The material structure described by K6Ba2CaU6O24 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to two equivalent O(3), two equivalent O(6), four equivalent O(1), and four equivalent O(4) atoms to form KO12 cuboctahedra that share corners with two equivalent K(1)O12 cuboctahedra, corners with two equivalent Ba(1)O12 cuboctahedra, corners with eight equivalent K(2)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with four equivalent K(2)O12 cuboctahedra, faces with two equivalent Ca(1)O6 octahedra, faces with two equivalent U(3)O6 octahedra, and faces with four equivalent U(1)O6 octahedra. In the second K site, K(2) is bonded to one O(6), one O(7), two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form KO12 cuboctahedra that share corners with four equivalent K(1)O12 cuboctahedra, corners with four equivalent K(2)O12 cuboctahedra, corners with four equivalent Ba(1)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, faces with two equivalent Ba(1)O12 cuboctahedra,  a faceface with one Ca(1)O6 octahedra,  a faceface with one U(2)O6 octahedra,  a faceface with one U(3)O6 octahedra, and faces with four equivalent U(1)O6 octahedra. Ba(1) is bonded to two equivalent O(3), two equivalent O(7), four equivalent O(2), and four equivalent O(5) atoms to form BaO12 cuboctahedra that share corners with two equivalent K(1)O12 cuboctahedra, corners with two equivalent Ba(1)O12 cuboctahedra, corners with eight equivalent K(2)O12 cuboctahedra, faces with two equivalent Ba(1)O12 cuboctahedra, faces with four equivalent K(2)O12 cuboctahedra, faces with two equivalent U(2)O6 octahedra, and faces with four equivalent U(1)O6 octahedra. Ca(1) is bonded to two equivalent O(6) and four equivalent O(4) atoms to form CaO6 octahedra that share corners with two equivalent U(3)O6 octahedra, corners with four equivalent U(1)O6 octahedra, faces with four equivalent K(1)O12 cuboctahedra, and faces with four equivalent K(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are three inequivalent U sites. In the first U site, U(1) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(3) atoms to form UO6 octahedra that share  a cornercorner with one Ca(1)O6 octahedra,  a cornercorner with one U(2)O6 octahedra,  a cornercorner with one U(3)O6 octahedra, corners with two equivalent U(1)O6 octahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent Ba(1)O12 cuboctahedra, and faces with four equivalent K(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-6°. In the second U site, U(2) is bonded to two equivalent O(7) and four equivalent O(2) atoms to form UO6 octahedra that share corners with four equivalent U(1)O6 octahedra, faces with four equivalent K(2)O12 cuboctahedra, and faces with four equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 6°. In the third U site, U(3) is bonded to two equivalent O(6) and four equivalent O(1) atoms to form UO6 octahedra that share corners with two equivalent Ca(1)O6 octahedra, corners with four equivalent U(1)O6 octahedra, faces with four equivalent K(1)O12 cuboctahedra, and faces with four equivalent K(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are seven inequivalent O sites. In the first O site, O(3) is bonded in a distorted linear geometry to one K(1), two equivalent K(2), one Ba(1), and two equivalent U(1) atoms. In the second O site, O(4) is bonded in a distorted linear geometry to two equivalent K(1), two equivalent K(2), one Ca(1), and one U(1) atom. In the third O site, O(5) is bonded in a distorted single-bond geometry to two equivalent K(2), two equivalent Ba(1), and one U(1) atom. In the fourth O site, O(6) is bonded in a distorted linear geometry to two equivalent K(1), two equivalent K(2), one Ca(1), and one U(3) atom. In the fifth O site, O(7) is bonded in a distorted single-bond geometry to two equivalent K(2), two equivalent Ba(1), and one U(2) atom. In the sixth O site, O(1) is bonded in a distorted linear geometry to two equivalent K(1), two equivalent K(2), one U(1), and one U(3) atom. In the seventh O site, O(2) is bonded in a distorted linear geometry to two equivalent K(2), two equivalent Ba(1), one U(1), and one U(2) atom. is represented by the CIF file [CIF]
