#------------------------------------------------------------------------------
#$Date: 2008-04-05 09:13:02 +0100 (Sat, 05 Apr 2008) $
#$Revision: 340 $
#$URL: svn://www.crystallography.net/cod/cif/2/2101514.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_2101514
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 Pb1'
_symmetry_cell_setting           orthorhombic
_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                   5.503(4)
_cell_length_b                   5.495(4)
_cell_length_c                   25.531(5)
_cell_volume                     772.0(8)
_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 0.269(3) .50
Bi/Pb 0.265(7) .746(3) .2010(2)
Nb 0.280(5) 0.748(3) 0.4114(2)
O(1) 0.321(7) 0.205(6) 0.0
O(2) 0.305(4) 0.282(4) 0.1592(2)
O(3) 0.531(6) 0.498(2) 0.2467(5)
O(4) 0.524(6) 0.0314(19) 0.5723(3)
O(5) 0.591(6) 0.548(2) 0.5833(3)