The crystal structure described by KV3Ge2O9 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 6-coordinate geometry to two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. There are two inequivalent V sites. In the first V site, V(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form VO6 octahedra that share corners with four equivalent Ge(1)O4 tetrahedra and edges with four equivalent V(2,3)O6 octahedra. In the second V site, V(2,3) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form VO6 octahedra that share corners with four equivalent Ge(1)O4 tetrahedra; edges with two equivalent V(1)O6 octahedra; and edges with two equivalent V(2,3)O6 octahedra. Ge(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form GeO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra; corners with four equivalent V(2,3)O6 octahedra; and  a cornercorner with one Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-56°. There are five inequivalent O sites. In the first O site, O(5) is bonded in a 4-coordinate geometry to one K(1); one V(1); one V(2,3); and one Ge(1) atom. In the second O site, O(1) is bonded in a linear geometry to two equivalent Ge(1) atoms. In the third O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one V(1) and two equivalent V(2,3) atoms. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to one K(1); two equivalent V(2,3); and one Ge(1) atom. In the fifth O site, O(4) is bonded in a 4-coordinate geometry to one K(1); one V(1); one V(2,3); and one Ge(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_KV3Ge2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.987
_cell_length_b   5.986
_cell_length_c   13.811
_cell_angle_alpha   90.082
_cell_angle_beta   89.847
_cell_angle_gamma   119.999
_symmetry_Int_Tables_number   1
_cell_volume   428.655
_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  0.333  0.667  0.750  1.0
  K  K1  1  0.667  0.333  0.250  1.0
  V  V2  1  0.500  0.500  0.500  1.0
  V  V3  1  0.500  0.000  0.000  1.0
  V  V4  1  0.500  0.500  0.000  1.0
  V  V5  1  0.000  0.500  0.500  1.0
  V  V6  1  0.500  0.000  0.500  1.0
  V  V7  1  1.000  0.500  1.000  1.0
  Ge  Ge8  1  1.000  1.000  0.623  1.0
  Ge  Ge9  1  0.000  0.000  0.377  1.0
  Ge  Ge10  1  1.000  0.000  0.122  1.0
  Ge  Ge11  1  0.000  1.000  0.878  1.0
  O  O12  1  1.000  1.000  0.750  1.0
  O  O13  1  0.000  0.000  0.250  1.0
  O  O14  1  0.667  0.332  0.568  1.0
  O  O15  1  0.333  0.668  0.432  1.0
  O  O16  1  0.335  0.668  0.068  1.0
  O  O17  1  0.665  0.332  0.932  1.0
  O  O18  1  0.165  0.834  0.586  1.0
  O  O19  1  0.670  0.834  0.586  1.0
  O  O20  1  0.166  0.330  0.586  1.0
  O  O21  1  0.835  0.166  0.414  1.0
  O  O22  1  0.330  0.166  0.414  1.0
  O  O23  1  0.834  0.670  0.414  1.0
  O  O24  1  0.836  0.166  0.086  1.0
  O  O25  1  0.331  0.166  0.086  1.0
  O  O26  1  0.836  0.670  0.086  1.0
  O  O27  1  0.164  0.834  0.914  1.0
  O  O28  1  0.669  0.834  0.914  1.0
  O  O29  1  0.164  0.330  0.914  1.0
[/CIF]
.
The crystal structure described by KV3Ge2O9 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 6-coordinate geometry to two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. There are two inequivalent V sites. In the first V site, V(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form VO6 octahedra that share corners with four equivalent Ge(1)O4 tetrahedra and edges with four equivalent V(2,3)O6 octahedra. In the second V site, V(2,3) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form VO6 octahedra that share corners with four equivalent Ge(1)O4 tetrahedra; edges with two equivalent V(1)O6 octahedra; and edges with two equivalent V(2,3)O6 octahedra. Ge(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form GeO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra; corners with four equivalent V(2,3)O6 octahedra; and  a cornercorner with one Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-56°. There are five inequivalent O sites. In the first O site, O(5) is bonded in a 4-coordinate geometry to one K(1); one V(1); one V(2,3); and one Ge(1) atom. In the second O site, O(1) is bonded in a linear geometry to two equivalent Ge(1) atoms. In the third O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one V(1) and two equivalent V(2,3) atoms. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to one K(1); two equivalent V(2,3); and one Ge(1) atom. In the fifth O site, O(4) is bonded in a 4-coordinate geometry to one K(1); one V(1); one V(2,3); and one Ge(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_KV3Ge2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.987
_cell_length_b   5.986
_cell_length_c   13.811
_cell_angle_alpha   90.082
_cell_angle_beta   89.847
_cell_angle_gamma   119.999
_symmetry_Int_Tables_number   1
_cell_volume   428.655
_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  0.333  0.667  0.750  1.0
  K  K1  1  0.667  0.333  0.250  1.0
  V  V2  1  0.500  0.500  0.500  1.0
  V  V3  1  0.500  0.000  0.000  1.0
  V  V4  1  0.500  0.500  0.000  1.0
  V  V5  1  0.000  0.500  0.500  1.0
  V  V6  1  0.500  0.000  0.500  1.0
  V  V7  1  1.000  0.500  1.000  1.0
  Ge  Ge8  1  1.000  1.000  0.623  1.0
  Ge  Ge9  1  0.000  0.000  0.377  1.0
  Ge  Ge10  1  1.000  0.000  0.122  1.0
  Ge  Ge11  1  0.000  1.000  0.878  1.0
  O  O12  1  1.000  1.000  0.750  1.0
  O  O13  1  0.000  0.000  0.250  1.0
  O  O14  1  0.667  0.332  0.568  1.0
  O  O15  1  0.333  0.668  0.432  1.0
  O  O16  1  0.335  0.668  0.068  1.0
  O  O17  1  0.665  0.332  0.932  1.0
  O  O18  1  0.165  0.834  0.586  1.0
  O  O19  1  0.670  0.834  0.586  1.0
  O  O20  1  0.166  0.330  0.586  1.0
  O  O21  1  0.835  0.166  0.414  1.0
  O  O22  1  0.330  0.166  0.414  1.0
  O  O23  1  0.834  0.670  0.414  1.0
  O  O24  1  0.836  0.166  0.086  1.0
  O  O25  1  0.331  0.166  0.086  1.0
  O  O26  1  0.836  0.670  0.086  1.0
  O  O27  1  0.164  0.834  0.914  1.0
  O  O28  1  0.669  0.834  0.914  1.0
  O  O29  1  0.164  0.330  0.914  1.0
[/CIF]
.