The material structure described by Na2ZnP2O7 crystallizes in the tetragonal P4_2/mnm space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. In the second Na site, Na(2) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. Zn(1) is bonded to four equivalent O(1) atoms to form ZnO4 tetrahedra that share corners with four equivalent P(1)O4 tetrahedra. P(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with two equivalent Zn(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(2) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Na(2), and one P(1) atom. In the second O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Na(1) and two equivalent P(1) atoms. In the third O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Zn(1), and one P(1) atom. is represented by the CIF file [CIF]
data_Na2ZnP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.834
_cell_length_b   7.834
_cell_length_c   10.420
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   639.479
_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  0.806  0.194  0.500  1.0
  Na  Na1  1  0.646  0.646  0.500  1.0
  Na  Na2  1  0.146  0.854  0.000  1.0
  Na  Na3  1  0.194  0.806  0.500  1.0
  Na  Na4  1  0.854  0.146  0.000  1.0
  Na  Na5  1  0.694  0.694  0.000  1.0
  Na  Na6  1  0.306  0.306  0.000  1.0
  Na  Na7  1  0.354  0.354  0.500  1.0
  Zn  Zn8  1  0.500  0.000  0.250  1.0
  Zn  Zn9  1  0.000  0.500  0.250  1.0
  Zn  Zn10  1  0.000  0.500  0.750  1.0
  Zn  Zn11  1  0.500  0.000  0.750  1.0
  P  P12  1  0.362  0.638  0.789  1.0
  P  P13  1  0.638  0.362  0.789  1.0
  P  P14  1  0.862  0.862  0.711  1.0
  P  P15  1  0.362  0.638  0.211  1.0
  P  P16  1  0.862  0.862  0.289  1.0
  P  P17  1  0.138  0.138  0.711  1.0
  P  P18  1  0.138  0.138  0.289  1.0
  P  P19  1  0.638  0.362  0.211  1.0
  O  O20  1  0.080  0.306  0.353  1.0
  O  O21  1  0.920  0.694  0.353  1.0
  O  O22  1  0.306  0.080  0.647  1.0
  O  O23  1  0.806  0.420  0.853  1.0
  O  O24  1  0.194  0.580  0.853  1.0
  O  O25  1  0.420  0.806  0.147  1.0
  O  O26  1  0.580  0.194  0.147  1.0
  O  O27  1  0.694  0.920  0.647  1.0
  O  O28  1  0.920  0.694  0.647  1.0
  O  O29  1  0.080  0.306  0.647  1.0
  O  O30  1  0.694  0.920  0.353  1.0
  O  O31  1  0.194  0.580  0.147  1.0
  O  O32  1  0.806  0.420  0.147  1.0
  O  O33  1  0.580  0.194  0.853  1.0
  O  O34  1  0.420  0.806  0.853  1.0
  O  O35  1  0.306  0.080  0.353  1.0
  O  O36  1  0.864  0.864  0.857  1.0
  O  O37  1  0.136  0.136  0.857  1.0
  O  O38  1  0.864  0.864  0.143  1.0
  O  O39  1  0.364  0.636  0.357  1.0
  O  O40  1  0.000  0.000  0.345  1.0
  O  O41  1  0.500  0.500  0.845  1.0
  O  O42  1  0.500  0.500  0.155  1.0
  O  O43  1  0.000  0.000  0.655  1.0
  O  O44  1  0.136  0.136  0.143  1.0
  O  O45  1  0.364  0.636  0.643  1.0
  O  O46  1  0.636  0.364  0.643  1.0
  O  O47  1  0.636  0.364  0.357  1.0
[/CIF]
.
The material structure described by Na2ZnP2O7 crystallizes in the tetragonal P4_2/mnm space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. In the second Na site, Na(2) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. Zn(1) is bonded to four equivalent O(1) atoms to form ZnO4 tetrahedra that share corners with four equivalent P(1)O4 tetrahedra. P(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with two equivalent Zn(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(2) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Na(2), and one P(1) atom. In the second O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Na(1) and two equivalent P(1) atoms. In the third O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Zn(1), and one P(1) atom. is represented by the CIF file [CIF]
data_Na2ZnP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.834
_cell_length_b   7.834
_cell_length_c   10.420
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   639.479
_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  0.806  0.194  0.500  1.0
  Na  Na1  1  0.646  0.646  0.500  1.0
  Na  Na2  1  0.146  0.854  0.000  1.0
  Na  Na3  1  0.194  0.806  0.500  1.0
  Na  Na4  1  0.854  0.146  0.000  1.0
  Na  Na5  1  0.694  0.694  0.000  1.0
  Na  Na6  1  0.306  0.306  0.000  1.0
  Na  Na7  1  0.354  0.354  0.500  1.0
  Zn  Zn8  1  0.500  0.000  0.250  1.0
  Zn  Zn9  1  0.000  0.500  0.250  1.0
  Zn  Zn10  1  0.000  0.500  0.750  1.0
  Zn  Zn11  1  0.500  0.000  0.750  1.0
  P  P12  1  0.362  0.638  0.789  1.0
  P  P13  1  0.638  0.362  0.789  1.0
  P  P14  1  0.862  0.862  0.711  1.0
  P  P15  1  0.362  0.638  0.211  1.0
  P  P16  1  0.862  0.862  0.289  1.0
  P  P17  1  0.138  0.138  0.711  1.0
  P  P18  1  0.138  0.138  0.289  1.0
  P  P19  1  0.638  0.362  0.211  1.0
  O  O20  1  0.080  0.306  0.353  1.0
  O  O21  1  0.920  0.694  0.353  1.0
  O  O22  1  0.306  0.080  0.647  1.0
  O  O23  1  0.806  0.420  0.853  1.0
  O  O24  1  0.194  0.580  0.853  1.0
  O  O25  1  0.420  0.806  0.147  1.0
  O  O26  1  0.580  0.194  0.147  1.0
  O  O27  1  0.694  0.920  0.647  1.0
  O  O28  1  0.920  0.694  0.647  1.0
  O  O29  1  0.080  0.306  0.647  1.0
  O  O30  1  0.694  0.920  0.353  1.0
  O  O31  1  0.194  0.580  0.147  1.0
  O  O32  1  0.806  0.420  0.147  1.0
  O  O33  1  0.580  0.194  0.853  1.0
  O  O34  1  0.420  0.806  0.853  1.0
  O  O35  1  0.306  0.080  0.353  1.0
  O  O36  1  0.864  0.864  0.857  1.0
  O  O37  1  0.136  0.136  0.857  1.0
  O  O38  1  0.864  0.864  0.143  1.0
  O  O39  1  0.364  0.636  0.357  1.0
  O  O40  1  0.000  0.000  0.345  1.0
  O  O41  1  0.500  0.500  0.845  1.0
  O  O42  1  0.500  0.500  0.155  1.0
  O  O43  1  0.000  0.000  0.655  1.0
  O  O44  1  0.136  0.136  0.143  1.0
  O  O45  1  0.364  0.636  0.643  1.0
  O  O46  1  0.636  0.364  0.643  1.0
  O  O47  1  0.636  0.364  0.357  1.0
[/CIF]
.