#------------------------------------------------------------------------------
#$Date: 2008-03-10 10:25:41 +0200 (Mon, 10 Mar 2008) $
#$Revision: 255 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/9004540.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_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            '(Ta2.821 Nb1.179) Ca O11'
_chemical_name_mineral           Calciotantite
_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_volume                     412.250
loop_
_symmetry_equiv_pos_as_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_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Ta1 0.00900 0.00900 0.00700 0.00630 -0.00010 0.00010
Nb1 0.00900 0.00900 0.00700 0.00630 -0.00010 0.00010
Ta2 0.00910 0.00910 0.00620 0.00460 0.00000 0.00000
Nb2 0.00910 0.00910 0.00620 0.00460 0.00000 0.00000
Ca 0.00690 0.00690 0.00580 0.00350 0.00000 0.00000
O1 0.00990 0.01210 0.00750 0.00570 0.00100 0.00250
O2 0.01540 0.01540 0.01420 0.01200 0.00060 -0.00060
O3 0.00750 0.00750 0.01270 0.00370 0.00000 0.00000