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#$Date: 2016-02-13 21:28:24 +0200 (Sat, 13 Feb 2016) $
#$Revision: 176429 $
#$URL: svn://www.crystallography.net/cod/cif/1/52/19/1521923.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_1521923
loop_
_publ_author_name
'Shimakawa, Y.'
'Nakagawa, Y.'
'Kubo, Y.'
'Kamiyama, T.'
'Asano, H.'
_publ_section_title
;
 Crystal structures of Sr Bi2 Ta2 O9 and Sr0.8 Bi2.2 Ta2 O9 ferroelectric
 materials
;
_journal_name_full
'Materials Research Society Symposia Proceedings'
_journal_page_first              523
_journal_page_last               528
_journal_volume                  541
_journal_year                    1999
_chemical_formula_sum            'Bi2 O9 Sr Ta2'
_chemical_name_systematic        'Sr Bi2 (Ta2 O9)'
_space_group_IT_number           36
_symmetry_space_group_name_Hall  'A -2 2a'
_symmetry_space_group_name_H-M   'A 21 a m'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   5.52237
_cell_length_b                   5.52408
_cell_length_c                   25.0264
_cell_volume                     763.456
_citation_journal_id_ASTM        MRSPDH
_cod_data_source_file            Shimakawa_MRSPDH_1999_544.cif
_cod_data_source_block           Bi2O9Sr1Ta2
_cod_original_cell_volume        763.4556
_cod_original_sg_symbol_Hall     'C 2c -2 (z,y,-x)'
_cod_original_formula_sum        'Bi2 O9 Sr1 Ta2'
_cod_database_code               1521923
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
x+1/2,-y,-z
x,y,-z
x+1/2,-y,z
x,y+1/2,z+1/2
x+1/2,-y+1/2,-z+1/2
x,y+1/2,-z+1/2
x+1/2,-y+1/2,z+1/2
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
O1 O-2 0.5248 0.2892 0 1 0.0
Ta1 Ta+5 0.5104 0.748 0.41482 1 0.0
O5 O-2 0.7909 0.9807 0.58359 1 0.0
Bi1 Bi+3 0.4634 0.7764 0.19996 1 0.0
Sr1 Sr+2 0 0.2567 0 1 0.0
O3 O-2 0.7381 0.9923 0.25076 1 0.0
O2 O-2 0.5219 0.699 0.34187 1 0.0
O4 O-2 0.7554 0.9867 0.06964 1 0.0
