(3) and four equivalent O(4) atoms to form TiO6 octahedra that share corners with four equivalent Ti(2)O6 octahedra and faces with eight equivalent Eu(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Eu(1) and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded to five equivalent Na(1) and one Ti(1) atom to form distorted ONa5Ti octahedra that share  a cornercorner with one O(3)Eu4Ti2 octahedra, corners with four equivalent O(2)Na5Ti octahedra, and edges with eight equivalent O(2)Na5Ti octahedra. The corner-sharing octahedral tilt angles range from 0-4°. In the third O site, O(3) is bonded to four equivalent Eu(1), one Ti(1), and one Ti(2) atom to form distorted OEu4Ti2 octahedra that share  a cornercorner with one O(2)Na5Ti octahedra, corners with five equivalent O(3)Eu4Ti2 octahedra, and edges with four equivalent O(3)Eu4Ti2 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the fourth O site, O(4) is bonded in a linear geometry to four equivalent Eu(1) and two equivalent Ti(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2Eu2Ti3O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.563
_cell_length_b   14.563
_cell_length_c   14.563
_cell_angle_alpha   164.761
_cell_angle_beta   164.761
_cell_angle_gamma   21.615
_symmetry_Int_Tables_number   1
_cell_volume   213.342
_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  0.289  0.289  0.000  1.0
  Na  Na1  1  0.711  0.711  0.000  1.0
  Eu  Eu2  1  0.424  0.424  0.000  1.0
  Eu  Eu3  1  0.576  0.576  0.000  1.0
  Ti  Ti4  1  0.147  0.147  0.000  1.0
  Ti  Ti5  1  0.853  0.853  0.000  1.0
  Ti  Ti6  1  0.000  0.000  0.000  1.0
  O  O7  1  0.367  0.867  0.500  1.0
  O  O8  1  0.867  0.367  0.500  1.0
  O  O9  1  0.633  0.133  0.500  1.0
  O  O10  1  0.133  0.633  0.500  1.0
  O  O11  1  0.792  0.792  0.000  1.0
  O  O12  1  0.208  0.208  0.000  1.0
  O  O13  1  0.932  0.932  0.000  1.0
  O  O14  1  0.000  0.500  0.500  1.0
  O  O15  1  0.500  0.000  0.500  1.0
  O  O16  1  0.068  0.068  0.000  1.0
[/CIF]
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