The compound described by NaLuP2O7 crystallizes in the monoclinic P2_1/c space group. Na(1) is bonded in a 7-coordinate geometry to one O(5), two equivalent O(1), two equivalent O(6), and two equivalent O(7) atoms. Lu(1) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(7) atom to form LuO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(4), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Lu(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 14-52°. In the second P site, P(2) is bonded to one O(2), one O(3), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent Lu(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 27-47°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Lu(1), and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Lu(1) and one P(2) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Lu(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Na(1), one Lu(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Na(1), one Lu(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Lu(1), and one P(1) atom. is represented by the CIF file [CIF]
data_NaLuP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.337
_cell_length_b   8.955
_cell_length_c   13.725
_cell_angle_alpha   63.914
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   589.156
_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  0.773  0.553  0.806  1.0
  Na  Na1  1  0.227  0.447  0.194  1.0
  Na  Na2  1  0.727  0.553  0.306  1.0
  Na  Na3  1  0.273  0.447  0.694  1.0
  Lu  Lu4  1  0.263  0.256  0.475  1.0
  Lu  Lu5  1  0.763  0.744  0.025  1.0
  Lu  Lu6  1  0.737  0.744  0.525  1.0
  Lu  Lu7  1  0.237  0.256  0.975  1.0
  P  P8  1  0.249  0.821  0.152  1.0
  P  P9  1  0.721  0.314  0.117  1.0
  P  P10  1  0.751  0.179  0.848  1.0
  P  P11  1  0.279  0.686  0.883  1.0
  P  P12  1  0.221  0.686  0.383  1.0
  P  P13  1  0.749  0.179  0.348  1.0
  P  P14  1  0.251  0.821  0.652  1.0
  P  P15  1  0.779  0.314  0.617  1.0
  O  O16  1  0.464  0.715  0.144  1.0
  O  O17  1  0.117  0.722  0.959  1.0
  O  O18  1  0.780  0.167  0.235  1.0
  O  O19  1  0.241  0.997  0.566  1.0
  O  O20  1  0.057  0.310  0.594  1.0
  O  O21  1  0.708  0.472  0.625  1.0
  O  O22  1  1.000  0.267  0.841  1.0
  O  O23  1  0.292  0.528  0.375  1.0
  O  O24  1  0.000  0.733  0.159  1.0
  O  O25  1  0.759  0.003  0.434  1.0
  O  O26  1  0.280  0.833  0.265  1.0
  O  O27  1  0.617  0.278  0.541  1.0
  O  O28  1  0.720  0.167  0.735  1.0
  O  O29  1  0.557  0.690  0.906  1.0
  O  O30  1  0.220  0.833  0.765  1.0
  O  O31  1  0.943  0.690  0.406  1.0
  O  O32  1  0.383  0.722  0.459  1.0
  O  O33  1  0.536  0.285  0.856  1.0
  O  O34  1  0.500  0.267  0.341  1.0
  O  O35  1  0.443  0.310  0.094  1.0
  O  O36  1  0.208  0.528  0.875  1.0
  O  O37  1  0.964  0.285  0.356  1.0
  O  O38  1  0.741  0.003  0.934  1.0
  O  O39  1  0.259  0.997  0.066  1.0
  O  O40  1  0.883  0.278  0.041  1.0
  O  O41  1  0.036  0.715  0.644  1.0
  O  O42  1  0.500  0.733  0.659  1.0
  O  O43  1  0.792  0.472  0.125  1.0
[/CIF]
.
The compound described by NaLuP2O7 crystallizes in the monoclinic P2_1/c space group. Na(1) is bonded in a 7-coordinate geometry to one O(5), two equivalent O(1), two equivalent O(6), and two equivalent O(7) atoms. Lu(1) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(7) atom to form LuO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(4), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Lu(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 14-52°. In the second P site, P(2) is bonded to one O(2), one O(3), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent Lu(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 27-47°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Lu(1), and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Lu(1) and one P(2) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Lu(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Na(1), one Lu(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Na(1), one Lu(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Lu(1), and one P(1) atom. is represented by the CIF file [CIF]
data_NaLuP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.337
_cell_length_b   8.955
_cell_length_c   13.725
_cell_angle_alpha   63.914
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   589.156
_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  0.773  0.553  0.806  1.0
  Na  Na1  1  0.227  0.447  0.194  1.0
  Na  Na2  1  0.727  0.553  0.306  1.0
  Na  Na3  1  0.273  0.447  0.694  1.0
  Lu  Lu4  1  0.263  0.256  0.475  1.0
  Lu  Lu5  1  0.763  0.744  0.025  1.0
  Lu  Lu6  1  0.737  0.744  0.525  1.0
  Lu  Lu7  1  0.237  0.256  0.975  1.0
  P  P8  1  0.249  0.821  0.152  1.0
  P  P9  1  0.721  0.314  0.117  1.0
  P  P10  1  0.751  0.179  0.848  1.0
  P  P11  1  0.279  0.686  0.883  1.0
  P  P12  1  0.221  0.686  0.383  1.0
  P  P13  1  0.749  0.179  0.348  1.0
  P  P14  1  0.251  0.821  0.652  1.0
  P  P15  1  0.779  0.314  0.617  1.0
  O  O16  1  0.464  0.715  0.144  1.0
  O  O17  1  0.117  0.722  0.959  1.0
  O  O18  1  0.780  0.167  0.235  1.0
  O  O19  1  0.241  0.997  0.566  1.0
  O  O20  1  0.057  0.310  0.594  1.0
  O  O21  1  0.708  0.472  0.625  1.0
  O  O22  1  1.000  0.267  0.841  1.0
  O  O23  1  0.292  0.528  0.375  1.0
  O  O24  1  0.000  0.733  0.159  1.0
  O  O25  1  0.759  0.003  0.434  1.0
  O  O26  1  0.280  0.833  0.265  1.0
  O  O27  1  0.617  0.278  0.541  1.0
  O  O28  1  0.720  0.167  0.735  1.0
  O  O29  1  0.557  0.690  0.906  1.0
  O  O30  1  0.220  0.833  0.765  1.0
  O  O31  1  0.943  0.690  0.406  1.0
  O  O32  1  0.383  0.722  0.459  1.0
  O  O33  1  0.536  0.285  0.856  1.0
  O  O34  1  0.500  0.267  0.341  1.0
  O  O35  1  0.443  0.310  0.094  1.0
  O  O36  1  0.208  0.528  0.875  1.0
  O  O37  1  0.964  0.285  0.356  1.0
  O  O38  1  0.741  0.003  0.934  1.0
  O  O39  1  0.259  0.997  0.066  1.0
  O  O40  1  0.883  0.278  0.041  1.0
  O  O41  1  0.036  0.715  0.644  1.0
  O  O42  1  0.500  0.733  0.659  1.0
  O  O43  1  0.792  0.472  0.125  1.0
[/CIF]
.