#------------------------------------------------------------------------------
#$Date: 2009-11-18 14:56:34 +0000 (Wed, 18 Nov 2009) $
#$Revision: 858 $
#$URL: svn://www.crystallography.net/cod/cif/2/2101515.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/. The original data for this entry
# were provided by IUCr Journals, http://journals.iucr.org/.
#
# 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_2101515
_space_group_IT_number           26
_symmetry_space_group_name_Hall  'P -2 2a'
_symmetry_space_group_name_H-M   'P 21 a m'
_[local]_cod_cif_authors_sg_H-M  'A 21 a m'
_[local]_cod_cif_authors_sg_Hall 'A -2 2a'
loop_
_publ_author_name
'Srikanth, V.'
'Idink, H.'
'White, W. B.'
'Subbarao, E. C.'
'Rajagopal, H.'
'Sequeira, A.'
_publ_section_title
;
 Cation disorder in ferroelectric PbBi~2~Nb~2~O~9~
;
_journal_issue                   3
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              432
_journal_page_last               439
_journal_volume                  52
_journal_year                    1996
_chemical_formula_sum            'Bi2 Nb2 O9 Pb'
_[local]_cod_chemical_formula_sum_orig 'Bi2 Nb2 O9 Pb1'
_symmetry_cell_setting           orthorhombic
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   5.504(3)
_cell_length_b                   5.487(3)
_cell_length_c                   25.511(5)
_cell_volume                     770.4(6)
_diffrn_radiation_type           neutron
_diffrn_radiation_wavelength     1.216
_[local]_cod_data_source_file    br0024.cif
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
x,+y,-z
1/2+x,-y,-z
1/2+x,-y,+z
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Pb/Bi 0.25 .269(3) 0.50
Bi/Pb .266(5) .742(3) .2013(2)
Nb .278(4) .744(3) .4115(2)
O(1) .309(6) .194(5) 0.0
O(2) .303(3) .275(3) .1593(2)
O(3) .524(6) .498(2) .2473(5)
O(4) .528(4) .027(2) .5715(3)
O(5) .597(4) .5457(18) .5846(3)