data_1010050
loop_
_publ_author_name
'Hoard, J L'
_publ_section_title
;
Structures of complex fluorides. Potassium heptafluocolumbate. The
Configuration of the heptafluocolumbate and heptafluortantalate
ions
;
_journal_coden_ASTM              JACSAT
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              1252
_journal_page_last               1259
_journal_volume                  61
_journal_year                    1939
_chemical_formula_structural     'K2 Ta F7'
_chemical_formula_sum            'F7 K2 Ta'
_chemical_name_systematic        'Potassium heptafluorotantalate'
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_cell_angle_alpha                90
_cell_angle_beta                 90.(0)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   5.85
_cell_length_b                   12.67
_cell_length_c                   8.5
_cell_volume                     630.016
_cod_original_cell_volume        630.0
_cod_database_code               1010050
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
-x,1/2+y,1/2-z
-x,-y,-z
x,1/2-y,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
Ta1 Ta5+ 4 e 0.266 0.128 0.223 1. 0 d
K1 K1+ 4 e 0.236 0.44 0.188 1. 0 d
K2 K1+ 4 e 0.757 0.28 0.445 1. 0 d
F1 F1- 4 e 0.045 0.245 0.2 1. 0 d
F2 F1- 4 e 0.455 0.255 0.205 1. 0 d
F3 F1- 4 e 0.045 0.105 0.4 1. 0 d
F4 F1- 4 e 0.455 0.11 0.41 1. 0 d
F5 F1- 4 e 0.225 -0.025 0.215 1. 0 d
F6 F1- 4 e 0.18 0.11 0.005 1. 0 d
F7 F1- 4 e 0.55 0.075 0.125 1. 0 d
loop_
_atom_type_symbol
_atom_type_oxidation_number
Ta5+ 5.000
K1+ 1.000
F1- -1.000
