The structure described by Na3EuTi2Nb2O12 is Orthorhombic Perovskite-derived structured and crystallizes in the monoclinic Pm space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 9-coordinate geometry to one O(12), one O(13), one O(3), one O(4), one O(5), one O(6), one O(9), and two equivalent O(14) atoms. In the second Na site, Na(2) is bonded in a 9-coordinate geometry to one O(10), one O(11), one O(14), one O(3), one O(4), one O(5), one O(6), and two equivalent O(9) atoms. In the third Na site, Na(3) is bonded in a 8-coordinate geometry to one O(2), one O(8), two equivalent O(11), two equivalent O(13), and two equivalent O(6) atoms. In the fourth Na site, Na(4) is bonded in a 8-coordinate geometry to one O(2), one O(8), two equivalent O(11), two equivalent O(13), and two equivalent O(3) atoms. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to one O(1), one O(7), two equivalent O(10), two equivalent O(12), and two equivalent O(5) atoms. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to one O(1), one O(7), two equivalent O(10), two equivalent O(12), and two equivalent O(4) atoms. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(10), one O(12), one O(14), one O(4), and one O(5) atom to form TiO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Nb(2)O6 octahedra, and corners with four equivalent Ti(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-26°. In the second Ti site, Ti(2) is bonded to one O(10), one O(12), one O(4), one O(5), one O(7), and one O(9) atom to form TiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Nb(1)O6 octahedra, and corners with four equivalent Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-26°. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(11), one O(13), one O(3), one O(6), one O(8), and one O(9) atom to form NbO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Nb(1)O6 octahedra, and corners with four equivalent Nb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 20-30°. In the second Nb site, Nb(2) is bonded to one O(11), one O(13), one O(14), one O(2), one O(3), and one O(6) atom to form NbO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Nb(2)O6 octahedra, and corners with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 20-30°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Eu(1), one Eu(2), and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(3), one Na(4), and two equivalent Nb(2) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(4), one Nb(1), and one Nb(2) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Eu(2), one Ti(1), and one Ti(2) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Eu(1), one Ti(1), and one Ti(2) atom. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one Nb(1), and one Nb(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Eu(1), one Eu(2), and two equivalent Ti(2) atoms. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Na(3), one Na(4), and two equivalent Nb(1) atoms. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Na(1), two equivalent Na(2), one Ti(2), and one Nb(1) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Na(2), one Eu(1), one Eu(2), one Ti(1), and one Ti(2) atom. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one Na(2), one Na(3), one Na(4), one Nb(1), and one Nb(2) atom. In the twelfth O site, O(12) is bonded in a 5-coordinate geometry to one Na(1), one Eu(1), one Eu(2), one Ti(1), and one Ti(2) atom. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one Na(1), one Na(3), one Na(4), one Nb(1), and one Nb(2) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Na(2), two equivalent Na(1), one Ti(1), and one Nb(2) atom. is represented by the CIF card [CIF]
