The crystal structure described by Na2FeSn(PO4)3 crystallizes in the monoclinic C2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to one O(1), one O(3), one O(5), one O(6), one O(7), one O(8), and two equivalent O(9) atoms. In the second Na site, Na(2) is bonded in a distorted hexagonal planar geometry to one O(10), one O(11), one O(12), one O(7), one O(8), and one O(9) atom. Fe(1) is bonded to one O(1), one O(2), one O(3), one O(7), one O(8), and one O(9) atom to form FeO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. Sn(1) is bonded to one O(10), one O(11), one O(12), one O(4), one O(5), and one O(6) atom to form SnO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to two equivalent O(1) and two equivalent O(12) atoms to form PO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-40°. In the second P site, P(2) is bonded to one O(10), one O(11), one O(2), and one O(3) atom to form PO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-41°. In the third P site, P(3) is bonded to one O(4), one O(5), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-37°. In the fourth P site, P(4) is bonded to two equivalent O(6) and two equivalent O(7) atoms to form PO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-36°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Fe(1), and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one Fe(1), and one P(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(3) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Sn(1), and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Sn(1), and one P(4) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Fe(1), and one P(4) atom. In the eighth O site, O(8) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Fe(1), and one P(3) atom. In the ninth O site, O(9) is bonded to one Na(2), two equivalent Na(1), one Fe(1), and one P(3) atom to form distorted corner-sharing ONa3FeP trigonal bipyramids. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Na(2), one Sn(1), and one P(2) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Na(2), one Sn(1), and one P(2) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Na(2), one Sn(1), and one P(1) atom. is represented by the CIF card [CIF]
data_Na2FeSn(PO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.816
_cell_length_b   8.816
_cell_length_c   8.956
_cell_angle_alpha   60.484
_cell_angle_beta   60.484
_cell_angle_gamma   59.948
_symmetry_Int_Tables_number   1
_cell_volume   495.520
_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  0.383  0.248  0.501  1.0
  Na  Na1  1  0.752  0.617  0.499  1.0
  Na  Na2  1  0.482  0.996  0.256  1.0
  Na  Na3  1  0.004  0.518  0.744  1.0
  Fe  Fe4  1  0.344  0.849  0.701  1.0
  Fe  Fe5  1  0.151  0.656  0.299  1.0
  Sn  Sn6  1  0.858  0.353  0.182  1.0
  Sn  Sn7  1  0.647  0.142  0.818  1.0
  P  P8  1  0.542  0.458  0.000  1.0
  P  P9  1  0.956  0.748  0.007  1.0
  P  P10  1  0.252  0.044  0.993  1.0
  P  P11  1  0.047  0.248  0.499  1.0
  P  P12  1  0.752  0.953  0.501  1.0
  P  P13  1  0.455  0.545  0.500  1.0
  O  O14  1  0.512  0.617  0.825  1.0
  O  O15  1  0.118  0.793  0.838  1.0
  O  O16  1  0.301  0.020  0.814  1.0
  O  O17  1  0.020  0.279  0.327  1.0
  O  O18  1  0.771  0.129  0.332  1.0
  O  O19  1  0.630  0.518  0.331  1.0
  O  O20  1  0.482  0.370  0.669  1.0
  O  O21  1  0.871  0.229  0.668  1.0
  O  O22  1  0.721  0.980  0.673  1.0
  O  O23  1  0.980  0.699  0.186  1.0
  O  O24  1  0.207  0.882  0.162  1.0
  O  O25  1  0.383  0.488  0.175  1.0
  O  O26  1  0.436  0.720  0.517  1.0
  O  O27  1  0.226  0.081  0.515  1.0
  O  O28  1  0.582  0.931  0.513  1.0
  O  O29  1  0.937  0.583  0.003  1.0
  O  O30  1  0.084  0.229  0.997  1.0
  O  O31  1  0.728  0.439  0.001  1.0
  O  O32  1  0.561  0.272  0.999  1.0
  O  O33  1  0.771  0.916  0.003  1.0
  O  O34  1  0.417  0.063  0.997  1.0
  O  O35  1  0.069  0.418  0.487  1.0
  O  O36  1  0.919  0.774  0.485  1.0
  O  O37  1  0.280  0.564  0.483  1.0
[/CIF]
.
