data_global
_amcsd_formula_title 'K2 Na1.73 Nb8 O34 P5'
loop_
_publ_author_name
'Benabbas A'
'Borel M'
'Grandin A'
'Chardon J'
'Leclaire A'
'Raveau B'
_journal_name_full 'Journal of Solid State Chemistry'
_journal_volume 91 
_journal_year 1991
_journal_page_first 323
_journal_page_last 330
_publ_section_title
;
 The niobium phosphate bronze beta-K2Na2-xNb8P5O34, second
 form of the first member of the series (K3Nb6P4O26)nKNb2PO8
 _cod_database_code 1001478
;
_database_code_amcsd 0013709
_chemical_formula_sum 'Nb8 P5 O34 Na1.73 K2'
_cell_length_a 10.612
_cell_length_b 10.612
_cell_length_c 6.384
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 718.931
_exptl_crystal_density_diffrn      3.603
_symmetry_space_group_name_H-M 'P -4 m 2'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'y,x,-z'
  'y,-x,-z'
  'x,-y,z'
  '-x,-y,z'
  '-y,-x,-z'
  '-y,x,-z'
  '-x,y,z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Nb1   0.50000   0.18295   0.20093   1.00000
Nb2   0.17682   0.17682   0.00000   1.00000
P1   0.50000   0.50000   0.00000   1.00000
P2   0.24040   0.24040   0.50000   1.00000
O1   0.50000   0.00000   0.25600   1.00000
O2   0.36490   0.17530   0.02000   1.00000
O3   0.37930   0.21550   0.45480   1.00000
O4   0.50000   0.38410   0.15100   1.00000
O5   0.17760   0.00000   0.03400   1.00000
O6   0.15920   0.19780   0.31140   1.00000
Na1   0.50000   0.50000   0.50000   0.73000
K1   0.00000   0.00000   0.50000   1.00000
K2   0.00000   0.50000   0.29650   0.50000
Na2   0.00000   0.50000   0.29650   0.50000