The material described by KY2F7 crystallizes in the monoclinic C2/m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to one F(3), one F(4), one F(5), one F(8), two equivalent F(9), and four equivalent F(2) atoms. In the second K site, K(2) is bonded in a 5-coordinate geometry to one F(10), one F(4), one F(5), two equivalent F(1), and two equivalent F(9) atoms. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to two equivalent F(1), two equivalent F(2), two equivalent F(5), and two equivalent F(8) atoms. In the second Y site, Y(2) is bonded in a 8-coordinate geometry to one F(10), one F(8), two equivalent F(1), two equivalent F(6), and two equivalent F(9) atoms. In the third Y site, Y(3) is bonded in a 8-coordinate geometry to one F(1), one F(10), one F(2), one F(3), one F(4), one F(6), one F(7), and one F(9) atom. There are ten inequivalent F sites. In the first F site, F(7) is bonded in a distorted bent 150 degrees geometry to two equivalent Y(3) atoms. In the second F site, F(8) is bonded to one K(1), one Y(2), and two equivalent Y(1) atoms to form distorted FKY3 tetrahedra that share  a cornercorner with one F(4)K2Y2 tetrahedra,  a cornercorner with one F(10)KY3 tetrahedra, corners with two equivalent F(1)KY3 tetrahedra, corners with four equivalent F(2)K2Y2 tetrahedra, corners with five equivalent F(5)K2Y2 tetrahedra,  an edgeedge with one F(8)KY3 tetrahedra, edges with two equivalent F(2)K2Y2 tetrahedra, and edges with two equivalent F(1)KY3 tetrahedra. In the third F site, F(9) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Y(2), and one Y(3) atom. In the fourth F site, F(10) is bonded to one K(2), one Y(2), and two equivalent Y(3) atoms to form FKY3 tetrahedra that share  a cornercorner with one F(4)K2Y2 tetrahedra,  a cornercorner with one F(5)K2Y2 tetrahedra,  a cornercorner with one F(8)KY3 tetrahedra, corners with two equivalent F(2)K2Y2 tetrahedra, corners with two equivalent F(1)KY3 tetrahedra,  an edgeedge with one F(4)K2Y2 tetrahedra, and edges with two equivalent F(1)KY3 tetrahedra. In the fifth F site, F(1) is bonded to one K(2), one Y(1), one Y(2), and one Y(3) atom to form FKY3 tetrahedra that share  a cornercorner with one F(2)K2Y2 tetrahedra,  a cornercorner with one F(5)K2Y2 tetrahedra,  a cornercorner with one F(10)KY3 tetrahedra,  a cornercorner with one F(8)KY3 tetrahedra, corners with two equivalent F(4)K2Y2 tetrahedra, corners with three equivalent F(1)KY3 tetrahedra,  an edgeedge with one F(2)K2Y2 tetrahedra,  an edgeedge with one F(5)K2Y2 tetrahedra,  an edgeedge with one F(10)KY3 tetrahedra, and  an edgeedge with one F(8)KY3 tetrahedra. In the sixth F site, F(2) is bonded to two equivalent K(1), one Y(1), and one Y(3) atom to form FK2Y2 tetrahedra that share  a cornercorner with one F(4)K2Y2 tetrahedra,  a cornercorner with one F(1)KY3 tetrahedra,  a cornercorner with one F(10)KY3 tetrahedra, corners with two equivalent F(5)K2Y2 tetrahedra, corners with two equivalent F(8)KY3 tetrahedra, corners with five equivalent F(2)K2Y2 tetrahedra,  an edgeedge with one F(2)K2Y2 tetrahedra,  an edgeedge with one F(4)K2Y2 tetrahedra,  an edgeedge with one