data_K6Ba2CaU6O24
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.600
_cell_length_b   7.600
_cell_length_c   12.304
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   109.963
_symmetry_Int_Tables_number   1
_cell_volume   667.964
_cell_formula_units_Z   1
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  0.500  0.000  0.000  1.0
  K  K1  1  0.000  0.500  0.000  1.0
  K  K2  1  0.735  0.735  0.258  1.0
  K  K3  1  0.265  0.265  0.742  1.0
  K  K4  1  0.265  0.265  0.258  1.0
  K  K5  1  0.735  0.735  0.742  1.0
  Ba  Ba6  1  0.000  0.500  0.500  1.0
  Ba  Ba7  1  0.500  0.000  0.500  1.0
  Ca  Ca8  1  0.000  0.000  0.000  1.0
  U  U9  1  0.247  0.753  0.245  1.0
  U  U10  1  0.753  0.247  0.755  1.0
  U  U11  1  0.000  0.000  0.500  1.0
  U  U12  1  0.500  0.500  0.000  1.0
  U  U13  1  0.753  0.247  0.245  1.0
  U  U14  1  0.247  0.753  0.755  1.0
  O  O15  1  0.375  0.625  0.124  1.0
  O  O16  1  0.870  0.130  0.621  1.0
  O  O17  1  0.625  0.375  0.124  1.0
  O  O18  1  0.130  0.870  0.621  1.0
  O  O19  1  0.000  0.500  0.255  1.0
  O  O20  1  0.500  0.000  0.745  1.0
  O  O21  1  0.870  0.130  0.379  1.0
  O  O22  1  0.375  0.625  0.876  1.0
  O  O23  1  0.130  0.870  0.379  1.0
  O  O24  1  0.625  0.375  0.876  1.0
  O  O25  1  0.500  0.000  0.255  1.0
  O  O26  1  0.000  0.500  0.745  1.0
  O  O27  1  0.864  0.136  0.134  1.0
  O  O28  1  0.350  0.650  0.638  1.0
  O  O29  1  0.350  0.650  0.362  1.0
  O  O30  1  0.864  0.136  0.866  1.0
  O  O31  1  0.725  0.725  0.000  1.0
  O  O32  1  0.219  0.219  0.500  1.0
  O  O33  1  0.650  0.350  0.362  1.0
  O  O34  1  0.136  0.864  0.866  1.0
  O  O35  1  0.136  0.864  0.134  1.0
  O  O36  1  0.650  0.350  0.638  1.0
  O  O37  1  0.781  0.781  0.500  1.0
  O  O38  1  0.275  0.275  0.000  1.0
[/CIF]
.
The material structure described by K6Ba2CaU6O24 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to two equivalent O(3), two equivalent O(6), four equivalent O(1), and four equivalent O(4) atoms to form KO12 cuboctahedra that share corners with two equivalent K(1)O12 cuboctahedra, corners with two equivalent Ba(1)O12 cuboctahedra, corners with eight equivalent K(2)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with four equivalent K(2)O12 cuboctahedra, faces with two equivalent Ca(1)O6 octahedra, faces with two equivalent U(3)O6 octahedra, and faces with four equivalent U(1)O6 octahedra. In the second K site, K(2) is bonded to one O(6), one O(7), two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form KO12 cuboctahedra that share corners with four equivalent K(1)O12 cuboctahedra, corners with four equivalent K(2)O12 cuboctahedra, corners with four equivalent Ba(1)O12 cuboctahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent K(2)O12 cuboctahedra, faces with two equivalent Ba(1)O12 cuboctahedra,  a faceface with one Ca(1)O6 octahedra,  a faceface with one U(2)O6 octahedra,  a faceface with one U(3)O6 octahedra, and faces with four equivalent U(1)O6 octahedra. Ba(1) is bonded to two equivalent O(3), two equivalent O(7), four equivalent O(2), and four equivalent O(5) atoms to form BaO12 cuboctahedra that share corners with two equivalent K(1)O12 cuboctahedra, corners with two equivalent Ba(1)O12 cuboctahedra, corners with eight equivalent K(2)O12 cuboctahedra, faces with two equivalent Ba(1)O12 cuboctahedra, faces with four equivalent K(2)O12 cuboctahedra, faces with two equivalent U(2)O6 octahedra, and faces with four equivalent U(1)O6 octahedra. Ca(1) is bonded to two equivalent O(6) and four equivalent O(4) atoms to form CaO6 octahedra that share corners with two equivalent U(3)O6 octahedra, corners with four equivalent U(1)O6 octahedra, faces with four equivalent K(1)O12 cuboctahedra, and faces with four equivalent K(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are three inequivalent