data_global
_amcsd_formula_title 'O21 Sr3 Ta4 Ti4'
loop_
_publ_author_name
'Saurel C'
'Groult D'
'Raveau B'
_journal_name_full 'Materials Research Bulletin'
_journal_volume 12 
_journal_year 1977
_journal_page_first 629
_journal_page_last 635
_publ_section_title
;
 Etude du comportement de l'antimoine V et du strontium dans les oxydes
 a structure en cages du type A3 M8 O21
 _cod_database_code 1001279
;
_database_code_amcsd 0014259
_chemical_formula_sum 'Sr3 Ti4 Ta4 O21'
_cell_length_a 9.008
_cell_length_b 9.008
_cell_length_c 11.629
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 817.203
_exptl_crystal_density_diffrn      6.153
_symmetry_space_group_name_H-M 'P 63/m c m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-x+y,z'
  'x,x-y,-z'
  '-x+y,-x,1/2-z'
  'x-y,x,1/2+z'
  '-y,-x,1/2+z'
  'y,x,1/2-z'
  'y,-x+y,-z'
  '-y,x-y,z'
  'x-y,-y,z'
  '-x+y,y,-z'
  'x,y,1/2-z'
  '-x,-y,1/2+z'
  'x,x-y,1/2+z'
  '-x,-x+y,1/2-z'
  'x-y,x,-z'
  '-x+y,-x,z'
  'y,x,z'
  '-y,-x,-z'
  '-y,x-y,1/2-z'
  'y,-x+y,1/2+z'
  '-x+y,y,1/2+z'
  'x-y,-y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Sr1   0.59700   0.00000   0.25000   1.00000
Ti1   0.24700   0.00000   0.09200   0.66670
Ta1   0.24700   0.00000   0.09200   0.33330
Ta2   0.33333   0.66667   0.00000   1.00000
O1   0.19100   0.00000   0.25000   1.00000
O2   0.79600   0.00000   0.07900   1.00000
O3   0.16667   0.50600   0.11100   1.00000