#------------------------------------------------------------------------------
#$Date: 2015-01-27 20:58:39 +0100 (Tue 27 de Jan de 2015) $
#$Revision: 130149 $
#$URL: svn://www.crystallography.net/cod/cif/1/00/18/1001860.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/
#
# All data on this site have been placed in the public domain by the
# contributors.
#
data_1001860
loop_
_publ_author_name
'Benabbas, A'
'Borel, M M'
'Grandin, A'
'Leclaire, A'
'Raveau, B'
_publ_section_title              'Single-crystal structure of K3 Nb8 O21'
_journal_coden_ASTM              ACSCEE
_journal_name_full               'Acta Crystallographica C (39,1983-)'
_journal_page_first              439
_journal_page_last               441
_journal_volume                  49
_journal_year                    1993
_chemical_formula_structural     'K3 (Nb8 O21)'
_chemical_formula_sum            'K3 Nb8 O21'
_chemical_name_systematic        'Tripotassium tecto-octaniobate'
_space_group_IT_number           193
_symmetry_cell_setting           hexagonal
_symmetry_Int_Tables_number      193
_symmetry_space_group_name_Hall  '-P 6c 2'
_symmetry_space_group_name_H-M   'P 63/m c m'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            2
_cell_length_a                   9.1584(5)
_cell_length_b                   9.1584(5)
_cell_length_c                   12.0404(4)
_cell_volume                     874.6
_refine_ls_R_factor_all          0.044
_cod_database_code               1001860
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
-y,x-y,z
y-x,-x,z
y,x,z
x-y,-y,z
-x,y-x,z
-x,-y,-z
y,y-x,-z
x-y,x,-z
-y,-x,-z
y-x,y,-z
x,x-y,-z
-x,-y,1/2+z
y,y-x,1/2+z
x-y,x,1/2+z
-y,-x,1/2+z
y-x,y,1/2+z
x,x-y,1/2+z
x,y,1/2-z
-y,x-y,1/2-z
y-x,-x,1/2-z
y,x,1/2-z
x-y,-y,1/2-z
-x,y-x,1/2-z
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_symmetry_multiplicity
_atom_site_Wyckoff_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_attached_hydrogens
_atom_site_calc_flag
Nb1 Nb5+ 4 d 0.6667 0.3333 0. 1. 0 d
Nb2 Nb5+ 12 k 0.24888(3) 0.24888(3) 0.09468(2) 1. 0 d
K1 K1+ 6 g 0.5938(1) 0.5938(1) 0.25 1. 0 d
O1 O2- 24 l 0.4818(2) 0.3143(2) 0.0958(2) 1. 0 d
O2 O2- 12 k 0.2006(3) 0. 0.0740(2) 1. 0 d
O3 O2- 6 g 0.2070(4) 0.2070(4) 0.25 1. 0 d
loop_
_atom_type_symbol
_atom_type_oxidation_number
Nb5+ 4.875
K1+ 1.000
O2- -2.000
