The compound described by NaEuP2O7 crystallizes in the monoclinic P2_1/c space group. Na(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(6), two equivalent O(5), and two equivalent O(7) atoms. Eu(1) is bonded in a 8-coordinate geometry to one O(3), one O(5), one O(6), one O(7), two equivalent O(2), and two equivalent O(4) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing PO4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form corner-sharing PO4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Eu(1), and one P(2) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one Eu(1), and one P(2) atom. In the third O site, O(7) is bonded in a 1-coordinate geometry to two equivalent Na(1), one Eu(1), and one P(2) atom. In the fourth O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(2) is bonded in a distorted single-bond geometry to one Na(1), two equivalent Eu(1), and one P(1) atom. In the sixth O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one Eu(1), and one P(1) atom. In the seventh O site, O(4) is bonded in a distorted single-bond geometry to one Na(1), two equivalent Eu(1), and one P(1) atom. is represented by the CIF file [CIF]
data_NaEuP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.617
_cell_length_b   5.355
_cell_length_c   13.713
_cell_angle_alpha   68.391
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   588.313
_cell_formula_units_Z   4
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  0.885  0.641  0.078  1.0
  Na  Na1  1  0.385  0.359  0.422  1.0
  Na  Na2  1  0.115  0.359  0.922  1.0
  Na  Na3  1  0.615  0.641  0.578  1.0
  Eu  Eu4  1  0.695  0.962  0.267  1.0
  Eu  Eu5  1  0.195  0.038  0.233  1.0
  Eu  Eu6  1  0.305  0.038  0.733  1.0
  Eu  Eu7  1  0.805  0.962  0.767  1.0
  P  P8  1  0.494  0.580  0.182  1.0
  P  P9  1  0.994  0.420  0.318  1.0
  P  P10  1  0.506  0.420  0.818  1.0
  P  P11  1  0.006  0.580  0.682  1.0
  P  P12  1  0.243  0.730  0.033  1.0
  P  P13  1  0.743  0.270  0.467  1.0
  P  P14  1  0.757  0.270  0.967  1.0
  P  P15  1  0.257  0.730  0.533  1.0
  O  O16  1  0.426  0.688  0.064  1.0
  O  O17  1  0.926  0.312  0.436  1.0
  O  O18  1  0.574  0.312  0.936  1.0
  O  O19  1  0.074  0.688  0.564  1.0
  O  O20  1  0.923  0.251  0.259  1.0
  O  O21  1  0.423  0.749  0.241  1.0
  O  O22  1  0.077  0.749  0.741  1.0
  O  O23  1  0.577  0.251  0.759  1.0
  O  O24  1  0.668  0.633  0.175  1.0
  O  O25  1  0.168  0.367  0.325  1.0
  O  O26  1  0.332  0.367  0.825  1.0
  O  O27  1  0.832  0.633  0.675  1.0
  O  O28  1  0.457  0.277  0.232  1.0
  O  O29  1  0.957  0.723  0.268  1.0
  O  O30  1  0.543  0.723  0.768  1.0
  O  O31  1  0.043  0.277  0.732  1.0
  O  O32  1  0.840  0.541  0.915  1.0
  O  O33  1  0.340  0.459  0.585  1.0
  O  O34  1  0.160  0.459  0.085  1.0
  O  O35  1  0.660  0.541  0.415  1.0
  O  O36  1  0.740  0.189  0.586  1.0
  O  O37  1  0.240  0.811  0.914  1.0
  O  O38  1  0.260  0.811  0.414  1.0
  O  O39  1  0.760  0.189  0.086  1.0
  O  O40  1  0.823  0.057  0.929  1.0
  O  O41  1  0.323  0.943  0.571  1.0
  O  O42  1  0.177  0.943  0.071  1.0
  O  O43  1  0.677  0.057  0.429  1.0
[/CIF]
.
The compound described by NaEuP2O7 crystallizes in the monoclinic P2_1/c space group. Na(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(6), two equivalent O(5), and two equivalent O(7) atoms. Eu(1) is bonded in a 8-coordinate geometry to one O(3), one O(5), one O(6), one O(7), two equivalent O(2), and two equivalent O(4) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing PO4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form corner-sharing PO4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Eu(1), and one P(2) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one Eu(1), and one P(2) atom. In the third O site, O(7) is bonded in a 1-coordinate geometry to two equivalent Na(1), one Eu(1), and one P(2) atom. In the fourth O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(2) is bonded in a distorted single-bond geometry to one Na(1), two equivalent Eu(1), and one P(1) atom. In the sixth O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one Eu(1), and one P(1) atom. In the seventh O site, O(4) is bonded in a distorted single-bond geometry to one Na(1), two equivalent Eu(1), and one P(1) atom. is represented by the CIF file [CIF]
data_NaEuP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.617
_cell_length_b   5.355
_cell_length_c   13.713
_cell_angle_alpha   68.391
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   588.313
_cell_formula_units_Z   4
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  0.885  0.641  0.078  1.0
  Na  Na1  1  0.385  0.359  0.422  1.0
  Na  Na2  1  0.115  0.359  0.922  1.0
  Na  Na3  1  0.615  0.641  0.578  1.0
  Eu  Eu4  1  0.695  0.962  0.267  1.0
  Eu  Eu5  1  0.195  0.038  0.233  1.0
  Eu  Eu6  1  0.305  0.038  0.733  1.0
  Eu  Eu7  1  0.805  0.962  0.767  1.0
  P  P8  1  0.494  0.580  0.182  1.0
  P  P9  1  0.994  0.420  0.318  1.0
  P  P10  1  0.506  0.420  0.818  1.0
  P  P11  1  0.006  0.580  0.682  1.0
  P  P12  1  0.243  0.730  0.033  1.0
  P  P13  1  0.743  0.270  0.467  1.0
  P  P14  1  0.757  0.270  0.967  1.0
  P  P15  1  0.257  0.730  0.533  1.0
  O  O16  1  0.426  0.688  0.064  1.0
  O  O17  1  0.926  0.312  0.436  1.0
  O  O18  1  0.574  0.312  0.936  1.0
  O  O19  1  0.074  0.688  0.564  1.0
  O  O20  1  0.923  0.251  0.259  1.0
  O  O21  1  0.423  0.749  0.241  1.0
  O  O22  1  0.077  0.749  0.741  1.0
  O  O23  1  0.577  0.251  0.759  1.0
  O  O24  1  0.668  0.633  0.175  1.0
  O  O25  1  0.168  0.367  0.325  1.0
  O  O26  1  0.332  0.367  0.825  1.0
  O  O27  1  0.832  0.633  0.675  1.0
  O  O28  1  0.457  0.277  0.232  1.0
  O  O29  1  0.957  0.723  0.268  1.0
  O  O30  1  0.543  0.723  0.768  1.0
  O  O31  1  0.043  0.277  0.732  1.0
  O  O32  1  0.840  0.541  0.915  1.0
  O  O33  1  0.340  0.459  0.585  1.0
  O  O34  1  0.160  0.459  0.085  1.0
  O  O35  1  0.660  0.541  0.415  1.0
  O  O36  1  0.740  0.189  0.586  1.0
  O  O37  1  0.240  0.811  0.914  1.0
  O  O38  1  0.260  0.811  0.414  1.0
  O  O39  1  0.760  0.189  0.086  1.0
  O  O40  1  0.823  0.057  0.929  1.0
  O  O41  1  0.323  0.943  0.571  1.0
  O  O42  1  0.177  0.943  0.071  1.0
  O  O43  1  0.677  0.057  0.429  1.0
[/CIF]
.