F(5)K2Y2 tetrahedra,  an edgeedge with one F(1)KY3 tetrahedra, and  an edgeedge with one F(8)KY3 tetrahedra. In the seventh F site, F(3) is bonded in a distorted bent 150 degrees geometry to one K(1) and two equivalent Y(3) atoms. In the eighth F site, F(4) is bonded to one K(1), one K(2), and two equivalent Y(3) atoms to form FK2Y2 tetrahedra that share  a cornercorner with one F(10)KY3 tetrahedra,  a cornercorner with one F(8)KY3 tetrahedra, corners with two equivalent F(2)K2Y2 tetrahedra, corners with four equivalent F(1)KY3 tetrahedra,  an edgeedge with one F(5)K2Y2 tetrahedra,  an edgeedge with one F(10)KY3 tetrahedra, and edges with two equivalent F(2)K2Y2 tetrahedra. In the ninth F site, F(5) is bonded to one K(1), one K(2), and two equivalent Y(1) atoms to form FK2Y2 tetrahedra that share  a cornercorner with one F(10)KY3 tetrahedra, corners with two equivalent F(1)KY3 tetrahedra, corners with four equivalent F(2)K2Y2 tetrahedra, corners with five equivalent F(8)KY3 tetrahedra,  an edgeedge with one F(4)K2Y2 tetrahedra,  an edgeedge with one F(5)K2Y2 tetrahedra, edges with two equivalent F(2)K2Y2 tetrahedra, and edges with two equivalent F(1)KY3 tetrahedra. In the tenth F site, F(6) is bonded in a distorted bent 150 degrees geometry to one Y(2) and one Y(3) atom. is represented by the CIF file [CIF]
data_KY2F7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.186
_cell_length_b   8.186
_cell_length_c   11.944
_cell_angle_alpha   59.659
_cell_angle_beta   59.659
_cell_angle_gamma   58.512
_symmetry_Int_Tables_number   1
_cell_volume   556.418
_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  0.263  0.263  0.979  1.0
  K  K1  1  0.767  0.767  0.653  1.0
  K  K2  1  0.233  0.233  0.347  1.0
  K  K3  1  0.737  0.737  0.021  1.0
  Y  Y4  1  0.741  0.259  0.000  1.0
  Y  Y5  1  0.259  0.741  0.000  1.0
  Y  Y6  1  0.240  0.240  0.679  1.0
  Y  Y7  1  0.760  0.760  0.321  1.0
  Y  Y8  1  0.765  0.239  0.318  1.0
  Y  Y9  1  0.239  0.765  0.318  1.0
  Y  Y10  1  0.761  0.235  0.682  1.0
  Y  Y11  1  0.235  0.761  0.682  1.0
  F  F12  1  0.881  0.354  0.763  1.0
  F  F13  1  0.354  0.881  0.763  1.0
  F  F14  1  0.869  0.337  0.083  1.0
  F  F15  1  0.337  0.869  0.083  1.0
  F  F16  1  0.495  0.495  0.736  1.0
  F  F17  1  0.105  0.105  0.248  1.0
  F  F18  1  0.394  0.394  0.074  1.0
  F  F19  1  0.505  0.169  0.501  1.0
  F  F20  1  0.169  0.505  0.501  1.0
  F  F21  1  0.895  0.895  0.752  1.0
  F  F22  1  0.495  0.831  0.499  1.0
  F  F23  1  0.831  0.495  0.499  1.0
  F  F24  1  0.646  0.119  0.237  1.0
  F  F25  1  0.119  0.646  0.237  1.0
  F  F26  1  0.824  0.176  0.500  1.0
  F  F27  1  0.176  0.824  0.500  1.0
  F  F28  1  0.505  0.505  0.264  1.0
  F  F29  1  0.105  0.105  0.913  1.0
  F  F30  1  0.497  0.154  0.741  1.0
  F  F31  1  0.154  0.497  0.741  1.0
  F  F32  1  0.503  0.846  0.259  1.0
  F  F33  1  0.846  0.503  0.259  1.0
  F  F34  1  0.887  0.887  0.382  1.0
  F  F35  1  0.606  0.606  0.926  1.0
  F  F36  1  0.895  0.895  0.087  1.0
  F  F37  1  0.663  0.131  0.917  1.0
  F  F38  1  0.131  0.663  0.917  1.0
  F  F39  1  0.113  0.113  0.618  1.0
[/CIF]
.
