#------------------------------------------------------------------------------
#$Date: 2009-11-18 16:56:34 +0200 (Wed, 18 Nov 2009) $
#$Revision: 858 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/9004254.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_9004254
loop_
_publ_author_name
'Ercit T S'
'Hawthorne F C'
'Cerny P'
_publ_section_title
;
 The crystal structure of alumotantite: Its relation to
 the structures of simpsonite and the (Al,Ga)(Ta,Nb)O4 compounds
;
_journal_name_full               'The Canadian Mineralogist'
_journal_page_first              653
_journal_page_last               662
_journal_volume                  30
_journal_year                    1992
_chemical_formula_sum            'Al O4 Ta'
_[local]_cod_chemical_formula_sum_orig 'Ta Al O4'
_chemical_name_mineral           Alumotantite
_symmetry_space_group_name_H-M   'P b c n'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_length_a                   4.473
_cell_length_b                   11.308
_cell_length_c                   4.775
_cell_volume                     241.523
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
x,-y,1/2+z
-x,y,1/2-z
1/2-x,1/2+y,z
1/2+x,1/2-y,-z
1/2+x,1/2+y,1/2-z
1/2-x,1/2-y,1/2+z
-x,-y,-z
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Ta 0.00000 0.16817 0.25000 ?
Al 0.00000 0.43460 0.25000 0.00557
O1 0.22200 0.31200 0.08600 ?
O2 0.26600 0.05800 0.07300 ?
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
Ta 0.00628 0.00259 0.00635 0.00000 -0.00022 0.00000
O1 0.00456 0.00842 0.00728 -0.00205 -0.00032 -0.00055
O2 0.01338 0.00130 0.01040 0.00000 -0.01060 0.00000