data_8100986
_journal_name_full  'Zeitschrift fur Kristallographie - NCS'
_journal_year      2001
_publ_section_title
;
The crystal structure of dicesium lead hexaniobium octadecachloride,
 Cs2PbNb6Cl18
;
loop_
_publ_author_name
  'Gulo, Fakhili'
  'Cordier, S.'
  'Perrin, C.'
_chemical_formula_structural  'Cs2 Pb Nb6 Cl18'
_chemical_formula_sum  'Cl18 Cs2 Nb6 Pb'
_chemical_formula_weight  1668.57
_symmetry_cell_setting  'hexagonal'
_symmetry_space_group_name_H-M  'R -3'
loop_
_symmetry_equiv_pos_as_xyz
 'x, y, z'
 '-y, x-y, z'
 '-x+y, -x, z'
 'x+2/3, y+1/3, z+1/3'
 '-y+2/3, x-y+1/3, z+1/3'
 '-x+y+2/3, -x+1/3, z+1/3'
 'x+1/3, y+2/3, z+2/3'
 '-y+1/3, x-y+2/3, z+2/3'
 '-x+y+1/3, -x+2/3, z+2/3'
 '-x, -y, -z'
 'y, -x+y, -z'
 'x-y, x, -z'
 '-x+2/3, -y+1/3, -z+1/3'
 'y+2/3, -x+y+1/3, -z+1/3'
 'x-y+2/3, x+1/3, -z+1/3'
 '-x+1/3, -y+2/3, -z+2/3'
 'y+1/3, -x+y+2/3, -z+2/3'
 'x-y+1/3, x+2/3, -z+2/3'
_cell_length_a  9.4710(10)
_cell_length_b  9.4710(10)
_cell_length_c  26.2360(10)
_cell_angle_alpha  90.00
_cell_angle_beta  90.00
_cell_angle_gamma  120.00
_cell_volume  2038.1(3)
_cell_formula_units_Z  3
_cell_measurement_temperature  293(2)
_exptl_crystal_density_diffrn  4.078
_diffrn_ambient_temperature  293(2)
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
_atom_site_adp_type
_atom_site_occupancy
_atom_site_calc_flag
_atom_site_refinement_flags
_atom_site_disorder_assembly
_atom_site_disorder_group
Pb Pb 0.0000 0.0000 0.0000 0.01457(8) Uani 1 d S . .
Nb Nb 0.29797(3) 0.47242(3) 0.121126(10) 0.01016(8) Uani 1 d . . .
Cs Cs 0.6667 0.3333 0.056284(16) 0.02321(10) Uani 1 d S . .
Cl1 Cl 0.06354(10) 0.25406(9) 0.16613(3) 0.01657(15) Uani 1 d . . .
Cl2 Cl 0.10529(10) 0.47977(10) 0.05956(3) 0.01595(14) Uani 1 d . . .
Cl3 Cl 0.26079(11) 0.23321(11) 0.06351(3) 0.02063(16) Uani 1 d . . .
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_23
_atom_site_aniso_U_13
_atom_site_aniso_U_12
Pb 0.01462(10) 0.01462(10) 0.01446(13) 0.000 0.000 0.00731(5)
Nb 0.01091(12) 0.01022(12) 0.00932(12) -0.00090(8) -0.00024(8) 0.00527(9)
Cs 0.02288(13) 0.02288(13) 0.02387(19) 0.000 0.000 0.01144(7)
Cl1 0.0171(3) 0.0109(3) 0.0166(3) -0.0008(2) 0.0029(2) 0.0031(3)
Cl2 0.0174(3) 0.0177(3) 0.0137(3) -0.0043(2) -0.0047(2) 0.0095(3)
Cl3 0.0200(4) 0.0187(4) 0.0227(4) -0.0089(3) -0.0033(3) 0.0094(3)
loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_distance
_geom_bond_site_symmetry_2
_geom_bond_publ_flag
Pb Cl3 2.8810(9) 10 ?
Pb Cl3 2.8810(9) . ?
Pb Cl3 2.8810(9) 3 ?
Pb Cl3 2.8810(9) 12 ?
Pb Cl3 2.8810(9) 11 ?
Pb Cl3 2.8810(9) 2 ?
Nb Cl1 2.4513(8) . ?
Nb Cl1 2.4554(8) 15 ?
Nb Cl2 2.4639(8) . ?
Nb Cl2 2.4678(8) 2_665 ?
Nb Cl3 2.5969(9) . ?
Nb Nb 2.9310(5) 15 ?
Nb Nb 2.9311(5) 14_455 ?
Nb Nb 2.9396(6) 2_665 ?
Nb Nb 2.9396(6) 3_565 ?
Cs Cl3 3.4738(10) 2_655 ?
Cs Cl3 3.4738(10) 3_665 ?
Cs Cl3 3.4738(10) . ?
Cs Cl1 3.6295(9) 13 ?
Cs Cl1 3.6295(9) 14 ?
Cs Cl1 3.6295(9) 15 ?
Cs Cl2 3.6349(9) 12_655 ?
Cs Cl2 3.6349(9) 10_665 ?
Cs Cl2 3.6349(9) 11 ?
Cs Cl2 3.6643(9) 1_655 ?
Cs Cl2 3.6643(9) 3 ?
Cs Cl2 3.6643(9) 2_665 ?
Cl1 Nb 2.4555(8) 14_455 ?
Cl1 Cs 3.6295(9) 13 ?
Cl2 Nb 2.4678(8) 3_565 ?
Cl2 Cs 3.6348(9) 10_665 ?
Cl2 Cs 3.6643(9) 1_455 ?