U sites. In the first U site, U(1) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(3) atoms to form UO6 octahedra that share  a cornercorner with one Ca(1)O6 octahedra,  a cornercorner with one U(2)O6 octahedra,  a cornercorner with one U(3)O6 octahedra, corners with two equivalent U(1)O6 octahedra, faces with two equivalent K(1)O12 cuboctahedra, faces with two equivalent Ba(1)O12 cuboctahedra, and faces with four equivalent K(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-6°. In the second U site, U(2) is bonded to two equivalent O(7) and four equivalent O(2) atoms to form UO6 octahedra that share corners with four equivalent U(1)O6 octahedra, faces with four equivalent K(2)O12 cuboctahedra, and faces with four equivalent Ba(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 6°. In the third U site, U(3) is bonded to two equivalent O(6) and four equivalent O(1) atoms to form UO6 octahedra that share corners with two equivalent Ca(1)O6 octahedra, corners with four equivalent U(1)O6 octahedra, faces with four equivalent K(1)O12 cuboctahedra, and faces with four equivalent K(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are seven inequivalent O sites. In the first O site, O(3) is bonded in a distorted linear geometry to one K(1), two equivalent K(2), one Ba(1), and two equivalent U(1) atoms. In the second O site, O(4) is bonded in a distorted linear geometry to two equivalent K(1), two equivalent K(2), one Ca(1), and one U(1) atom. In the third O site, O(5) is bonded in a distorted single-bond geometry to two equivalent K(2), two equivalent Ba(1), and one U(1) atom. In the fourth O site, O(6) is bonded in a distorted linear geometry to two equivalent K(1), two equivalent K(2), one Ca(1), and one U(3) atom. In the fifth O site, O(7) is bonded in a distorted single-bond geometry to two equivalent K(2), two equivalent Ba(1), and one U(2) atom. In the sixth O site, O(1) is bonded in a distorted linear geometry to two equivalent K(1), two equivalent K(2), one U(1), and one U(3) atom. In the seventh O site, O(2) is bonded in a distorted linear geometry to two equivalent K(2), two equivalent Ba(1), one U(1), and one U(2) atom. is represented by the CIF file [CIF]
data_K6Ba2CaU6O24
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.600
_cell_length_b   7.600
_cell_length_c   12.304
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   109.963
_symmetry_Int_Tables_number   1
_cell_volume   667.964
_cell_formula_units_Z   1
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  0.500  0.000  0.000  1.0
  K  K1  1  0.000  0.500  0.000  1.0
  K  K2  1  0.735  0.735  0.258  1.0
  K  K3  1  0.265  0.265  0.742  1.0
  K  K4  1  0.265  0.265  0.258  1.0
  K  K5  1  0.735  0.735  0.742  1.0
  Ba  Ba6  1  0.000  0.500  0.500  1.0
  Ba  Ba7  1  0.500  0.000  0.500  1.0
  Ca  Ca8  1  0.000  0.000  0.000  1.0
  U  U9  1  0.247  0.753  0.245  1.0
  U  U10  1  0.753  0.247  0.755  1.0
  U  U11  1  0.000  0.000  0.500  1.0
  U  U12  1  0.500  0.500  0.000  1.0
  U  U13  1  0.753  0.247  0.245  1.0
  U  U14  1  0.247  0.753  0.755  1.0
  O  O15  1  0.375  0.625  0.124  1.0
  O  O16  1  0.870  0.130  0.621  1.0
  O  O17  1  0.625  0.375  0.124  1.0
  O  O18  1  0.130  0.870  0.621  1.0
  O  O19  1  0.000  0.500  0.255  1.0
  O  O20  1  0.500  0.000  0.745  1.0
  O  O21  1  0.870  0.130  0.379  1.0
  O  O22  1  0.375  0.625  0.876  1.0
  O  O23  1  0.130  0.870  0.379  1.0
  O  O24  1  0.625  0.375  0.876  1.0
  O  O25  1  0.500  0.000  0.255  1.0
  O  O26  1  0.000  0.500  0.745  1.0
  O  O27  1  0.864  0.136  0.134  1.0
  O  O28  1  0.350  0.650  0.638  1.0
  O  O29  1  0.350  0.650  0.362  1.0
  O  O30  1  0.864  0.136  0.866  1.0
  O  O31  1  0.725  0.725  0.000  1.0
  O  O32  1  0.219  0.219  0.500  1.0
  O  O33  1  0.650  0.350  0.362  1.0
  O  O34  1  0.136  0.864  0.866  1.0
  O  O35  1  0.136  0.864  0.134  1.0
  O  O36  1  0.650  0.350  0.638  1.0
  O  O37  1  0.781  0.781  0.500  1.0
  O  O38  1  0.275  0.275  0.000  1.0
[/CIF]
.