data_Na3EuTi2Nb2O12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.533
_cell_length_b   5.615
_cell_length_c   15.626
_cell_angle_alpha   89.995
_cell_angle_beta   89.999
_cell_angle_gamma   89.878
_symmetry_Int_Tables_number   1
_cell_volume   485.459
_cell_formula_units_Z   2
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  0.001  0.988  0.371  1.0
  Na  Na1  1  0.001  0.988  0.880  1.0
  Na  Na2  1  0.500  0.488  0.880  1.0
  Na  Na3  1  0.500  0.488  0.371  1.0
  Na  Na4  1  0.508  0.532  0.625  1.0
  Na  Na5  1  0.994  0.031  0.625  1.0
  Eu  Eu6  1  0.502  0.540  0.125  1.0
  Eu  Eu7  1  0.998  0.039  0.125  1.0
  Ti  Ti8  1  0.005  0.519  0.252  1.0
  Ti  Ti9  1  0.496  0.019  0.252  1.0
  Ti  Ti10  1  0.496  0.019  0.998  1.0
  Ti  Ti11  1  0.005  0.519  0.998  1.0
  Nb  Nb12  1  0.496  0.019  0.752  1.0
  Nb  Nb13  1  0.496  0.019  0.499  1.0
  Nb  Nb14  1  0.007  0.518  0.498  1.0
  Nb  Nb15  1  0.007  0.518  0.752  1.0
  O  O16  1  0.068  0.473  0.125  1.0
  O  O17  1  0.069  0.476  0.625  1.0
  O  O18  1  0.206  0.203  0.481  1.0
  O  O19  1  0.215  0.205  0.992  1.0
  O  O20  1  0.215  0.205  0.258  1.0
  O  O21  1  0.206  0.203  0.769  1.0
  O  O22  1  0.284  0.704  0.258  1.0
  O  O23  1  0.293  0.703  0.481  1.0
  O  O24  1  0.293  0.703  0.769  1.0
  O  O25  1  0.284  0.704  0.992  1.0
  O  O26  1  0.431  0.973  0.125  1.0
  O  O27  1  0.430  0.976  0.625  1.0
  O  O28  1  0.565  0.005  0.878  1.0
  O  O29  1  0.565  0.005  0.372  1.0
  O  O30  1  0.716  0.270  0.025  1.0
  O  O31  1  0.716  0.270  0.225  1.0
  O  O32  1  0.710  0.282  0.517  1.0
  O  O33  1  0.710  0.282  0.733  1.0
  O  O34  1  0.783  0.770  0.225  1.0
  O  O35  1  0.788  0.781  0.733  1.0
  O  O36  1  0.783  0.771  0.025  1.0
  O  O37  1  0.788  0.781  0.517  1.0
  O  O38  1  0.934  0.505  0.372  1.0
  O  O39  1  0.934  0.505  0.878  1.0
[/CIF]
.
The structure described by Na3EuTi2Nb2O12 is Orthorhombic Perovskite-derived structured and crystallizes in the monoclinic Pm space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 9-coordinate geometry to one O(12), one O(13), one O(3), one O(4), one O(5), one O(6), one O(9), and two equivalent O(14) atoms. In the second Na site, Na(2) is bonded in a 9-coordinate geometry to one O(10), one O(11), one O(14), one O(3), one O(4), one O(5), one O(6), and two equivalent O(9) atoms. In the third Na site, Na(3) is bonded in a 8-coordinate geometry to one O(2), one O(8), two equivalent O(11), two equivalent O(13), and two equivalent O(6) atoms. In the fourth Na site, Na(4) is bonded in a 8-coordinate geometry to one O(2), one O(8), two equivalent O(11), two equivalent O(13), and two equivalent O(3) atoms. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to one O(1), one O(7), two equivalent O(10), two equivalent O(12), and two equivalent O(5) atoms. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to one O(1), one O(7), two equivalent O(10), two equivalent O(12), and two equivalent O(4) atoms. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(10), one O(12), one O(14), one O(4), and one O(5) atom to form TiO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Nb(2)O6 octahedra, and corners with four equivalent Ti(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-26°. In the second Ti site, Ti(2) is bonded to one O(10), one O(12), one O(4), one O(5), one O(7), and one O(9) atom to form TiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Nb(1)O6 octahedra, and corners with four equivalent Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-26°. