The crystal structure described by Sb2P5O16 crystallizes in the monoclinic Pc space group. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(1), one O(13), one O(14), one O(16), one O(2), and one O(4) atom to form SbO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(5)O4 tetrahedra. In the second Sb site, Sb(2) is bonded to one O(11), one O(12), one O(15), one O(3), one O(6), and one O(7) atom to form SbO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. There are five inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(10), one O(3), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-55°. In the second P site, P(2) is bonded to one O(10), one O(4), one O(6), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 10-57°. In the third P site, P(3) is bonded to one O(2), one O(7), one O(8), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-55°. In the fourth P site, P(4) is bonded to one O(11), one O(12), one O(13), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-42°. In the fifth P site, P(5) is bonded to one O(14), one O(15), one O(16), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(2)O6 octahedra, corners with two equivalent Sb(1)O6 octahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 38-47°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Sb(1) and one P(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Sb(1) and one P(3) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Sb(2) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Sb(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one P(1) and one P(4) atom. In the sixth O site, O(6) is bonded in a distorted linear geometry to one Sb(2) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Sb(2) and one P(3) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one P(3) and one P(5) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one P(2) and one P(3) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one Sb(2) and one P(4) atom. In the twelfth O site, O(12) is bonded in a distorted bent 150 degrees geometry to one Sb(2) and one P(4) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one Sb(1) and one P(4) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Sb(1) and one P(5) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 120 degrees geometry to one Sb(2) and one P(5) atom. In the sixteenth O site, O(16) is bonded in a distorted bent 150 degrees geometry to one Sb(1) and one P(5) atom. is represented by the CIF card [CIF]
data_Sb2P5O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.444
_cell_length_b   7.565
_cell_length_c   10.702
_cell_angle_alpha   69.239
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   790.588
_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
  Sb  Sb0  1  0.371  0.922  0.872  1.0
  Sb  Sb1  1  0.629  0.922  0.372  1.0
  Sb  Sb2  1  0.859  0.378  0.982  1.0
  Sb  Sb3  1  0.141  0.378  0.482  1.0
  P  P4  1  0.148  0.607  0.882  1.0
  P  P5  1  0.705  0.552  0.628  1.0
  P  P6  1  0.852  0.607  0.382  1.0
  P  P7  1  0.467  0.502  0.509  1.0
  P  P8  1  0.117  0.258  0.824  1.0
  P  P9  1  0.295  0.552  0.128  1.0
  P  P10  1  0.533  0.502  0.009  1.0
  P  P11  1  0.883  0.258  0.324  1.0
  P  P12  1  0.412  0.114  0.533  1.0
  P  P13  1  0.588  0.114  0.033  1.0
  O  O14  1  0.219  0.790  0.806  1.0
  O  O15  1  0.478  0.666  0.892  1.0
  O  O16  1  0.011  0.628  0.915  1.0
  O  O17  1  0.693  0.768  0.572  1.0
  O  O18  1  0.781  0.790  0.306  1.0
  O  O19  1  0.165  0.475  0.796  1.0
  O  O20  1  0.522  0.666  0.392  1.0
  O  O21  1  0.989  0.628  0.415  1.0
  O  O22  1  0.768  0.467  0.760  1.0
  O  O23  1  0.307  0.768  0.072  1.0
  O  O24  1  0.334  0.511  0.556  1.0
  O  O25  1  0.516  0.317  0.968  1.0
  O  O26  1  0.565  0.460  0.635  1.0
  O  O27  1  0.775  0.488  0.517  1.0
  O  O28  1  0.007  0.219  0.925  1.0
  O  O29  1  0.835  0.475  0.296  1.0
  O  O30  1  0.232  0.467  0.260  1.0
  O  O31  1  0.076  0.257  0.687  1.0
  O  O32  1  0.666  0.511  0.056  1.0
  O  O33  1  0.235  0.135  0.884  1.0
  O  O34  1  0.484  0.317  0.468  1.0
  O  O35  1  0.435  0.460  0.135  1.0
  O  O36  1  0.225  0.488  0.017  1.0
  O  O37  1  0.541  0.002  0.947  1.0
  O  O38  1  0.993  0.219  0.425  1.0
  O  O39  1  0.267  0.138  0.521  1.0
  O  O40  1  0.924  0.257  0.187  1.0
  O  O41  1  0.459  0.029  0.679  1.0
  O  O42  1  0.765  0.135  0.384  1.0
  O  O43  1  0.459  0.002  0.447  1.0
  O  O44  1  0.733  0.138  0.021  1.0
  O  O45  1  0.541  0.029  0.179  1.0
[/CIF]
.
