data_global
_amcsd_formula_title 'K6 O26 Si4 Ta6'
loop_
_publ_author_name
'Choisnet J'
'Nguyen N'
'Groult D'
'Raveau B'
_journal_name_full 'Materials Research Bulletin'
_journal_volume 11 
_journal_year 1976
_journal_page_first 887
_journal_page_last 894
_publ_section_title
;
 De nouveaux oxydes a reseau forme d'octaedres Nb O6 (Ta O6) et de
 groupes Si2 O7: Les phases A3 Ta6 Si4 O26 (A= Ba, Sr) et
 K6 M6 Si4 O26 (M= Nb, Ta)
 _cod_database_code 1001104
;
_database_code_amcsd 0014249
_chemical_formula_sum 'K3 Ta3 Si2 O13'
_cell_length_a 9.066
_cell_length_b 9.066
_cell_length_c 7.873
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 560.405
_exptl_crystal_density_diffrn      5.478
_symmetry_space_group_name_H-M 'P -6 2 m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-x+y,z'
  '-x+y,-x,-z'
  'y,x,-z'
  '-y,x-y,z'
  'x-y,-y,z'
  'x,y,-z'
  '-x,-x+y,-z'
  '-x+y,-x,z'
  'y,x,z'
  '-y,x-y,-z'
  'x-y,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
K1   0.58600   0.00000   0.50000
K2   0.61000   0.00000   0.00000
Ta1   0.23900   0.00000   0.24900
Si1   0.33333   0.66667   0.20800
O1   0.33333   0.66667   0.00000
O2   0.26200   0.00000   0.00000
O3   0.81100   0.00000   0.26000
O4   0.50000   0.17600   0.28900
O5   0.24200   0.00000   0.50000