The material described by KY2F7 crystallizes in the monoclinic C2/m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to one F(3), one F(4), one F(5), one F(8), two equivalent F(9), and four equivalent F(2) atoms. In the second K site, K(2) is bonded in a 5-coordinate geometry to one F(10), one F(4), one F(5), two equivalent F(1), and two equivalent F(9) atoms. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to two equivalent F(1), two equivalent F(2), two equivalent F(5), and two equivalent F(8) atoms. In the second Y site, Y(2) is bonded in a 8-coordinate geometry to one F(10), one F(8), two equivalent F(1), two equivalent F(6), and two equivalent F(9) atoms. In the third Y site, Y(3) is bonded in a 8-coordinate geometry to one F(1), one F(10), one F(2), one F(3), one F(4), one F(6), one F(7), and one F(9) atom. There are ten inequivalent F sites. In the first F site, F(7) is bonded in a distorted bent 150 degrees geometry to two equivalent Y(3) atoms. In the second F site, F(8) is bonded to one K(1), one Y(2), and two equivalent Y(1) atoms to form distorted FKY3 tetrahedra that share  a cornercorner with one F(4)K2Y2 tetrahedra,  a cornercorner with one F(10)KY3 tetrahedra, corners with two equivalent F(1)KY3 tetrahedra, corners with four equivalent F(2)K2Y2 tetrahedra, corners with five equivalent F(5)K2Y2 tetrahedra,  an edgeedge with one F(8)KY3 tetrahedra, edges with two equivalent F(2)K2Y2 tetrahedra, and edges with two equivalent F(1)KY3 tetrahedra. In the third F site, F(9) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Y(2), and one Y(3) atom. In the fourth F site, F(10) is bonded to one K(2), one Y(2), and two equivalent Y(3) atoms to form FKY3 tetrahedra that share  a cornercorner with one F(4)K2Y2 tetrahedra,  a cornercorner with one F(5)K2Y2 tetrahedra,  a cornercorner with one F(8)KY3 tetrahedra, corners with two equivalent F(2)K2Y2 tetrahedra, corners with two equivalent F(1)KY3 tetrahedra,  an edgeedge with one F(4)K2Y2 tetrahedra, and edges with two equivalent F(1)KY3 tetrahedra. In the fifth F site, F(1) is bonded to one K(2), one Y(1), one Y(2), and one Y(3) atom to form FKY3 tetrahedra that share  a cornercorner with one F(2)K2Y2 tetrahedra,  a cornercorner with one F(5)K2Y2 tetrahedra,  a cornercorner with one F(10)KY3 tetrahedra,  a cornercorner with one F(8)KY3 tetrahedra, corners with two equivalent F(4)K2Y2 tetrahedra, corners with three equivalent F(1)KY3 tetrahedra,  an edgeedge with one F(2)K2Y2 tetrahedra,  an edgeedge with one F(5)K2Y2 tetrahedra,  an edgeedge with one F(10)KY3 tetrahedra, and  an edgeedge with one F(8)KY3 tetrahedra. In the sixth F site, F(2) is bonded to two equivalent K(1), one Y(1), and one Y(3) atom to form FK2Y2 tetrahedra that share  a cornercorner with one F(4)K2Y2 tetrahedra,  a cornercorner with one F(1)KY3 tetrahedra,  a cornercorner with one F(10)KY3 tetrahedra, corners with two equivalent F(5)K2Y2 tetrahedra, corners with two equivalent F(8)KY3 tetrahedra, corners with five equivalent F(2)K2Y2 tetrahedra,  an edgeedge with one F(2)K2Y2 tetrahedra,  an edgeedge with one F(4)K2Y2 tetrahedra,  an edgeedge with one