#------------------------------------------------------------------------------
#$Date: 2013-03-28 16:17:04 +0000 (Thu, 28 Mar 2013) $
#$Revision: 77586 $
#$URL: svn://www.crystallography.net/cod/cif/9/00/77/9007740.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/. The original data for this entry
# were provided the American Mineralogist Crystal Structure Database,
# http://rruff.geo.arizona.edu/AMS/amcsd.php
#
# 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_9007740
loop_
_publ_author_name
'Range, K. J.'
'Haase, H.'
_publ_section_title
;
 Na2W2O7(II), a high-pressure phase of disodium ditungstate(VI)
;
_journal_name_full               'Acta Crystallographica, Section C'
_journal_page_first              317
_journal_page_last               318
_journal_volume                  46
_journal_year                    1990
_chemical_formula_structural     Na2W2O7
_chemical_formula_sum            'Na2 O7 W2'
_chemical_name_mineral           Na2W2O7
_space_group_IT_number           36
_symmetry_space_group_name_Hall  'C 2c -2'
_symmetry_space_group_name_H-M   'C m c 21'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_length_a                   3.7777
_cell_length_b                   26.6067
_cell_length_c                   5.4290
_cell_volume                     545.680
_exptl_crystal_density_diffrn    6.399
_[local]_cod_chemical_formula_sum_orig 'W2 Na2 O7'
_cod_database_code               9007740
_amcsd_database_code             AMCSD#0009829
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
1/2+x,1/2+y,z
x,-y,1/2+z
1/2+x,1/2-y,1/2+z
-x,y,z
1/2-x,1/2+y,z
-x,-y,1/2+z
1/2-x,1/2-y,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
W1 0.00000 0.44470 0.10218 0.00405
W2 0.00000 0.34024 0.57450 0.00545
Na1 0.50000 0.55080 0.10470 0.01646
Na2 0.50000 0.28740 0.05230 0.03166
O1 0.00000 0.39360 0.90470 0.03673
O2 0.00000 0.50760 0.34570 0.02406
O3 0.00000 0.40840 0.39420 0.01520
O4 0.50000 0.35170 0.62400 0.02406
O5 0.00000 0.29100 0.78470 0.01773
O6 0.50000 0.45250 0.14830 0.02153
O7 0.00000 0.30590 0.30620 0.02913