The crystal structure described by Tc6BiO18 crystallizes in the monoclinic C2/c space group. There are four inequivalent Tc sites. In the first Tc site, Tc(1) is bonded to two equivalent O(10), two equivalent O(3), and two equivalent O(8) atoms to form corner-sharing TcO6 octahedra. The corner-sharing octahedral tilt angles range from 35-38°. In the second Tc site, Tc(2) is bonded to two equivalent O(10), two equivalent O(2), and two equivalent O(9) atoms to form corner-sharing TcO6 octahedra. The corner-sharing octahedral tilt angles range from 35-51°. In the third Tc site, Tc(3) is bonded to one O(2), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form corner-sharing TcO6 octahedra. The corner-sharing octahedral tilt angles range from 30-54°. In the fourth Tc site, Tc(4) is bonded to one O(1), one O(3), one O(4), one O(5), one O(6), and one O(9) atom to form corner-sharing TcO6 octahedra. The corner-sharing octahedral tilt angles range from 30-54°. Bi(1) is bonded in a hexagonal planar geometry to two equivalent O(2), two equivalent O(6), and two equivalent O(9) atoms. There are ten inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to one Tc(3) and one Tc(4) atom. In the second O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Tc(3), one Tc(4), and one Bi(1) atom. In the third O site, O(7) is bonded in a bent 150 degrees geometry to two equivalent Tc(3) atoms. In the fourth O site, O(8) is bonded in a bent 150 degrees geometry to one Tc(1) and one Tc(3) atom. In the fifth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Tc(2), one Tc(4), and one Bi(1) atom. In the sixth O site, O(10) is bonded in a bent 150 degrees geometry to one Tc(1) and one Tc(2) atom. In the seventh O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Tc(4) atoms. In the eighth O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Tc(2), one Tc(3), and one Bi(1) atom. In the ninth O site, O(3) is bonded in a bent 150 degrees geometry to one Tc(1) and one Tc(4) atom. In the tenth O site, O(4) is bonded in a bent 150 degrees geometry to one Tc(3) and one Tc(4) atom. is represented by the CIF card [CIF]
data_Tc6BiO18
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.239
_cell_length_b   7.239
_cell_length_c   16.180
_cell_angle_alpha   77.136
_cell_angle_beta   77.136
_cell_angle_gamma   89.944
_symmetry_Int_Tables_number   1
_cell_volume   804.872
_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
  Tc  Tc0  1  0.000  0.500  0.000  1.0
  Tc  Tc1  1  0.500  0.500  0.000  1.0
  Tc  Tc2  1  0.164  0.165  0.668  1.0
  Tc  Tc3  1  0.835  0.335  0.834  1.0
  Tc  Tc4  1  0.836  0.835  0.332  1.0
  Tc  Tc5  1  0.665  0.165  0.666  1.0
  Tc  Tc6  1  0.500  0.500  0.500  1.0
  Tc  Tc7  1  0.500  0.000  0.500  1.0
  Tc  Tc8  1  0.335  0.835  0.334  1.0
  Tc  Tc9  1  0.165  0.164  0.168  1.0
  Tc  Tc10  1  0.165  0.665  0.166  1.0
  Tc  Tc11  1  0.835  0.836  0.832  1.0
  Bi  Bi12  1  0.000  0.500  0.500  1.0
  Bi  Bi13  1  0.500  0.000  0.000  1.0
  O  O14  1  0.701  0.299  0.750  1.0
  O  O15  1  0.250  0.412  0.579  1.0
  O  O16  1  0.353  0.974  0.418  1.0
  O  O17  1  0.053  0.303  0.749  1.0
  O  O18  1  0.154  0.401  0.199  1.0
  O  O19  1  0.948  0.201  0.607  1.0
  O  O20  1  0.946  0.054  0.250  1.0
  O  O21  1  0.027  0.278  0.081  1.0
  O  O22  1  0.026  0.647  0.082  1.0
  O  O23  1  0.722  0.973  0.419  1.0
  O  O24  1  0.672  0.412  0.581  1.0
  O  O25  1  0.520  0.276  0.463  1.0
  O  O26  1  0.600  0.846  0.301  1.0
  O  O27  1  0.724  0.480  0.037  1.0
  O  O28  1  0.799  0.052  0.893  1.0
  O  O29  1  0.588  0.328  0.919  1.0
  O  O30  1  0.588  0.750  0.921  1.0
  O  O31  1  0.697  0.947  0.751  1.0
  O  O32  1  0.412  0.672  0.081  1.0
  O  O33  1  0.303  0.053  0.249  1.0
  O  O34  1  0.412  0.250  0.079  1.0
  O  O35  1  0.201  0.948  0.107  1.0
  O  O36  1  0.401  0.154  0.699  1.0
  O  O37  1  0.480  0.724  0.537  1.0
  O  O38  1  0.276  0.520  0.963  1.0
  O  O39  1  0.278  0.027  0.581  1.0
  O  O40  1  0.328  0.588  0.419  1.0
  O  O41  1  0.054  0.946  0.750  1.0
  O  O42  1  0.974  0.353  0.918  1.0
  O  O43  1  0.973  0.722  0.919  1.0
  O  O44  1  0.846  0.600  0.801  1.0
  O  O45  1  0.052  0.799  0.393  1.0
  O  O46  1  0.947  0.697  0.251  1.0
  O  O47  1  0.750  0.588  0.421  1.0
  O  O48  1  0.647  0.026  0.582  1.0
  O  O49  1  0.299  0.701  0.250  1.0
[/CIF]
.
