The crystal structure described by KSb2PO8 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(8), two equivalent O(6), and two equivalent O(7) atoms. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(7) atoms to form SbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and corners with two equivalent P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-51°. In the second Sb site, Sb(2) is bonded to one O(1), one O(2), one O(4), one O(8), and two equivalent O(6) atoms to form SbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, and  an edgeedge with one Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-51°. P(1) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Sb(1)O6 octahedra and corners with two equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-53°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Sb(2) and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one K(1), one Sb(1), and one Sb(2) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(1), one Sb(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one K(1), one Sb(1), and one Sb(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one Sb(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to two equivalent K(1) and two equivalent Sb(2) atoms. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to two equivalent K(1) and two equivalent Sb(1) atoms. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one K(1), one Sb(2), and one P(1) atom. is represented by the CIF card [CIF]
data_KSb2PO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.106
_cell_length_b   7.106
_cell_length_c   15.057
_cell_angle_alpha   84.972
_cell_angle_beta   84.972
_cell_angle_gamma   60.025
_symmetry_Int_Tables_number   1
_cell_volume   655.172
_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
  K  K0  1  0.148  0.907  0.116  1.0
  K  K1  1  0.907  0.148  0.616  1.0
  K  K2  1  0.852  0.093  0.884  1.0
  K  K3  1  0.093  0.852  0.384  1.0
  Sb  Sb4  1  0.621  0.875  0.247  1.0
  Sb  Sb5  1  0.192  0.455  0.937  1.0
  Sb  Sb6  1  0.455  0.192  0.437  1.0
  Sb  Sb7  1  0.379  0.125  0.753  1.0
  Sb  Sb8  1  0.808  0.545  0.063  1.0
  Sb  Sb9  1  0.875  0.621  0.747  1.0
  Sb  Sb10  1  0.125  0.379  0.253  1.0
  Sb  Sb11  1  0.545  0.808  0.563  1.0
  P  P12  1  0.715  0.488  0.394  1.0
  P  P13  1  0.512  0.285  0.106  1.0
  P  P14  1  0.488  0.715  0.894  1.0
  P  P15  1  0.285  0.512  0.606  1.0
  O  O16  1  0.402  0.246  0.032  1.0
  O  O17  1  0.257  0.413  0.355  1.0
  O  O18  1  0.673  0.071  0.153  1.0
  O  O19  1  0.327  0.929  0.847  1.0
  O  O20  1  0.981  0.341  0.158  1.0
  O  O21  1  0.562  0.661  0.327  1.0
  O  O22  1  0.999  0.334  0.971  1.0
  O  O23  1  0.661  0.562  0.827  1.0
  O  O24  1  0.438  0.339  0.673  1.0
  O  O25  1  0.246  0.402  0.532  1.0
  O  O26  1  0.929  0.327  0.347  1.0
  O  O27  1  0.062  0.306  0.753  1.0
  O  O28  1  0.019  0.659  0.842  1.0
  O  O29  1  0.339  0.438  0.173  1.0
  O  O30  1  0.001  0.666  0.029  1.0
  O  O31  1  0.306  0.062  0.253  1.0
  O  O32  1  0.382  0.647  0.562  1.0
  O  O33  1  0.666  0.001  0.529  1.0
  O  O34  1  0.334  0.999  0.471  1.0
  O  O35  1  0.353  0.618  0.938  1.0
  O  O36  1  0.694  0.938  0.747  1.0
  O  O37  1  0.659  0.019  0.342  1.0
  O  O38  1  0.743  0.587  0.645  1.0
  O  O39  1  0.647  0.382  0.062  1.0
  O  O40  1  0.598  0.754  0.968  1.0
  O  O41  1  0.341  0.981  0.658  1.0
  O  O42  1  0.754  0.598  0.468  1.0
  O  O43  1  0.618  0.353  0.438  1.0
  O  O44  1  0.587  0.743  0.145  1.0
  O  O45  1  0.071  0.673  0.653  1.0
  O  O46  1  0.938  0.694  0.247  1.0
  O  O47  1  0.413  0.257  0.855  1.0
[/CIF]
.
