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#$Date: 2013-05-09 16:53:25 +0300 (Thu, 09 May 2013) $
#$Revision: 86000 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/01/46/9014634.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_9014634
loop_
_publ_author_name
'Crosnier, M.'
'Guyomard, D.'
'Verbaere, A.'
'Piffard, Y.'
'Tournoux, M.'
_publ_section_title
;
 The potassium niobyl cyclotetrasilicate K2(NbO)2Si4O12
 _cod_database_code 1000339
;
_journal_name_full               'Journal of Solid State Chemistry'
_journal_page_first              128
_journal_page_last               132
_journal_volume                  98
_journal_year                    1992
_chemical_formula_sum            'K Nb O7 Si2'
_space_group_IT_number           100
_symmetry_space_group_name_Hall  'P 4 -2ab'
_symmetry_space_group_name_H-M   'P 4 b m'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_length_a                   8.7404
_cell_length_b                   8.7404
_cell_length_c                   8.136
_cell_volume                     621.546
_database_code_amcsd             0013735
_exptl_crystal_density_diffrn    3.208
_[local]_cod_chemical_formula_sum_orig 'Nb K Si2 O7'
_cod_database_code               9014634
_amcsd_formula_title             'K2 Nb2 O14 Si4'
loop_
_space_group_symop_operation_xyz
x,y,z
1/2-y,1/2-x,z
-y,x,z
1/2+x,1/2-y,z
-x,-y,z
1/2+y,1/2+x,z
y,-x,z
1/2-x,1/2+y,z
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Nb1 0.00710 0.00710 0.00790 0.00000 0.00000 0.00000
Nb2 0.00640 0.00640 0.00790 0.00000 0.00000 0.00000
K1 0.01800 0.01800 0.01240 -0.00340 0.00050 0.00050
Si1 0.00760 0.00760 0.00390 0.00070 0.00040 0.00040
Si2 0.00710 0.00710 0.00360 -0.00010 -0.00030 -0.00030
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Nb1 0.00000 0.00000 0.21600
Nb2 0.00000 0.00000 0.71940
K1 0.32260 0.82260 0.99190
Si1 0.12420 0.62420 0.30150
Si2 0.12400 0.62400 0.69380
O1 0.42510 0.28820 0.23300
O2 0.42190 0.28920 0.76540
O3 0.00000 0.00000 0.00000
O4 0.00000 0.00000 0.50100
O5 0.12000 0.62000 0.49680
O6 0.50000 0.00000 0.22800
O7 0.50000 0.00000 0.76280