The crystal structure described by Sb2P5O16 crystallizes in the monoclinic Pc space group. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(1), one O(13), one O(14), one O(16), one O(2), and one O(4) atom to form SbO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(5)O4 tetrahedra. In the second Sb site, Sb(2) is bonded to one O(11), one O(12), one O(15), one O(3), one O(6), and one O(7) atom to form SbO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. There are five inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(10), one O(3), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-55°. In the second P site, P(2) is bonded to one O(10), one O(4), one O(6), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 10-57°. In the third P site, P(3) is bonded to one O(2), one O(7), one O(8), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-55°. In the fourth P site, P(4) is bonded to one O(11), one O(12), one O(13), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-42°. In the fifth P site, P(5) is bonded to one O(14), one O(15), one O(16), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(2)O6 octahedra, corners with two equivalent Sb(1)O6 octahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 38-47°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Sb(1) and one P(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Sb(1) and one P(3) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Sb(2) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Sb(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one P(1) and one P(4) atom. In the sixth O site, O(6) is bonded in a distorted linear geometry to one Sb(2) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Sb(2) and one P(3) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one P(3) and one P(5) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one P(2) and one P(3) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one Sb(2) and one P(4) atom. In the twelfth O site, O(12) is bonded in a distorted bent 150 degrees geometry to one Sb(2) and one P(4) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one Sb(1) and one P(4) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Sb(1) and one P(5) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 120 degrees geometry to one Sb(2) and one P(5) atom. In the sixteenth O site, O(16) is bonded in a distorted bent 150 degrees geometry to one Sb(1) and one P(5) atom. is represented by the CIF card [CIF]
data_Sb2P5O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.444
_cell_length_b   7.565
_cell_length_c   10.702
_cell_angle_alpha   69.239
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   790.588
_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
  Sb  Sb0  1  0.371  0.922  0.872  1.0
  Sb  Sb1  1  0.629  0.922  0.372  1.0
  Sb  Sb2  1  0.859  0.378  0.982  1.0
  Sb  Sb3  1  0.141  0.378  0.482  1.0
  P  P4  1  0.148  0.607  0.882  1.0
  P  P5  1  0.705  0.552  0.628  1.0
  P  P6  1  0.852  0.607  0.382  1.0
  P  P7  1  0.467  0.502  0.509  1.0
  P  P8  1  0.117  0.258  0.824  1.0
  P  P9  1  0.295  0.552  0.128  1.0
  P  P10  1  0.533  0.502  0.009  1.0
  P  P11  1  0.883  0.258  0.324  1.0
  P  P12  1  0.412  0.114  0.533  1.0
  P  P13  1  0.588  0.114  0.033  1.0
  O  O14  1  0.219  0.790  0.806  1.0
  O  O15  1  0.478  0.666  0.892  1.0
  O  O16  1  0.011  0.628  0.915  1.0
  O  O17  1  0.693  0.768  0.572  1.0
  O  O18  1  0.781  0.790  0.306  1.0
  O  O19  1  0.165  0.475  0.796  1.0
  O  O20  1  0.522  0.666  0.392  1.0
  O  O21  1  0.989  0.628  0.415  1.0
  O  O22  1  0.768  0.467  0.760  1.0
  O  O23  1  0.307  0.768  0.072  1.0
  O  O24  1  0.334  0.511  0.556  1.0
  O  O25  1  0.516  0.317  0.968  1.0
  O  O26  1  0.565  0.460  0.635  1.0
  O  O27  1  0.775  0.488  0.517  1.0
  O  O28  1  0.007  0.219  0.925  1.0
  O  O29  1  0.835  0.475  0.296  1.0
  O  O30  1  0.232  0.467  0.260  1.0
  O  O31  1  0.076  0.257  0.687  1.0
  O  O32  1  0.666  0.511  0.056  1.0
  O  O33  1  0.235  0.135  0.884  1.0
  O  O34  1  0.484  0.317  0.468  1.0
  O  O35  1  0.435  0.460  0.135  1.0
  O  O36  1  0.225  0.488  0.017  1.0
  O  O37  1  0.541  0.002  0.947  1.0
  O  O38  1  0.993  0.219  0.425  1.0
  O  O39  1  0.267  0.138  0.521  1.0
  O  O40  1  0.924  0.257  0.187  1.0
  O  O41  1  0.459  0.029  0.679  1.0
  O  O42  1  0.765  0.135  0.384  1.0
  O  O43  1  0.459  0.002  0.447  1.0
  O  O44  1  0.733  0.138  0.021  1.0
  O  O45  1  0.541  0.029  0.179  1.0
[/CIF]
.