The material described by KZn2(PO4)2 crystallizes in the triclinic P-1 space group. K(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom to form distorted KO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent Zn(1)O4 tetrahedra, corners with three equivalent Zn(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(5), one O(7), and one O(8) atom to form ZnO4 tetrahedra that share corners with two equivalent K(1)O6 octahedra,  a cornercorner with one Zn(2)O4 tetrahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 58-72°. In the second Zn site, Zn(2) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form ZnO4 tetrahedra that share corners with three equivalent K(1)O6 octahedra,  a cornercorner with one Zn(1)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 63-67°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent K(1)O6 octahedra,  a cornercorner with one Zn(1)O4 tetrahedra, and corners with two equivalent Zn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-65°. In the second P site, P(2) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one K(1)O6 octahedra, corners with two equivalent Zn(2)O4 tetrahedra, corners with three equivalent Zn(1)O4 tetrahedra, and  an edgeedge with one K(1)O6 octahedra. The corner-sharing octahedral tilt angles are 70°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Zn(1), one Zn(2), and one P(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one K(1), one Zn(2), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Zn(2), and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one Zn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one K(1), one Zn(2), and one P(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one K(1), one Zn(1), and one P(2) atom. is represented by the CIF file [CIF]
data_KZn2(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.252
_cell_length_b   9.019
_cell_length_c   9.598
_cell_angle_alpha   97.335
_cell_angle_beta   101.567
_cell_angle_gamma   106.837
_symmetry_Int_Tables_number   1
_cell_volume   417.822
_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
  K  K0  1  0.412  0.706  0.678  1.0
  K  K1  1  0.588  0.294  0.322  1.0
  Zn  Zn2  1  0.690  0.891  0.112  1.0
  Zn  Zn3  1  0.310  0.109  0.888  1.0
  Zn  Zn4  1  0.220  0.615  0.235  1.0
  Zn  Zn5  1  0.780  0.385  0.765  1.0
  P  P6  1  0.154  0.250  0.602  1.0
  P  P7  1  0.846  0.750  0.398  1.0
  P  P8  1  0.912  0.245  0.052  1.0
  P  P9  1  0.088  0.755  0.948  1.0
  O  O10  1  0.287  0.762  0.099  1.0
  O  O11  1  0.713  0.238  0.901  1.0
  O  O12  1  0.900  0.305  0.599  1.0
  O  O13  1  0.100  0.695  0.401  1.0
  O  O14  1  0.969  0.404  0.154  1.0
  O  O15  1  0.031  0.596  0.846  1.0
  O  O16  1  0.167  0.198  0.444  1.0
  O  O17  1  0.833  0.802  0.556  1.0
  O  O18  1  0.182  0.222  0.031  1.0
  O  O19  1  0.818  0.778  0.969  1.0
  O  O20  1  0.582  0.603  0.333  1.0
  O  O21  1  0.418  0.397  0.667  1.0
  O  O22  1  0.848  0.883  0.313  1.0
  O  O23  1  0.152  0.117  0.687  1.0
  O  O24  1  0.738  0.114  0.116  1.0
  O  O25  1  0.262  0.886  0.884  1.0
[/CIF]
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The material described by KZn2(PO4)2 crystallizes in the triclinic P-1 space group. K(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom to form distorted KO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent Zn(1)O4 tetrahedra, corners with three equivalent Zn(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(5), one O(7), and one O(8) atom to form ZnO4 tetrahedra that share corners with two equivalent K(1)O6 octahedra,  a cornercorner with one Zn(2)O4 tetrahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 58-72°. In the second Zn site, Zn(2) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form ZnO4 tetrahedra that share corners with three equivalent K(1)O6 octahedra,  a cornercorner with one Zn(1)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 63-67°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent K(1)O6 octahedra,  a cornercorner with one Zn(1)O4 tetrahedra, and corners with two equivalent Zn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-65°. In the second P site, P(2) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one K(1)O6 octahedra, corners with two equivalent Zn(2)O4 tetrahedra, corners with three equivalent Zn(1)O4 tetrahedra, and  an edgeedge with one K(1)O6 octahedra. The corner-sharing octahedral tilt angles are 70°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Zn(1), one Zn(2), and one P(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one K(1), one Zn(2), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Zn(2), and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one Zn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one K(1), one Zn(2), and one P(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one K(1), one Zn(1), and one P(2) atom. is represented by the CIF file [CIF]
data_KZn2(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.252
_cell_length_b   9.019
_cell_length_c   9.598
_cell_angle_alpha   97.335
_cell_angle_beta   101.567
_cell_angle_gamma   106.837
_symmetry_Int_Tables_number   1
_cell_volume   417.822
_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
  K  K0  1  0.412  0.706  0.678  1.0
  K  K1  1  0.588  0.294  0.322  1.0
  Zn  Zn2  1  0.690  0.891  0.112  1.0
  Zn  Zn3  1  0.310  0.109  0.888  1.0
  Zn  Zn4  1  0.220  0.615  0.235  1.0
  Zn  Zn5  1  0.780  0.385  0.765  1.0
  P  P6  1  0.154  0.250  0.602  1.0
  P  P7  1  0.846  0.750  0.398  1.0
  P  P8  1  0.912  0.245  0.052  1.0
  P  P9  1  0.088  0.755  0.948  1.0
  O  O10  1  0.287  0.762  0.099  1.0
  O  O11  1  0.713  0.238  0.901  1.0
  O  O12  1  0.900  0.305  0.599  1.0
  O  O13  1  0.100  0.695  0.401  1.0
  O  O14  1  0.969  0.404  0.154  1.0
  O  O15  1  0.031  0.596  0.846  1.0
  O  O16  1  0.167  0.198  0.444  1.0
  O  O17  1  0.833  0.802  0.556  1.0
  O  O18  1  0.182  0.222  0.031  1.0
  O  O19  1  0.818  0.778  0.969  1.0
  O  O20  1  0.582  0.603  0.333  1.0
  O  O21  1  0.418  0.397  0.667  1.0
  O  O22  1  0.848  0.883  0.313  1.0
  O  O23  1  0.152  0.117  0.687  1.0
  O  O24  1  0.738  0.114  0.116  1.0
  O  O25  1  0.262  0.886  0.884  1.0
[/CIF]
.