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(11), one O(13), one O(3), one O(6), one O(8), and one O(9) atom to form NbO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Nb(1)O6 octahedra, and corners with four equivalent Nb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 20-30°. In the second Nb site, Nb(2) is bonded to one O(11), one O(13), one O(14), one O(2), one O(3), and one O(6) atom to form NbO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Nb(2)O6 octahedra, and corners with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 20-30°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Eu(1), one Eu(2), and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(3), one Na(4), and two equivalent Nb(2) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(4), one Nb(1), and one Nb(2) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Eu(2), one Ti(1), and one Ti(2) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Eu(1), one Ti(1), and one Ti(2) atom. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one Nb(1), and one Nb(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Eu(1), one Eu(2), and two equivalent Ti(2) atoms. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Na(3), one Na(4), and two equivalent Nb(1) atoms. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Na(1), two equivalent Na(2), one Ti(2), and one Nb(1) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Na(2), one Eu(1), one Eu(2), one Ti(1), and one Ti(2) atom. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one Na(2), one Na(3), one Na(4), one Nb(1), and one Nb(2) atom. In the twelfth O site, O(12) is bonded in a 5-coordinate geometry to one Na(1), one Eu(1), one Eu(2), one Ti(1), and one Ti(2) atom. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one Na(1), one Na(3), one Na(4), one Nb(1), and one Nb(2) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Na(2), two equivalent Na(1), one Ti(1), and one Nb(2) atom. is represented by the CIF card [CIF]
data_Na3EuTi2Nb2O12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.533
_cell_length_b   5.615
_cell_length_c   15.626
_cell_angle_alpha   89.995
_cell_angle_beta   89.999
_cell_angle_gamma   89.878
_symmetry_Int_Tables_number   1
_cell_volume   485.459
_cell_formula_units_Z   2
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  0.001  0.988  0.371  1.0
  Na  Na1  1  0.001  0.988  0.880  1.0
  Na  Na2  1  0.500  0.488  0.880  1.0
  Na  Na3  1  0.500  0.488  0.371  1.0
  Na  Na4  1  0.508  0.532  0.625  1.0
  Na  Na5  1  0.994  0.031  0.625  1.0
  Eu  Eu6  1  0.502  0.540  0.125  1.0
  Eu  Eu7  1  0.998  0.039  0.125  1.0
  Ti  Ti8  1  0.005  0.519  0.252  1.0
  Ti  Ti9  1  0.496  0.019  0.252  1.0
  Ti  Ti10  1  0.496  0.019  0.998  1.0
  Ti  Ti11  1  0.005  0.519  0.998  1.0
  Nb  Nb12  1  0.496  0.019  0.752  1.0
  Nb  Nb13  1  0.496  0.019  0.499  1.0
  Nb  Nb14  1  0.007  0.518  0.498  1.0
  Nb  Nb15  1  0.007  0.518  0.752  1.0
  O  O16  1  0.068  0.473  0.125  1.0
  O  O17  1  0.069  0.476  0.625  1.0
  O  O18  1  0.206  0.203  0.481  1.0
  O  O19  1  0.215  0.205  0.992  1.0
  O  O20  1  0.215  0.205  0.258  1.0
  O  O21  1  0.206  0.203  0.769  1.0
  O  O22  1  0.284  0.704  0.258  1.0
  O  O23  1  0.293  0.703  0.481  1.0
  O  O24  1  0.293  0.703  0.769  1.0
  O  O25  1  0.284  0.704  0.992  1.0
  O  O26  1  0.431  0.973  0.125  1.0
  O  O27  1  0.430  0.976  0.625  1.0
  O  O28  1  0.565  0.005  0.878  1.0
  O  O29  1  0.565  0.005  0.372  1.0
  O  O30  1  0.716  0.270  0.025  1.0
  O  O31  1  0.716  0.270  0.225  1.0
  O  O32  1  0.710  0.282  0.517  1.0
  O  O33  1  0.710  0.282  0.733  1.0
  O  O34  1  0.783  0.770  0.225  1.0
  O  O35  1  0.788  0.781  0.733  1.0
  O  O36  1  0.783  0.771  0.025  1.0
  O  O37  1  0.788  0.781  0.517  1.0
  O  O38  1  0.934  0.505  0.372  1.0
  O  O39  1  0.934  0.505  0.878  1.0
[/CIF]
.