The structure described by Fe2Sb(PO4)3 crystallizes in the trigonal R-3c space group. Fe(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form FeO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. Sb(1) is bonded in a distorted hexagonal planar geometry to six equivalent O(2) atoms. P(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form PO4 tetrahedra that share corners with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-46°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Fe(1), one Sb(1), and one P(1) atom. is represented by the CIF card [CIF]
data_Fe2Sb(PO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.852
_cell_length_b   8.852
_cell_length_c   8.852
_cell_angle_alpha   58.794
_cell_angle_beta   58.794
_cell_angle_gamma   58.794
_symmetry_Int_Tables_number   1
_cell_volume   476.937
_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
  Fe  Fe0  1  0.851  0.851  0.851  1.0
  Fe  Fe1  1  0.649  0.649  0.649  1.0
  Fe  Fe2  1  0.351  0.351  0.351  1.0
  Fe  Fe3  1  0.149  0.149  0.149  1.0
  Sb  Sb4  1  0.000  0.000  0.000  1.0
  Sb  Sb5  1  0.500  0.500  0.500  1.0
  P  P6  1  0.541  0.959  0.250  1.0
  P  P7  1  0.250  0.541  0.959  1.0
  P  P8  1  0.959  0.250  0.541  1.0
  P  P9  1  0.041  0.750  0.459  1.0
  P  P10  1  0.750  0.459  0.041  1.0
  P  P11  1  0.459  0.041  0.750  1.0
  O  O12  1  0.493  0.884  0.697  1.0
  O  O13  1  0.884  0.697  0.493  1.0
  O  O14  1  0.733  0.940  0.083  1.0
  O  O15  1  0.697  0.493  0.884  1.0
  O  O16  1  0.384  0.993  0.197  1.0
  O  O17  1  0.560  0.767  0.417  1.0
  O  O18  1  0.083  0.733  0.940  1.0
  O  O19  1  0.417  0.560  0.767  1.0
  O  O20  1  0.007  0.803  0.616  1.0
  O  O21  1  0.767  0.417  0.560  1.0
  O  O22  1  0.060  0.917  0.267  1.0
  O  O23  1  0.803  0.616  0.007  1.0
  O  O24  1  0.197  0.384  0.993  1.0
  O  O25  1  0.940  0.083  0.733  1.0
  O  O26  1  0.233  0.583  0.440  1.0
  O  O27  1  0.993  0.197  0.384  1.0
  O  O28  1  0.583  0.440  0.233  1.0
  O  O29  1  0.917  0.267  0.060  1.0
  O  O30  1  0.440  0.233  0.583  1.0
  O  O31  1  0.616  0.007  0.803  1.0
  O  O32  1  0.303  0.507  0.116  1.0
  O  O33  1  0.267  0.060  0.917  1.0
  O  O34  1  0.116  0.303  0.507  1.0
  O  O35  1  0.507  0.116  0.303  1.0
[/CIF]
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The structure described by Fe2Sb(PO4)3 crystallizes in the trigonal R-3c space group. Fe(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form FeO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. Sb(1) is bonded in a distorted hexagonal planar geometry to six equivalent O(2) atoms. P(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form PO4 tetrahedra that share corners with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-46°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Fe(1), one Sb(1), and one P(1) atom. is represented by the CIF card [CIF]
data_Fe2Sb(PO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.852
_cell_length_b   8.852
_cell_length_c   8.852
_cell_angle_alpha   58.794
_cell_angle_beta   58.794
_cell_angle_gamma   58.794
_symmetry_Int_Tables_number   1
_cell_volume   476.937
_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
  Fe  Fe0  1  0.851  0.851  0.851  1.0
  Fe  Fe1  1  0.649  0.649  0.649  1.0
  Fe  Fe2  1  0.351  0.351  0.351  1.0
  Fe  Fe3  1  0.149  0.149  0.149  1.0
  Sb  Sb4  1  0.000  0.000  0.000  1.0
  Sb  Sb5  1  0.500  0.500  0.500  1.0
  P  P6  1  0.541  0.959  0.250  1.0
  P  P7  1  0.250  0.541  0.959  1.0
  P  P8  1  0.959  0.250  0.541  1.0
  P  P9  1  0.041  0.750  0.459  1.0
  P  P10  1  0.750  0.459  0.041  1.0
  P  P11  1  0.459  0.041  0.750  1.0
  O  O12  1  0.493  0.884  0.697  1.0
  O  O13  1  0.884  0.697  0.493  1.0
  O  O14  1  0.733  0.940  0.083  1.0
  O  O15  1  0.697  0.493  0.884  1.0
  O  O16  1  0.384  0.993  0.197  1.0
  O  O17  1  0.560  0.767  0.417  1.0
  O  O18  1  0.083  0.733  0.940  1.0
  O  O19  1  0.417  0.560  0.767  1.0
  O  O20  1  0.007  0.803  0.616  1.0
  O  O21  1  0.767  0.417  0.560  1.0
  O  O22  1  0.060  0.917  0.267  1.0
  O  O23  1  0.803  0.616  0.007  1.0
  O  O24  1  0.197  0.384  0.993  1.0
  O  O25  1  0.940  0.083  0.733  1.0
  O  O26  1  0.233  0.583  0.440  1.0
  O  O27  1  0.993  0.197  0.384  1.0
  O  O28  1  0.583  0.440  0.233  1.0
  O  O29  1  0.917  0.267  0.060  1.0
  O  O30  1  0.440  0.233  0.583  1.0
  O  O31  1  0.616  0.007  0.803  1.0
  O  O32  1  0.303  0.507  0.116  1.0
  O  O33  1  0.267  0.060  0.917  1.0
  O  O34  1  0.116  0.303  0.507  1.0
  O  O35  1  0.507  0.116  0.303  1.0
[/CIF]
.