F(5)K2Y2 tetrahedra,  an edgeedge with one F(1)KY3 tetrahedra, and  an edgeedge with one F(8)KY3 tetrahedra. In the seventh F site, F(3) is bonded in a distorted bent 150 degrees geometry to one K(1) and two equivalent Y(3) atoms. In the eighth F site, F(4) is bonded to one K(1), one K(2), and two equivalent Y(3) atoms to form FK2Y2 tetrahedra that share  a cornercorner with one F(10)KY3 tetrahedra,  a cornercorner with one F(8)KY3 tetrahedra, corners with two equivalent F(2)K2Y2 tetrahedra, corners with four equivalent F(1)KY3 tetrahedra,  an edgeedge with one F(5)K2Y2 tetrahedra,  an edgeedge with one F(10)KY3 tetrahedra, and edges with two equivalent F(2)K2Y2 tetrahedra. In the ninth F site, F(5) is bonded to one K(1), one K(2), and two equivalent Y(1) atoms to form FK2Y2 tetrahedra that share  a cornercorner with one F(10)KY3 tetrahedra, corners with two equivalent F(1)KY3 tetrahedra, corners with four equivalent F(2)K2Y2 tetrahedra, corners with five equivalent F(8)KY3 tetrahedra,  an edgeedge with one F(4)K2Y2 tetrahedra,  an edgeedge with one F(5)K2Y2 tetrahedra, edges with two equivalent F(2)K2Y2 tetrahedra, and edges with two equivalent F(1)KY3 tetrahedra. In the tenth F site, F(6) is bonded in a distorted bent 150 degrees geometry to one Y(2) and one Y(3) atom. is represented by the CIF file [CIF]
data_KY2F7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.186
_cell_length_b   8.186
_cell_length_c   11.944
_cell_angle_alpha   59.659
_cell_angle_beta   59.659
_cell_angle_gamma   58.512
_symmetry_Int_Tables_number   1
_cell_volume   556.418
_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  0.263  0.263  0.979  1.0
  K  K1  1  0.767  0.767  0.653  1.0
  K  K2  1  0.233  0.233  0.347  1.0
  K  K3  1  0.737  0.737  0.021  1.0
  Y  Y4  1  0.741  0.259  0.000  1.0
  Y  Y5  1  0.259  0.741  0.000  1.0
  Y  Y6  1  0.240  0.240  0.679  1.0
  Y  Y7  1  0.760  0.760  0.321  1.0
  Y  Y8  1  0.765  0.239  0.318  1.0
  Y  Y9  1  0.239  0.765  0.318  1.0
  Y  Y10  1  0.761  0.235  0.682  1.0
  Y  Y11  1  0.235  0.761  0.682  1.0
  F  F12  1  0.881  0.354  0.763  1.0
  F  F13  1  0.354  0.881  0.763  1.0
  F  F14  1  0.869  0.337  0.083  1.0
  F  F15  1  0.337  0.869  0.083  1.0
  F  F16  1  0.495  0.495  0.736  1.0
  F  F17  1  0.105  0.105  0.248  1.0
  F  F18  1  0.394  0.394  0.074  1.0
  F  F19  1  0.505  0.169  0.501  1.0
  F  F20  1  0.169  0.505  0.501  1.0
  F  F21  1  0.895  0.895  0.752  1.0
  F  F22  1  0.495  0.831  0.499  1.0
  F  F23  1  0.831  0.495  0.499  1.0
  F  F24  1  0.646  0.119  0.237  1.0
  F  F25  1  0.119  0.646  0.237  1.0
  F  F26  1  0.824  0.176  0.500  1.0
  F  F27  1  0.176  0.824  0.500  1.0
  F  F28  1  0.505  0.505  0.264  1.0
  F  F29  1  0.105  0.105  0.913  1.0
  F  F30  1  0.497  0.154  0.741  1.0
  F  F31  1  0.154  0.497  0.741  1.0
  F  F32  1  0.503  0.846  0.259  1.0
  F  F33  1  0.846  0.503  0.259  1.0
  F  F34  1  0.887  0.887  0.382  1.0
  F  F35  1  0.606  0.606  0.926  1.0
  F  F36  1  0.895  0.895  0.087  1.0
  F  F37  1  0.663  0.131  0.917  1.0
  F  F38  1  0.131  0.663  0.917  1.0
  F  F39  1  0.113  0.113  0.618  1.0
[/CIF]
.