The crystal structure described by KSb2PO8 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(8), two equivalent O(6), and two equivalent O(7) atoms. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(7) atoms to form SbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent Sb(2)O6 octahedra, and corners with two equivalent P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-51°. In the second Sb site, Sb(2) is bonded to one O(1), one O(2), one O(4), one O(8), and two equivalent O(6) atoms to form SbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, and  an edgeedge with one Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-51°. P(1) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Sb(1)O6 octahedra and corners with two equivalent Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-53°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Sb(2) and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one K(1), one Sb(1), and one Sb(2) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(1), one Sb(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one K(1), one Sb(1), and one Sb(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one Sb(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to two equivalent K(1) and two equivalent Sb(2) atoms. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to two equivalent K(1) and two equivalent Sb(1) atoms. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one K(1), one Sb(2), and one P(1) atom. is represented by the CIF card [CIF]
data_KSb2PO8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.106
_cell_length_b   7.106
_cell_length_c   15.057
_cell_angle_alpha   84.972
_cell_angle_beta   84.972
_cell_angle_gamma   60.025
_symmetry_Int_Tables_number   1
_cell_volume   655.172
_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
  K  K0  1  0.148  0.907  0.116  1.0
  K  K1  1  0.907  0.148  0.616  1.0
  K  K2  1  0.852  0.093  0.884  1.0
  K  K3  1  0.093  0.852  0.384  1.0
  Sb  Sb4  1  0.621  0.875  0.247  1.0
  Sb  Sb5  1  0.192  0.455  0.937  1.0
  Sb  Sb6  1  0.455  0.192  0.437  1.0
  Sb  Sb7  1  0.379  0.125  0.753  1.0
  Sb  Sb8  1  0.808  0.545  0.063  1.0
  Sb  Sb9  1  0.875  0.621  0.747  1.0
  Sb  Sb10  1  0.125  0.379  0.253  1.0
  Sb  Sb11  1  0.545  0.808  0.563  1.0
  P  P12  1  0.715  0.488  0.394  1.0
  P  P13  1  0.512  0.285  0.106  1.0
  P  P14  1  0.488  0.715  0.894  1.0
  P  P15  1  0.285  0.512  0.606  1.0
  O  O16  1  0.402  0.246  0.032  1.0
  O  O17  1  0.257  0.413  0.355  1.0
  O  O18  1  0.673  0.071  0.153  1.0
  O  O19  1  0.327  0.929  0.847  1.0
  O  O20  1  0.981  0.341  0.158  1.0
  O  O21  1  0.562  0.661  0.327  1.0
  O  O22  1  0.999  0.334  0.971  1.0
  O  O23  1  0.661  0.562  0.827  1.0
  O  O24  1  0.438  0.339  0.673  1.0
  O  O25  1  0.246  0.402  0.532  1.0
  O  O26  1  0.929  0.327  0.347  1.0
  O  O27  1  0.062  0.306  0.753  1.0
  O  O28  1  0.019  0.659  0.842  1.0
  O  O29  1  0.339  0.438  0.173  1.0
  O  O30  1  0.001  0.666  0.029  1.0
  O  O31  1  0.306  0.062  0.253  1.0
  O  O32  1  0.382  0.647  0.562  1.0
  O  O33  1  0.666  0.001  0.529  1.0
  O  O34  1  0.334  0.999  0.471  1.0
  O  O35  1  0.353  0.618  0.938  1.0
  O  O36  1  0.694  0.938  0.747  1.0
  O  O37  1  0.659  0.019  0.342  1.0
  O  O38  1  0.743  0.587  0.645  1.0
  O  O39  1  0.647  0.382  0.062  1.0
  O  O40  1  0.598  0.754  0.968  1.0
  O  O41  1  0.341  0.981  0.658  1.0
  O  O42  1  0.754  0.598  0.468  1.0
  O  O43  1  0.618  0.353  0.438  1.0
  O  O44  1  0.587  0.743  0.145  1.0
  O  O45  1  0.071  0.673  0.653  1.0
  O  O46  1  0.938  0.694  0.247  1.0
  O  O47  1  0.413  0.257  0.855  1.0
[/CIF]
.