The crystal structure described by Na2FeSn(PO4)3 crystallizes in the monoclinic C2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to one O(1), one O(3), one O(5), one O(6), one O(7), one O(8), and two equivalent O(9) atoms. In the second Na site, Na(2) is bonded in a distorted hexagonal planar geometry to one O(10), one O(11), one O(12), one O(7), one O(8), and one O(9) atom. Fe(1) is bonded to one O(1), one O(2), one O(3), one O(7), one O(8), and one O(9) atom to form FeO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. Sn(1) is bonded to one O(10), one O(11), one O(12), one O(4), one O(5), and one O(6) atom to form SnO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to two equivalent O(1) and two equivalent O(12) atoms to form PO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-40°. In the second P site, P(2) is bonded to one O(10), one O(11), one O(2), and one O(3) atom to form PO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-41°. In the third P site, P(3) is bonded to one O(4), one O(5), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-37°. In the fourth P site, P(4) is bonded to two equivalent O(6) and two equivalent O(7) atoms to form PO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-36°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Fe(1), and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Na(1), one Fe(1), and one P(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(3) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Sn(1), and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Na(1), one Sn(1), and one P(4) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(2), one Fe(1), and one P(4) atom. In the eighth O site, O(8) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Fe(1), and one P(3) atom. In the ninth O site, O(9) is bonded to one Na(2), two equivalent Na(1), one Fe(1), and one P(3) atom to form distorted corner-sharing ONa3FeP trigonal bipyramids. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Na(2), one Sn(1), and one P(2) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Na(2), one Sn(1), and one P(2) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Na(2), one Sn(1), and one P(1) atom. is represented by the CIF card [CIF]
data_Na2FeSn(PO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.816
_cell_length_b   8.816
_cell_length_c   8.956
_cell_angle_alpha   60.484
_cell_angle_beta   60.484
_cell_angle_gamma   59.948
_symmetry_Int_Tables_number   1
_cell_volume   495.520
_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  0.383  0.248  0.501  1.0
  Na  Na1  1  0.752  0.617  0.499  1.0
  Na  Na2  1  0.482  0.996  0.256  1.0
  Na  Na3  1  0.004  0.518  0.744  1.0
  Fe  Fe4  1  0.344  0.849  0.701  1.0
  Fe  Fe5  1  0.151  0.656  0.299  1.0
  Sn  Sn6  1  0.858  0.353  0.182  1.0
  Sn  Sn7  1  0.647  0.142  0.818  1.0
  P  P8  1  0.542  0.458  0.000  1.0
  P  P9  1  0.956  0.748  0.007  1.0
  P  P10  1  0.252  0.044  0.993  1.0
  P  P11  1  0.047  0.248  0.499  1.0
  P  P12  1  0.752  0.953  0.501  1.0
  P  P13  1  0.455  0.545  0.500  1.0
  O  O14  1  0.512  0.617  0.825  1.0
  O  O15  1  0.118  0.793  0.838  1.0
  O  O16  1  0.301  0.020  0.814  1.0
  O  O17  1  0.020  0.279  0.327  1.0
  O  O18  1  0.771  0.129  0.332  1.0
  O  O19  1  0.630  0.518  0.331  1.0
  O  O20  1  0.482  0.370  0.669  1.0
  O  O21  1  0.871  0.229  0.668  1.0
  O  O22  1  0.721  0.980  0.673  1.0
  O  O23  1  0.980  0.699  0.186  1.0
  O  O24  1  0.207  0.882  0.162  1.0
  O  O25  1  0.383  0.488  0.175  1.0
  O  O26  1  0.436  0.720  0.517  1.0
  O  O27  1  0.226  0.081  0.515  1.0
  O  O28  1  0.582  0.931  0.513  1.0
  O  O29  1  0.937  0.583  0.003  1.0
  O  O30  1  0.084  0.229  0.997  1.0
  O  O31  1  0.728  0.439  0.001  1.0
  O  O32  1  0.561  0.272  0.999  1.0
  O  O33  1  0.771  0.916  0.003  1.0
  O  O34  1  0.417  0.063  0.997  1.0
  O  O35  1  0.069  0.418  0.487  1.0
  O  O36  1  0.919  0.774  0.485  1.0
  O  O37  1  0.280  0.564  0.483  1.0
[/CIF]
.