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#$Date: 2016-02-13 20:28:24 +0100 (Sat 13 de Feb de 2016) $
#$Revision: 176429 $
#$URL: svn://www.crystallography.net/cod/cif/7/22/12/7221278.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/
#
# All data on this site have been placed in the public domain by the
# contributors.
#
data_7221278
loop_
_publ_author_name
'Crosnier-Lopez, M.P.'
'le Berre, F.'
'Fourquet, J.L.'
_publ_section_title
;
 The layered perovskite K2 Sr Ta2 O7: hydration and K(+)/H(+) ion exchange
;
_journal_name_full               'Journal of Materials Chemistry'
_journal_page_first              1146
_journal_page_last               1151
_journal_volume                  11
_journal_year                    2001
_chemical_formula_sum            'K2 O7 Sr Ta2'
_chemical_name_systematic        'K2 Sr (Ta2 O7)'
_space_group_IT_number           139
_symmetry_space_group_name_Hall  '-I 4 2'
_symmetry_space_group_name_H-M   'I 4/m m m'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   3.9858
_cell_length_b                   3.9858
_cell_length_c                   21.785
_cell_volume                     346.090
_citation_journal_id_ASTM        JMACEP
_cod_data_source_file            Crosnier-Lopez_JMACEP_2001_1392.cif
_cod_data_source_block           K2O7Sr1Ta2
_cod_original_cell_volume        346.0896
_cod_original_formula_sum        'K2 O7 Sr1 Ta2'
_cod_database_code               7221278
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
-y,x,z
-x,-y,z
y,-x,z
x,-y,-z
y,x,-z
-x,y,-z
-y,-x,-z
-x,-y,-z
y,-x,-z
x,y,-z
-y,x,-z
-x,y,z
-y,-x,z
x,-y,z
y,x,z
x+1/2,y+1/2,z+1/2
-y+1/2,x+1/2,z+1/2
-x+1/2,-y+1/2,z+1/2
y+1/2,-x+1/2,z+1/2
x+1/2,-y+1/2,-z+1/2
y+1/2,x+1/2,-z+1/2
-x+1/2,y+1/2,-z+1/2
-y+1/2,-x+1/2,-z+1/2
-x+1/2,-y+1/2,-z+1/2
y+1/2,-x+1/2,-z+1/2
x+1/2,y+1/2,-z+1/2
-y+1/2,x+1/2,-z+1/2
-x+1/2,y+1/2,z+1/2
-y+1/2,-x+1/2,z+1/2
x+1/2,-y+1/2,z+1/2
y+1/2,x+1/2,z+1/2
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Ta1 Ta+5 0 0 0.40372 1 0.0
O2 O-2 0.5 0.5 0.1798 1 0.0
O3 O-2 0 0 0.5 1 0.0
O1 O-2 0.5 0 0.0862 1 0.0
K1 K+1 0 0 0.1934 1 0.0
Sr1 Sr+2 0 0 0 1 0.0
