data_global
_amcsd_formula_title 'Cu Na2 O7 P2'
loop_
_publ_author_name
'Erragh F'
'Boukhari A'
'Abraham F'
'Elouadi B'
_journal_name_full 'Journal of Solid State Chemistry'
_journal_volume 120 
_journal_year 1995
_journal_page_first 23
_journal_page_last 31
_publ_section_title
;
 The crystal structure of alpha- and beta- Na2 Cu P2 O7
 _cod_database_code 1004112
;
_database_code_amcsd 0013876
_chemical_formula_sum 'Cu P2 Na2 O7'
_cell_length_a 8.823
_cell_length_b 13.494
_cell_length_c 5.108
_cell_angle_alpha 90
_cell_angle_beta 92.77
_cell_angle_gamma 90
_cell_volume 607.435
_exptl_crystal_density_diffrn      3.100
_symmetry_space_group_name_H-M 'P 1 21/n 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2-y,1/2+z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Cu1   0.25768   0.15840   0.20512
P1   0.72850   0.46307   0.20705
P2   0.95594   0.31901   0.22880
Na1   0.65170   0.20820   0.23350
Na2   0.13080   0.89020   0.21880
O1   0.91190   0.27560   0.49150
O2   0.86030   0.27410   0.00190
O3   0.67850   0.44700  -0.08080
O4   0.65030   0.38730   0.38160
O5   0.71530   0.56740   0.29450
O6   0.12320   0.31200   0.19250
O7   0.90840   0.43440   0.23440