data_global
_amcsd_formula_title 'Ba3 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'octahedres NbO6 (TaO6) et de groupes Si2O7:
 Les phases A3Ta6Si4O26 (A = Ba,Sr) et K6M6Si4O26 (M = Nb,Ta)
 _cod_database_code 1001102
;
_database_code_amcsd 0014247
_chemical_formula_sum 'Ba3 Ta6 Si4 O26'
_cell_length_a 9.001
_cell_length_b 9.001
_cell_length_c 7.734
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 542.646
_exptl_crystal_density_diffrn      6.200
_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
Ba1   0.59500   0.00000   0.50000
Ta1   0.24200   0.00000   0.23900
Si1   0.33333   0.66667   0.20700
O1   0.33333   0.66667   0.00000
O2   0.31400   0.00000   0.00000
O3   0.80900   0.00000   0.24200
O4   0.50000   0.17400   0.27900
O5   0.20800   0.00000   0.50000