#------------------------------------------------------------------------------
#$Date: 2024-04-25 17:59:02 +0300 (Thu, 25 Apr 2024) $
#$Revision: 291351 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/00/45/9004540.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/. The original data for this entry
# were provided the American Mineralogist Crystal Structure Database,
# http://rruff.geo.arizona.edu/AMS/amcsd.php
#
# The file may be used within the scientific community so long as
# proper attribution is given to the journal article from which the
# data were obtained.
#
data_9004540
loop_
_publ_author_name
'Cooper, M. A.'
'Hawthorne, F. C.'
'Cerny, P.'
_publ_section_title
;
 Ta-Nb order in the crystal structure of niobium-rich calciotantite
;
_journal_name_full               'The Canadian Mineralogist'
_journal_page_first              1289
_journal_page_last               1294
_journal_volume                  37
_journal_year                    1999
_chemical_formula_sum            'Ca Nb1.179 O11 Ta2.821'
_chemical_name_mineral           Calciotantite
_space_group_IT_number           182
_symmetry_space_group_name_Hall  'P 6c 2c'
_symmetry_space_group_name_H-M   'P 63 2 2'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_length_a                   6.2261
_cell_length_b                   6.2261
_cell_length_c                   12.280
_cell_formula_units_Z            2
_cell_volume                     412.250
_database_code_amcsd             0005632
_exptl_crystal_density_diffrn    6.735
_cod_original_formula_sum        '(Ta2.821 Nb1.179) Ca O11'
_cod_database_code               9004540
loop_
_space_group_symop_operation_xyz
x,y,z
x,x-y,1/2-z
x-y,x,1/2+z
y,x,-z
-y,x-y,z
-x+y,y,1/2-z
-x,-y,1/2+z
-x,-x+y,-z
-x+y,-x,z
-y,-x,1/2-z
y,-x+y,1/2+z
x-y,-y,-z
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Ta1 0.35938 0.35938 0.50000 0.69800 0.00760
Nb1 0.35938 0.35938 0.50000 0.30200 0.00760
Ta2 0.33333 0.66667 0.25000 0.72700 0.00820
Nb2 0.33333 0.66667 0.25000 0.27300 0.00820
Ca 0.66667 0.33333 0.25000 1.00000 0.00650
O1 0.37570 0.43040 0.34400 1.00000 0.00970
O2 0.75320 0.75320 0.50000 1.00000 0.01310
O3 0.33333 0.66667 0.53390 1.00000 0.00920
loop_
_cod_related_entry_id
_cod_related_entry_database
_cod_related_entry_code
1 AMCSD 0005632
