#------------------------------------------------------------------------------
#$Date: 2011-09-28 17:24:46 +0300 (Wed, 28 Sep 2011) $
#$Revision: 26848 $
#$URL: file:///home/coder/svn-repositories/cod/cif/2/00/07/2000777.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_2000777
loop_
_publ_author_name
'Janczak, J.'
'Kubiak, R.'
_publ_section_title
;
 Refinement of the structure of barium copper silicate BaCu[Si~4~O~10~]
 at 300 K
;
_journal_issue                   7
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              1299
_journal_page_last               1301
_journal_volume                  48
_journal_year                    1992
_chemical_formula_sum            'Ba Cu O10 Si4'
_[local]_cod_chemical_formula_sum_orig 'Ba1 Cu1 O10 Si4'
_chemical_formula_weight         473.2
_space_group_IT_number           130
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'P 4ab 2n -1ab'
_symmetry_space_group_name_H-M   'P 4/n c c :1'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.4470(10)
_cell_length_b                   7.4470(10)
_cell_length_c                   16.138(2)
_cell_volume                     895.0(2)
_diffrn_radiation_type           Mo
_diffrn_radiation_wavelength     0.71073
_exptl_absorpt_coefficient_mu    7.198
_exptl_crystal_density_diffrn    3.512
_exptl_crystal_F_000             884
_[local]_cod_data_source_file    ab0258.cif
_[local]_cod_data_source_block   ab0258a
_[local]_cod_depositor_comments
;

Had to add explicit symmetry operators from the CCP4 library to force
origin choice 1.

Saulius Gra\<zulis
;
_[local]_cod_cif_authors_sg_H-M  'P 4/n c c {origin @ -4/n c n}'
_[local]_cod_cif_authors_sg_Hall 'P -4 2 -1n'
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
-x,-y,z
1/2-y,1/2+x,z
1/2+y,1/2-x,z
1/2-x,1/2+y,1/2-z
1/2+x,1/2-y,1/2-z
y,x,1/2-z
-y,-x,1/2-z
1/2-x,1/2-y,-z
1/2+x,1/2+y,-z
y,-x,-z
-y,x,-z
x,-y,1/2+z
-x,y,1/2+z
1/2-y,1/2-x,1/2+z
1/2+y,1/2+x,1/2+z
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Ba .0 .0 .0 .01000(10)
Cu .0 .5 .09440(10) .0077(3)
Si .26810(10) .18870(10) .15460(10) .0073(4)
O(1) .2261(5) .2261(5) .25 .0310(8)
O(2) .4736(4) .2484(5) .1366(2) .0160(7)
O(3) .1367(4) .2818(4) .0908(2) .0157(7)
loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_distance
Si O(1) 1.5950(10)
Si O(2) 1.633(3)
Si O(3) 1.581(3)
Cu O(3) 1.918(3)
Ba O(3) 2.755(3)
Ba O(2) 2.900(3)
_cod_database_code 2000777