The crystal structure described by Tc6BiO18 crystallizes in the monoclinic C2/c space group. There are four inequivalent Tc sites. In the first Tc site, Tc(1) is bonded to two equivalent O(10), two equivalent O(3), and two equivalent O(8) atoms to form corner-sharing TcO6 octahedra. The corner-sharing octahedral tilt angles range from 35-38°. In the second Tc site, Tc(2) is bonded to two equivalent O(10), two equivalent O(2), and two equivalent O(9) atoms to form corner-sharing TcO6 octahedra. The corner-sharing octahedral tilt angles range from 35-51°. In the third Tc site, Tc(3) is bonded to one O(2), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form corner-sharing TcO6 octahedra. The corner-sharing octahedral tilt angles range from 30-54°. In the fourth Tc site, Tc(4) is bonded to one O(1), one O(3), one O(4), one O(5), one O(6), and one O(9) atom to form corner-sharing TcO6 octahedra. The corner-sharing octahedral tilt angles range from 30-54°. Bi(1) is bonded in a hexagonal planar geometry to two equivalent O(2), two equivalent O(6), and two equivalent O(9) atoms. There are ten inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to one Tc(3) and one Tc(4) atom. In the second O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Tc(3), one Tc(4), and one Bi(1) atom. In the third O site, O(7) is bonded in a bent 150 degrees geometry to two equivalent Tc(3) atoms. In the fourth O site, O(8) is bonded in a bent 150 degrees geometry to one Tc(1) and one Tc(3) atom. In the fifth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Tc(2), one Tc(4), and one Bi(1) atom. In the sixth O site, O(10) is bonded in a bent 150 degrees geometry to one Tc(1) and one Tc(2) atom. In the seventh O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Tc(4) atoms. In the eighth O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Tc(2), one Tc(3), and one Bi(1) atom. In the ninth O site, O(3) is bonded in a bent 150 degrees geometry to one Tc(1) and one Tc(4) atom. In the tenth O site, O(4) is bonded in a bent 150 degrees geometry to one Tc(3) and one Tc(4) atom. is represented by the CIF card [CIF]
data_Tc6BiO18
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.239
_cell_length_b   7.239
_cell_length_c   16.180
_cell_angle_alpha   77.136
_cell_angle_beta   77.136
_cell_angle_gamma   89.944
_symmetry_Int_Tables_number   1
_cell_volume   804.872
_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
  Tc  Tc0  1  0.000  0.500  0.000  1.0
  Tc  Tc1  1  0.500  0.500  0.000  1.0
  Tc  Tc2  1  0.164  0.165  0.668  1.0
  Tc  Tc3  1  0.835  0.335  0.834  1.0
  Tc  Tc4  1  0.836  0.835  0.332  1.0
  Tc  Tc5  1  0.665  0.165  0.666  1.0
  Tc  Tc6  1  0.500  0.500  0.500  1.0
  Tc  Tc7  1  0.500  0.000  0.500  1.0
  Tc  Tc8  1  0.335  0.835  0.334  1.0
  Tc  Tc9  1  0.165  0.164  0.168  1.0
  Tc  Tc10  1  0.165  0.665  0.166  1.0
  Tc  Tc11  1  0.835  0.836  0.832  1.0
  Bi  Bi12  1  0.000  0.500  0.500  1.0
  Bi  Bi13  1  0.500  0.000  0.000  1.0
  O  O14  1  0.701  0.299  0.750  1.0
  O  O15  1  0.250  0.412  0.579  1.0
  O  O16  1  0.353  0.974  0.418  1.0
  O  O17  1  0.053  0.303  0.749  1.0
  O  O18  1  0.154  0.401  0.199  1.0
  O  O19  1  0.948  0.201  0.607  1.0
  O  O20  1  0.946  0.054  0.250  1.0
  O  O21  1  0.027  0.278  0.081  1.0
  O  O22  1  0.026  0.647  0.082  1.0
  O  O23  1  0.722  0.973  0.419  1.0
  O  O24  1  0.672  0.412  0.581  1.0
  O  O25  1  0.520  0.276  0.463  1.0
  O  O26  1  0.600  0.846  0.301  1.0
  O  O27  1  0.724  0.480  0.037  1.0
  O  O28  1  0.799  0.052  0.893  1.0
  O  O29  1  0.588  0.328  0.919  1.0
  O  O30  1  0.588  0.750  0.921  1.0
  O  O31  1  0.697  0.947  0.751  1.0
  O  O32  1  0.412  0.672  0.081  1.0
  O  O33  1  0.303  0.053  0.249  1.0
  O  O34  1  0.412  0.250  0.079  1.0
  O  O35  1  0.201  0.948  0.107  1.0
  O  O36  1  0.401  0.154  0.699  1.0
  O  O37  1  0.480  0.724  0.537  1.0
  O  O38  1  0.276  0.520  0.963  1.0
  O  O39  1  0.278  0.027  0.581  1.0
  O  O40  1  0.328  0.588  0.419  1.0
  O  O41  1  0.054  0.946  0.750  1.0
  O  O42  1  0.974  0.353  0.918  1.0
  O  O43  1  0.973  0.722  0.919  1.0
  O  O44  1  0.846  0.600  0.801  1.0
  O  O45  1  0.052  0.799  0.393  1.0
  O  O46  1  0.947  0.697  0.251  1.0
  O  O47  1  0.750  0.588  0.421  1.0
  O  O48  1  0.647  0.026  0.582  1.0
  O  O49  1  0.299  0.701  0.250  1.0
[/CIF]
.